Sternoclavicular Joint: Difference between revisions

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== Description  ==
== Description  ==


The Sternoclavicular Joint (SC joint) is formed from the articulation of the medial aspect of the clavicle and the manubrium of the sternum.&nbsp; It is one of four joints that compose the Shoulder Complex.&nbsp; The SC joint is generally classified as a plane style synovial joint, and has a fibrocartilage joint disk.<ref>Levangie, P.K. and Norkin, C.C. (2005). Joint structure and function: A comprehensive analysis (4th ed.). Philadelphia: The F.A. Davis Company.</ref>&nbsp; The ligamentous reinforcements of this joint are very strong, often resulting a fracture of the clavicle before a dislocation of the SC Joint.<ref>Allman, F.L. (1967). Fractures and ligamentous injuries of the clavicle and its articulation. J Bone Joint Surg. 49A:774-784.</ref>  
The Sternoclavicular Joint (SC joint) is formed from the articulation of the medial aspect of the clavicle and the manubrium of the sternum.&nbsp;The SC joint is the only true articulation connecting the upper limb to the axial skeleton, and that it’s the least constricted joint in the human body<ref>Van Tongel A, MacDonald P, Leiter J, Pouliart N, Peeler J. A cadaveric study of the structural anatomy of the sternoclavicular joint. Clinical Anatomy. 2012 Oct;25(7):903-10.</ref>. It is one of four joints that compose the [[Shoulder]] Complex.&nbsp; The SC joint is generally classified as a plane style synovial joint and has a fibrocartilage joint disk.<ref name=":1">Levangie, P.K. and Norkin, C.C. Joint structure and function: A comprehensive analysis (4th ed.). Philadelphia: The F.A. Davis Company;2005</ref>&nbsp; The ligamentous reinforcements of this joint are very strong, often resulting in a fracture of the clavicle before a dislocation of the SC joint.<ref>ALLMAN JR FL. Fractures and ligamentous injuries of the clavicle and its articulation. JBJS. 1967 Jun 1;49(4):774-84.</ref>  


== Anatomy<br>  ==
== Anatomy   ==


[[Image:SC Joint.jpg|center|750px]]  
[[Image:SC Joint.jpg|center|750px]]
 
'''The SC joint is formed by the articulation of three bones'''<ref name=":3" />''':'''
* Manubrium, which means handle in Latin. The Manubrium is joined with the sternum.
* The clavicle
* The articulation between the first rib costal cartilage


=== Joint Capsule  ===
=== Joint Capsule  ===


The SC Joint capsule is fairly strong but is dependent on the ligaments noted above for the majority of its support.  
The SC Joint capsule is fairly strong but is dependent on the ligaments for the majority of its support.  


=== Joint Disk&nbsp;  ===
=== Joint Disk&nbsp;  ===
The inter-articular fibrocartilage disc separates the joint into two compartments<ref name=":3">Horsley I. Sternoclavicular joint disorders Course. Plus 2020 </ref><ref>Negri JH, Malavolta EA, Assunção JH, Gracitelli ME, Pereira CA, Neto RB, Croci AT, Neto AF. Assessment of the function and resistance of sternoclavicular ligaments: A biomechanical study in cadavers. Orthopaedics & Traumatology: Surgery & Research. 2014 Nov 1;100(7):727-31.</ref>. The first compartment lies between the manubrium and the disc and the second lies between the disc and the clavicle.


The SC Joint is surprisingly incongruent, and because of this incongruency a joint disk is present to enhance joint curvature and contact of the joint surfaces.&nbsp;Similar to meniscus of the knee, the SC Joint disk increases joint congruence and acts to absorb foces that may be transmitted along the clavicle. The disk is attached to the upper and posterior margin of the the clavicle, and to the cartilage of the first rib, which functions to help prevent medial displacement of the clavicle. This orientation divides the joint into seperate cavities. Greater movement occurs between the disk and the clavicle than between the disk and the manubrium.&nbsp;<ref>Dutton, M. (2008). Orthopaedic: Examination, evaluation, and intervention (2nd ed.). New York: The McGraw-Hill Companies, Inc.</ref><ref>Levangie, P.K. and Norkin, C.C. (2005). Joint structure and function: A comprehensive analysis (4th ed.). Philadelphia: The F.A. Davis Company.</ref>  
The SC Joint is surprisingly incongruent, and because of this incongruency, a joint disk is present to enhance joint curvature and contact of the joint surfaces.&nbsp;Similar to the meniscus of the knee, the SC Joint disk increases joint congruence and acts to absorb forces that may be transmitted along the clavicle. The disk is attached to the upper and posterior margin of the clavicle, and to the cartilage of the first rib, which functions to help prevent medial displacement of the clavicle. Greater movement occurs between the disk and the clavicle than between the disk and the manubrium.&nbsp;<ref name=":1" /><ref name=":0" />  


=== Ligaments&nbsp;  ===
=== Ligaments&nbsp;  ===
{| width="100%" border="1" align="center" cellpadding="1" cellspacing="1"
{| width="100%" border="1" align="center" cellpadding="1" cellspacing="1"
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|-
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! scope="col" width="22" align="center" valign="middle" bgcolor="#999999" | DESCRIPTION  
! scope="col" width="22" align="center" valign="middle" bgcolor="#999999" | DESCRIPTION  
! scope="col" width="22%" align="center" valign="middle" bgcolor="#999999" | PROXIMAL ATTACHMENT
! scope="col" width="22%" align="center" valign="middle" bgcolor="#999999" | ATTACHMENT  
! scope="col" width="22%" align="center" valign="middle" bgcolor="#999999" | DISTAL ATTACHMENT  
! scope="col" width="18%" align="center" valign="middle" bgcolor="#999999" | ROLE
! scope="col" width="18%" align="center" valign="middle" bgcolor="#999999" | ROLE
|-
|-
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Sternoclavicular  
Sternoclavicular  


Ligament&nbsp;<ref name=":0">Dutton, M. (2008). Orthopaedic: Examination, evaluation, and intervention (2nd ed.). New York: The McGraw-Hill Companies, Inc.</ref><ref name=":1">Levangie, P.K. and Norkin, C.C. (2005). Joint structure and function: A comprehensive analysis (4th ed.). Philadelphia: The F.A. Davis Company.</ref> <br>
Ligament&nbsp;<ref name=":0">Dutton M. Orthopaedic: Examination, evaluation, and intervention(2nd edition). New York: The McGraw-Hill Companies, Inc, 2008.</ref><ref name=":1" /><br>  
 
| align="center" |
<br> Broad band of fibers,
 
covering&nbsp;anterior surface of
 
SC Joint
 
r<span style="text-align: left;">unning o</span><span style="text-align: left;">bliquely from </span>
 
<span style="text-align: left;">Proximal Clavicle to Sternum </span>
 
<span style="text-align: left;">in a downward and medial </span>
 
<span style="text-align: left;">direction</span><br>  


| align="center" |  
| align="center" |  
Superior &amp; Anterior Aspect
<br> Broad band of fibers, covering&nbsp;anterior surface of SC Joint r<span style="text-align: left;">unning o</span><span style="text-align: left;">bliquely from </span> <span style="text-align: left;">proximal clavicle to sternum </span> <span style="text-align: left;">in a downward and medial </span> <span style="text-align: left;">direction</span><br>
 
Sternal End Clavicle


| align="center" |  
| align="center" |  
Anterior Superior Aspect  
Superior &amp; Anterior Aspect of 


of Manubrium
Sternal End of the Clavicle to the Anterior Superior Aspect


| align="center" |
of manubrium
<span style="line-height: 1.5em;">Reinforce </span><span style="line-height: 1.5em;">Capsule&nbsp;</span><span style="line-height: 1.5em;">Anteriorly</span>


Limits Anterior Translation of Clavicle
| align="center" |
 
* <span style="line-height: 1.5em;">Reinforces the  c</span><span style="line-height: 1.5em;">apsule&nbsp;a</span><span style="line-height: 1.5em;">nteriorly</span>
Checks Anterior Movement of Head of Clavicle
* Limits anterior translation of the clavicle
* Checks anterior movement of the head of the clavicle


|-
|-
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Sternoclavicular <br>Ligament&nbsp;<ref name=":0" /><ref name=":1" /> <br>
Sternoclavicular <br>Ligament&nbsp;<ref name=":0" /><ref name=":1" /> <br>


| align="center" |  
| align="center" |Broad band of fibers, covering posterior&nbsp;surface of SC Joint
Broad band of fibers,<br>
 
covering posterior&nbsp;surface of<br>
 
SC Joint  


<br>
Weaker than the Anterior Sternoclavicular Ligament.<br>
 
Weaker than the Anterior Sternoclavicular Ligament.<br>  


| align="center" |  
| align="center" |  
Superior &amp; Posterior Aspect  
Superior &amp; Posterior Aspect  


Sternal End Clavicle  
Sternal End Clavicle to Posterior Superior Aspect  
 
| align="center" |
Posterior Superior Aspect  


of Manubrium  
of Manubrium  


| align="center" |  
| align="center" |
<br> Reinforce Capsule&nbsp;Posteriorly  
* Reinforces the  capsule&nbsp;Posteriorly  
 
* <span style="text-align: left;">Limits the posterior translation of the Clavicle</span>
<span style="text-align: left;">Limits Posterior Translation of Clavicle</span>  
* <span style="text-align: left;">Checks the posterior movement of the head of the clavicle</span><br>
 
<span style="text-align: left;">Checks Posterior Movement of Head of Clavicle</span><br>  


|-
|-
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| align="center" |  
| align="center" |  
Anchors Inferior Surface of  
Anchors Inferior Surface of the Sternal End of the Clavicle to the 1st Rib &amp; its Costal Cartilage  
 
Sternal End of Clavicle to 1st  
 
Rib &amp; its Costal Cartilage  


<br>  
<br>  


Orientation allows this  
Orientation allows this ligament to act as the Primary Restraint for the SC Joint


ligament to act as the Primary
| align="center" |Anterior lamina: laterally from first rib to the clavicle


Restraint for the SC Joint
Posterior lamina: medially from first rib to the clavicle<br>


| align="center" |  
| align="center" |
<br>
* Limits the elevation of the pectoral girdle
 
* Acts as a fulcrum for elevation-depression & protraction-retraction
| align="center" |
* <span style="text-align: left;">Checks the clavicular elevation and superior glide of the clavicle</span>
<br>
 
| align="center" |
Limits Elevation of Pectoral Girdle
 
Acts as Fulcrum for Elevation-Depression Protration-Retraction
 
<span style="text-align: left;">Checks Clavicular Elevation and Superior Glide of Clavicle</span>  


|-
|-
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| align="center" |  
| align="center" |  
<span style="line-height: 19.920000076293945px; text-align: left;">Connects Sternal Ends of Each Clavicle with Capsular Ligaments and Upper Manubrium</span>  
<span style="line-height: 19.920000076293945px; text-align: left;">Connects Sternal Ends of Each Clavicle with the Capsular Ligaments and Upper Manubrium</span>  


<span style="line-height: 19.920000076293945px; text-align: left;">Produces a Bilateral Depression Force</span>  
<span style="line-height: 19.920000076293945px; text-align: left;">Produces a Bilateral Depression Force</span>  


| align="center" | Sternal End of One Clavicle
| align="center" | Sternal end of one clavicle to sternal end of the other clavicle.
| align="center" | Sternal End of Other Clavicle
| align="center" |
| align="center" |  
* Strengthens the capsule&nbsp;superiorly
Strengthens Capsule&nbsp;Superiorly
* <span style="text-align: left;">Resists excessive depression or downward glide of the clavicle</span>
 
<span style="text-align: left;">Resists Excessive Depression or Downward Glide of Clavicle</span>  


|}
|}
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=== Muscles  ===
=== Muscles  ===


There are no muscles that act directly on the SC Joint.&nbsp; However, the SC Joint motions closely mimic the reciprical motions of the scapula.&nbsp; In addition, the following muscles have an attachment of the clavicle and therefore may produce movement of the clavicle:&nbsp;  
There are no muscles that act directly on the SC Joint.&nbsp; However, the SC Joint motions closely mimic the reciprocal motions of the scapula.&nbsp; In addition, the following muscles have an attachment of the clavicle and therefore may produce movement of the clavicle:&nbsp;  


*[http://www.rad.washington.edu/academics/academic-sections/msk/muscle-atlas/upper-body/deltoid Deltoid]&nbsp;  
*[http://www.rad.washington.edu/academics/academic-sections/msk/muscle-atlas/upper-body/deltoid Deltoid]&nbsp;  
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*[http://www.rad.washington.edu/academics/academic-sections/msk/muscle-atlas/upper-body/trapezius Trapezius]  
*[http://www.rad.washington.edu/academics/academic-sections/msk/muscle-atlas/upper-body/trapezius Trapezius]  
*[[Sternocleidomastoid|Sternocleidomastoid]]
*[[Sternocleidomastoid|Sternocleidomastoid]]
*Subclavius muscle
*[https://physio-pedia.com/Scalene Scalene muscles] 


== Function  ==
== Function  ==
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=== Motions Available &amp; Range of Movement  ===
=== Motions Available &amp; Range of Movement  ===


The SC Joint has 3 Degress of Movement  
The SC Joint has 3 Degrees of Movement<ref>Ludewig PM, Phadke V, Braman JP, et al: Motion of the shoulder complex during multiplayer humeral elevation. ''J Bone Joint Surg Am'' 91:378-389, 2009.</ref>:
* Sagittal Plane: Anterior & Posterior Rotations
* Frontal Plane: Elevation & Depression
* Transverse Plane: Protraction & Retraction
{{#ev:youtube|HDMbbRlLQXw}}


==== Elevation and Depression '''&nbsp;====
==== Elevation and Depression '''&nbsp;'''====
During elevation, the clavicle rotates upward on the manubrium, and produces and inferior glide to maintain joint contact. The reverse actions happen when the clavicle is depressed. The motions are usually associated with elevation and depression of the scapula.<ref>Brody, L.T.:Shoulder. In: Wadsworth, C.(ed.)(2001). Current concepts of orthopedic physical therapy: Home study course. LaCrosse, WI: Orthopaedic Secion, APTA, Inc.</ref><br>  
During elevation, the clavicle rotates upward on the manubrium and produces an inferior glide to maintain joint contact. The reverse actions happen when the clavicle is depressed. The motions are usually associated with elevation and depression of the scapula.<ref>Brody, L.T.:Shoulder. In: Wadsworth, C.(ed.)(2001). Current concepts of orthopedic physical therapy: Home study course. LaCrosse, WI: Orthopaedic Secion, APTA, Inc.</ref> The elevation is assumed to be 45 degrees and the depression to be 10 degrees. <ref name=":2">Neumann DA. Kinesiology of the musculoskeletal system; Foundation for rehabilitation. Mosby & Elsevier. 2010.</ref>
 
The elevation is limited by the tension of the costoclavicular ligament and the subscapularis muscle. Depression is limited by the superior sternoclavicular ligament, the interclavicular ligament, and by the bony contact with the first rib<ref name=":3" />.


{| width="100%" border="1" align="centre" cellpadding="2" cellspacing="2" style="font-size: 13px;"
{| width="100%" border="1" align="centre" cellpadding="2" cellspacing="2" style="font-size: 13px;"
|-
|-
! scope="col" colspan="2" bgcolor="#cccccc" |
! colspan="2" scope="col" bgcolor="#cccccc" |  
Elevation
Elevation (0-45 degrees) 
 
0° - 45°
 
! scope="col" colspan="2" bgcolor="#cccccc" |  
Depression
 
0° - 10°


! colspan="2" scope="col" bgcolor="#cccccc" |
Depression (0-10 degrees)
|-
!Muscles
!Nerve supply
!Muscles
!Nerve supply
|-
|-
| width="25%" align="center" | [[Levator_Scapulae|Levator Scapulae]]
| width="25%" align="center" | [[Levator_Scapulae|Levator Scapulae]]
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Cervical Nerves C3-C4&nbsp;  
Cervical Nerves C3-C4&nbsp;  


| align="center" | Pectoralis Minor  
| align="center" | [[Pectoralis Minor]]
| align="center" | Medial Pectoral C8-T1
| align="center" | Medial Pectoral C8-T1
|-
|-
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| width="25%" align="center" | [[Rhomboids|Rhomboids]]
| width="25%" align="center" | [[Rhomboids|Rhomboids]]
| width="25%" align="center" | Dorsal Scapular Nerve C4-C5  
| width="25%" align="center" | Dorsal Scapular Nerve C4-C5  
| width="25%" align="center" | Serratus Anterior - Inferior  
| width="25%" align="center" | [[Serratus Anterior]] - Inferior  
| width="25%" align="center" |  
| width="25%" align="center" |  
Long Thoracic C5-C6-C7&nbsp;  
Long Thoracic C5-C6-C7&nbsp;  
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==== Protraction and Retraction ====
==== Protraction and Retraction ====
During protraction, the concave surface of the medial clavicle moves on the convex sternum, producing an anterior glide of the clavicle, and an anterior rotation of the lateral clavicle. With retraction, the medial clavicle articulates with a flat surface and tilts or swings, causing an anterolateral gapping, and a posterior rotation at the lateral end. These movements are usually associated with abduction (protraction) and adduction (retraction) of the scapula, since the scapula is attached to the distal end of the clavicle.<ref>Conway, A.M. (1961). Movements at the sternoclavicular and acromioclavicular joints. Phys Ther Rev. 41: 421-432.</ref><ref>Levangie, P.K. &amp; Norkin, C.C. (2005). Joint structure and function: A comprehensive analysis (4th ed.). Philadelphia: The F.A. Davis Company.</ref>  
During protraction, the concave surface of the medial clavicle moves on the convex sternum, producing an anterior glide of the clavicle, and anterior rotation of the lateral clavicle. With retraction, the medial clavicle articulates with a flat surface and tilts or swings, causing an anterolateral gapping, and a posterior rotation at the lateral end. These movements are usually associated with abduction (protraction) and adduction (retraction) of the scapula since the scapula is attached to the distal end of the clavicle.<ref>Anna M.Conway, M.S.,Movements at the sternoclavicular and acromioclavicular joints. Physical Therapy,June 1961; 41(6): 421-432. Available from: https://doi.org/10.1093/ptj/41.6.421</ref><ref name=":1" />
 
The anterior movement is limited by tension in the costoclavicular and anterior and posterior ligaments. And the posterior movement is limited by tension in the anterior and posterior sternoclavicular ligaments<ref name=":3" />.


{| width="100%" border="1" align="centre" cellpadding="2" cellspacing="2" style="font-size: 13px;"
{| width="100%" border="1" align="centre" cellpadding="2" cellspacing="2" style="font-size: 13px;"
|-
|-
! colspan="2" scope="col" bgcolor="#cccccc" |  
! colspan="2" scope="col" bgcolor="#cccccc" |Protraction  
Protraction  


0° - 15° / 30°  
0° - 15° / 30°  
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0° - 15° / 30°  
0° - 15° / 30°  
|-
|-
| align="center" width="25%" | Pectoralis Minor  
!Muscles
!Nerve supply
!Muscles
!Nerve supply
|-
| align="center" width="25%" | [[Pectoralis Minor]]
| align="center" | Medial Pectoral C8-T1  
| align="center" | Medial Pectoral C8-T1  
| align="center" | [[Trapezius|Trapezius - Middle]]
| align="center" | [[Trapezius|Trapezius - Middle]]
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|-
|-
| rowspan="2" align="center" width="25%" | Serratus Anterior  
| rowspan="2" align="center" width="25%" | [[Serratus Anterior]]
| rowspan="2" align="center" width="25%" | Long Thoracic C5-C6-C7  
| rowspan="2" align="center" width="25%" | Long Thoracic C5-C6-C7  
| align="center" | [[Latissimus Dorsi Muscle|Latissimus Dorsi]]  
| align="center" | [[Latissimus Dorsi Muscle|Latissimus Dorsi]]  
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==== Axial Rotation ====
==== Axial Rotation ====
When the arm is raised over the head by flexion the clavicle rotates passively as the scapula rotates. This is transmitted to the clavicle by the coracoclavicular ligaments  
When the arm is raised over the head by flexion the clavicle rotates passively as the scapula rotates approximately around 40-50degrees.<ref name=":2" /> This is transmitted to the clavicle by the coracoclavicular ligaments. this movement is allowed by the relative slackness of the ligaments in this position<ref name=":3" />.   


{| width="100%" border="1" align="centre" cellpadding="2" cellspacing="2" style="font-size: 13px;"
{| width="100%" border="1" align="centre" cellpadding="2" cellspacing="2" style="font-size: 13px;"
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0° - 40° / 50°  
0° - 40° / 50°  
 
|-
!Muscles
!Nerve supply
!Muscles
!Nerve supply
|-
|-
| align="center" | [[Trapezius|Trapezius - Upper (Descending)]]
| align="center" | [[Trapezius|Trapezius - Upper (Descending)]]
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|-
|-
| rowspan="2" align="center" | Serratus Anterior - Inferior  
| rowspan="2" align="center" | [[Serratus Anterior|Serratus Anterio]]<nowiki/>r - Inferior  
| rowspan="2" width="25%" align="center" | Long Thoracic C5-C6-C7  
| rowspan="2" width="25%" align="center" | Long Thoracic C5-C6-C7  
| align="center" | Pectoralis Minor  
| align="center" | [[Pectoralis Minor]]
| align="center" |  
| align="center" |  
Medial Pectoral C8-T1&nbsp;  
Medial Pectoral C8-T1&nbsp;  
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|}
|}


== Video ==
{{#ev:youtube|https://youtu.be/q_wIlZsP3b8|width}}<ref>Catalyst University. The Sternoclavicular (SC) Joint | Anatomy and Function. Available from: https://youtu.be/q_wIlZsP3b8. [last accessed on: 2020/05/31]</ref>
=== Closed Packed Position  ===
=== Closed Packed Position  ===


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*Arm is resting by Side
*Arm is resting by Side


== Pathology / Injury  ==
<u></u>  
 
The Sternoclavicular Joint is vulnerable to the same disease processes as other synovial joints, the most common of which are instability from injury, osteoarthritis, infection and rheumatoid disease. Patients may also present with other conditions, which are unique to the joint, or are manifestations of a systemic disease process.The most common clinical presentation is pain and swelling in the area of the Sternoclavicular Joint, either after an injury to the shoulder, or insidiously, with no history of trauma.<ref>Disorders of the sternoclavicular jointfckLRC. M. Robinson, BMEdSci, FRCS Ed(Orth and Trauma), Consultant Orthopaedic Surgeon1; P. J. Jenkins, MRCS Ed, Specialty Registrar,</ref>&nbsp;A Sternoclavicular Joint sprain is a relatively rare sporting injury, which can range from a small sprain resulting in minimal pain and allowing ongoing activity, to a severe sprain resulting in significant pain, deformity and disability,<ref>http://www.physioadvisor.com.au/16459150/sternoclavicular-joint-sprain-sc-joint-sprain-.htm</ref>
 
== Techniques  ==
 
=== Treatment  ===
 
A mild '''sprain''' usually gets better by resting the joint for two to three days. Ice packs can be placed on the sore joint for up to 15 minutes at a time during the first few days after the injury.Moderate sprains may require some help to get the joint back into position. Your Physical Therapist at Humpal Physical Therapy &amp; Sports Medicine Centers may recommend a figure-eight strap wraps around both shoulders to support the SC joint. Patients with a moderate sprain may need to wear this type of strap for four to six weeks. The strap protects the joint from another injury and lets the injured ligaments heal and become strong again.
 
'''Osteoarthritis''' of the SC Joint usually responds to initial rest, ice, and anti-inflammatory medications with Physiotherapy treatments which include range-of-motion exercises as pain eases, followed by a program of strengthening. If the symptoms of osteoarthritis do not respond to basic treatment over six to 12 months, Physiotherapy may refer you for surgical evaluation. 
 
<u></u>For post surgical treatment your surgeon may have you wear a sling to support and protect the shoulder for a few days. Then your physiotherapy can begin a rehabilitation program. First few physiotherapy treatments will focus on controlling the pain and swelling from surgery, followed with with range-of-motion exercises and gradually work into active stretching and strengthening with progressive loading of the shoulder. <ref>http://www.humpalphysicaltherapy.com/Injuries-Conditions/Shoulder/Shoulder-Issues/Sternoclavicular-Joint-Problems/a~372/article.html</ref>  


== Resources References  ==
== Resources References  ==
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<references />  
<references />  


[[Category:Musculoskeletal/Orthopaedics]] [[Category:Anatomy]] [[Category:Shoulder]] [[Category:Thoracic Spine]] [[Category:Shoulder - Anatomy]] [[Category:Anatomy - Shoulder]] [[Category:Thoracic Spine - Anatomy]] [[Category:Anatomy - Thoracic Spine]] [[Category:Joints - Shoulder]] [[Category:Joints - Thoracic Spine]]
[[Category:Musculoskeletal/Orthopaedics]]  
[[Category:Anatomy]]  
[[Category:Shoulder]]  
[[Category:Thoracic Spine]]  
[[Category:Shoulder - Anatomy]]  
[[Category:Shoulder - Anatomy]]
[[Category:Thoracic Spine - Anatomy]]  
[[Category:Thoracic Spine - Anatomy]]  
[[Category:Shoulder - Joints]]
[[Category:Thoracic Spine - Joints]]
[[Category:Joints]]
[[Category:Course Pages]]
[[Category:Plus Content]]

Latest revision as of 11:27, 18 August 2022

Original Editor - Tyler Shultz

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Description[edit | edit source]

The Sternoclavicular Joint (SC joint) is formed from the articulation of the medial aspect of the clavicle and the manubrium of the sternum. The SC joint is the only true articulation connecting the upper limb to the axial skeleton, and that it’s the least constricted joint in the human body[1]. It is one of four joints that compose the Shoulder Complex.  The SC joint is generally classified as a plane style synovial joint and has a fibrocartilage joint disk.[2]  The ligamentous reinforcements of this joint are very strong, often resulting in a fracture of the clavicle before a dislocation of the SC joint.[3]

Anatomy[edit | edit source]

SC Joint.jpg

The SC joint is formed by the articulation of three bones[4]:

  • Manubrium, which means handle in Latin. The Manubrium is joined with the sternum.
  • The clavicle
  • The articulation between the first rib costal cartilage

Joint Capsule[edit | edit source]

The SC Joint capsule is fairly strong but is dependent on the ligaments for the majority of its support.

Joint Disk [edit | edit source]

The inter-articular fibrocartilage disc separates the joint into two compartments[4][5]. The first compartment lies between the manubrium and the disc and the second lies between the disc and the clavicle.

The SC Joint is surprisingly incongruent, and because of this incongruency, a joint disk is present to enhance joint curvature and contact of the joint surfaces. Similar to the meniscus of the knee, the SC Joint disk increases joint congruence and acts to absorb forces that may be transmitted along the clavicle. The disk is attached to the upper and posterior margin of the clavicle, and to the cartilage of the first rib, which functions to help prevent medial displacement of the clavicle. Greater movement occurs between the disk and the clavicle than between the disk and the manubrium. [2][6]

Ligaments [edit | edit source]

LIGAMENT

DESCRIPTION ATTACHMENT ROLE

Anterior

Sternoclavicular

Ligament [6][2]


Broad band of fibers, covering anterior surface of SC Joint running obliquely from proximal clavicle to sternum in a downward and medial direction

Superior & Anterior Aspect of

Sternal End of the Clavicle to the Anterior Superior Aspect

of manubrium

  • Reinforces the capsule anteriorly
  • Limits anterior translation of the clavicle
  • Checks anterior movement of the head of the clavicle

Posterior

Sternoclavicular
Ligament [6][2]

Broad band of fibers, covering posterior surface of SC Joint

Weaker than the Anterior Sternoclavicular Ligament.

Superior & Posterior Aspect

Sternal End Clavicle to Posterior Superior Aspect

of Manubrium

  • Reinforces the capsule Posteriorly
  • Limits the posterior translation of the Clavicle
  • Checks the posterior movement of the head of the clavicle

Costoclavicular

Ligament [6][2]

Anchors Inferior Surface of the Sternal End of the Clavicle to the 1st Rib & its Costal Cartilage


Orientation allows this ligament to act as the Primary Restraint for the SC Joint

Anterior lamina: laterally from first rib to the clavicle

Posterior lamina: medially from first rib to the clavicle
  • Limits the elevation of the pectoral girdle
  • Acts as a fulcrum for elevation-depression & protraction-retraction
  • Checks the clavicular elevation and superior glide of the clavicle

Interclavicular

Ligament [6][2]

Connects Sternal Ends of Each Clavicle with the Capsular Ligaments and Upper Manubrium

Produces a Bilateral Depression Force

Sternal end of one clavicle to sternal end of the other clavicle.
  • Strengthens the capsule superiorly
  • Resists excessive depression or downward glide of the clavicle


Ligaments-of-the-Sternoclavicular-Joint-1024x312.png


Muscles[edit | edit source]

There are no muscles that act directly on the SC Joint.  However, the SC Joint motions closely mimic the reciprocal motions of the scapula.  In addition, the following muscles have an attachment of the clavicle and therefore may produce movement of the clavicle: 

Function[edit | edit source]

Motions Available & Range of Movement[edit | edit source]

The SC Joint has 3 Degrees of Movement[7]:

  • Sagittal Plane: Anterior & Posterior Rotations
  • Frontal Plane: Elevation & Depression
  • Transverse Plane: Protraction & Retraction

Elevation and Depression  [edit | edit source]

During elevation, the clavicle rotates upward on the manubrium and produces an inferior glide to maintain joint contact. The reverse actions happen when the clavicle is depressed. The motions are usually associated with elevation and depression of the scapula.[8] The elevation is assumed to be 45 degrees and the depression to be 10 degrees. [9]

The elevation is limited by the tension of the costoclavicular ligament and the subscapularis muscle. Depression is limited by the superior sternoclavicular ligament, the interclavicular ligament, and by the bony contact with the first rib[4].

Elevation (0-45 degrees)

Depression (0-10 degrees)

Muscles Nerve supply Muscles Nerve supply
Levator Scapulae

Dorsal Scapular Nerve C5

Cervical Nerves C3-C4 

Pectoralis Minor Medial Pectoral C8-T1
Trapezius - Upper

Spinal Accessory Motor CN XI

Cervical Nerves C3-C4 

Trapezius Lower

Spinal Accessory Motor CN XI

Cervical Nerves C3-C4 

Rhomboids Dorsal Scapular Nerve C4-C5 Serratus Anterior - Inferior

Long Thoracic C5-C6-C7 


Protraction and Retraction[edit | edit source]

During protraction, the concave surface of the medial clavicle moves on the convex sternum, producing an anterior glide of the clavicle, and anterior rotation of the lateral clavicle. With retraction, the medial clavicle articulates with a flat surface and tilts or swings, causing an anterolateral gapping, and a posterior rotation at the lateral end. These movements are usually associated with abduction (protraction) and adduction (retraction) of the scapula since the scapula is attached to the distal end of the clavicle.[10][2]

The anterior movement is limited by tension in the costoclavicular and anterior and posterior ligaments. And the posterior movement is limited by tension in the anterior and posterior sternoclavicular ligaments[4].

Protraction

0° - 15° / 30°

Retraction

0° - 15° / 30°

Muscles Nerve supply Muscles Nerve supply
Pectoralis Minor Medial Pectoral C8-T1 Trapezius - Middle

Spinal Accessory Motor CN XI

Cervical Nerves C3-C4 

Serratus Anterior Long Thoracic C5-C6-C7 Latissimus Dorsi

Thoracodorsal Nerve C6 - C8 

Rhomboids

Dorsal Scapular NerveC4-C5

Axial Rotation[edit | edit source]

When the arm is raised over the head by flexion the clavicle rotates passively as the scapula rotates approximately around 40-50degrees.[9] This is transmitted to the clavicle by the coracoclavicular ligaments. this movement is allowed by the relative slackness of the ligaments in this position[4].  

Rotation Elevating Glenoid Cavity

0° - 40° / 50°

Axial Rotation Depressing Glenoid Cavity

0° - 40° / 50°

Muscles Nerve supply Muscles Nerve supply
Trapezius - Upper (Descending) Suprascapular Nerve C5-6 Levator Scapulae

Dorsal Scapular Nerve C5

Cervical Nerves C3-C4 

Trapezius - Lower Axillary Nerve C5-6 Latissimus Dorsi

Thoracodorsal Nerve C6 - C8 

Serratus Anterior - Inferior Long Thoracic C5-C6-C7 Pectoralis Minor

Medial Pectoral C8-T1 

Rhomboids

Dorsal Scapular Nerve C4-C5 


Video[edit | edit source]

[11]

Closed Packed Position[edit | edit source]

  • Maximum Shoulder Elevation

Open Packed Position[edit | edit source]

  • Arm is resting by Side

Resources References[edit | edit source]

References will automatically be added here, see adding references tutorial.

  1. ↑ Van Tongel A, MacDonald P, Leiter J, Pouliart N, Peeler J. A cadaveric study of the structural anatomy of the sternoclavicular joint. Clinical Anatomy. 2012 Oct;25(7):903-10.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Levangie, P.K. and Norkin, C.C. Joint structure and function: A comprehensive analysis (4th ed.). Philadelphia: The F.A. Davis Company;2005
  3. ↑ ALLMAN JR FL. Fractures and ligamentous injuries of the clavicle and its articulation. JBJS. 1967 Jun 1;49(4):774-84.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Horsley I. Sternoclavicular joint disorders Course. Plus 2020
  5. ↑ Negri JH, Malavolta EA, Assunção JH, Gracitelli ME, Pereira CA, Neto RB, Croci AT, Neto AF. Assessment of the function and resistance of sternoclavicular ligaments: A biomechanical study in cadavers. Orthopaedics & Traumatology: Surgery & Research. 2014 Nov 1;100(7):727-31.
  6. ↑ 6.0 6.1 6.2 6.3 6.4 Dutton M. Orthopaedic: Examination, evaluation, and intervention(2nd edition). New York: The McGraw-Hill Companies, Inc, 2008.
  7. ↑ Ludewig PM, Phadke V, Braman JP, et al: Motion of the shoulder complex during multiplayer humeral elevation. J Bone Joint Surg Am 91:378-389, 2009.
  8. ↑ Brody, L.T.:Shoulder. In: Wadsworth, C.(ed.)(2001). Current concepts of orthopedic physical therapy: Home study course. LaCrosse, WI: Orthopaedic Secion, APTA, Inc.
  9. ↑ 9.0 9.1 Neumann DA. Kinesiology of the musculoskeletal system; Foundation for rehabilitation. Mosby & Elsevier. 2010.
  10. ↑ Anna M.Conway, M.S.,Movements at the sternoclavicular and acromioclavicular joints. Physical Therapy,June 1961; 41(6): 421-432. Available from: https://doi.org/10.1093/ptj/41.6.421
  11. ↑ Catalyst University. The Sternoclavicular (SC) Joint | Anatomy and Function. Available from: https://youtu.be/q_wIlZsP3b8. [last accessed on: 2020/05/31]
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