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. 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. 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.<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> 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 JR FL. Fractures and ligamentous injuries of the clavicle and its articulation. JBJS. 1967 Jun 1;49(4):774-84.</ref> | 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<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. 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> 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 JR FL. Fractures and ligamentous injuries of the clavicle and its articulation. JBJS. 1967 Jun 1;49(4):774-84.</ref> | ||
== Anatomy == | == Anatomy == | ||
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=== Joint Disk === | === Joint Disk === | ||
The inter-articular fibrocartilage disc separates the joint into two joints<ref name=":3">Horsley I. Sternoclavicular joint disorders Course. Physioplus 2020 </ref>. The first joint lies between the manubrium and the disc and the second lies between the disc and the clavicle. | The inter-articular fibrocartilage disc separates the joint into two joints<ref name=":3">Horsley I. Sternoclavicular joint disorders Course. Physioplus 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 joint 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 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. This orientation divides the joint into separate cavities. Greater movement occurs between the disk and the clavicle than between the disk and the manubrium. <ref name=":1" /><ref name=":0" /> | 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 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. This orientation divides the joint into separate cavities. Greater movement occurs between the disk and the clavicle than between the disk and the manubrium. <ref name=":1" /><ref name=":0" /> | ||
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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 a fracture of the clavicle before a dislocation of the SC Joint.[3]
Anatomy[edit | edit source]
The SC joint is formed by the articulation of three bones:
- 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 noted above for the majority of its support.
Joint Disk [edit | edit source]
The inter-articular fibrocartilage disc separates the joint into two joints[4][5]. The first joint 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 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. This orientation divides the joint into separate cavities. 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 |
|
Superior & Anterior Aspect of Sternal End Clavicle to Anterior Superior Aspect of manubrium |
Reinforce capsule anteriorly
Limits anterior translation of clavicle Checks anterior movement of head of clavicle |
|
Posterior |
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 |
Reinforce Capsule Posteriorly Limits Posterior Translation of Clavicle Checks Posterior Movement of Head of Clavicle |
|
Costoclavicular |
Anchors Inferior Surface of Sternal End of Clavicle to 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 Elevation of Pectoral Girdle Acts as Fulcrum for Elevation-Depression Protration-Retraction Checks Clavicular Elevation and Superior Glide of Clavicle |
|
Interclavicular |
Connects Sternal Ends of Each Clavicle with Capsular Ligaments and Upper Manubrium Produces a Bilateral Depression Force |
Sternal end of one clavicle to sternal end of other clavicle. | Strengthens Capsule Superiorly Resists Excessive Depression or Downward Glide of Clavicle |
Muscles[edit | edit source]
There are no muscles that act directly on the SC Joint. However, the SC Joint motions closely mimic the reciprical motions of the scapula. In addition, the following muscles have an attachment of the clavicle and therefore may produce movement of the clavicle:
- Deltoid
- Pectoralis Major (Clavicular Head)
- Trapezius
- Sternocleidomastoid
Function[edit | edit source]
Motions Available & Range of Movement[edit | edit source]
The SC Joint has 3 Degrees of Movement
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.[7]The elevation is assumed to be 45 degrees and the depression to be 10 degrees. [8]
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 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.[9][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.[8] 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]
Closed Packed Position[edit | edit source]
- Maximum Shoulder Elevation
Open Packed Position[edit | edit source]
- Arm is resting by Side
Pathology / Injury[edit | edit source]
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.[11] 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,[12]
Techniques[edit | edit source]
Treatment[edit | edit source]
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 Patients with a moderate sprain may need to wear some type of strap for four to six weeks until the healing occurs.
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.
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. [13]
Resources References[edit | edit source]
References will automatically be added here, see adding references tutorial.
- ↑ 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.
- ↑ 2.0 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
- ↑ ALLMAN JR FL. Fractures and ligamentous injuries of the clavicle and its articulation. JBJS. 1967 Jun 1;49(4):774-84.
- ↑ 4.0 4.1 4.2 4.3 Horsley I. Sternoclavicular joint disorders Course. Physioplus 2020
- ↑ 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.
- ↑ 6.0 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.
- ↑ Brody, L.T.:Shoulder. In: Wadsworth, C.(ed.)(2001). Current concepts of orthopedic physical therapy: Home study course. LaCrosse, WI: Orthopaedic Secion, APTA, Inc.
- ↑ 8.0 8.1 Neumann DA. Kinesiology of the musculoskeletal system; Foundation for rehabilitation. Mosby & Elsevier. 2010.
- ↑ 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
- ↑ Catalyst University. The Sternoclavicular (SC) Joint | Anatomy and Function. Available from: https://youtu.be/q_wIlZsP3b8. [last accessed on: 2020/05/31]
- ↑ Disorders of the sternoclavicular jointfckLRC. M. Robinson, BMEdSci, FRCS Ed(Orth and Trauma), Consultant Orthopaedic Surgeon1; P. J. Jenkins, MRCS Ed, Specialty Registrar,
- ↑ http://www.physioadvisor.com.au/16459150/sternoclavicular-joint-sprain-sc-joint-sprain-.htm
- ↑ http://www.humpalphysicaltherapy.com/Injuries-Conditions/Shoulder/Shoulder-Issues/Sternoclavicular-Joint-Problems/a~372/article.html
