Knee: Difference between revisions

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== &nbsp;Bones<br>  ==
== &nbsp;Bones<br>  ==


The knee joint is one of the largest and most complex joints in the body. It is constructed by 4&nbsp;bones and an extensive network of ligaments and muscles.  
The knee joint is one of the largest and most complex joints in the body. It is constructed by 4&nbsp;bones and an extensive network of ligaments and muscles.<ref name="1">Sports Injury Clinic. Anatomy. Knee Anatomy. Available at: http://www.sportsinjuryclinic.net/anatomy/knee-anatomy (accessed 29 july 2016).</ref>


The thigh bone ([http://www.physio-pedia.com/Femur Femur]), the shin bone ([http://www.physio-pedia.com/Tibia Tibia])&nbsp;and the kneecap ([http://www.physio-pedia.com/Patella Patella]) articulate&nbsp;through tibiofemoral and patellofemoral joints.&nbsp;These three bones are covered in articular cartilage which is an extremely hard, smooth substance designed to decrease the friction forces.&nbsp;The patella lies in an indentation of the femur known as the intercondylar groove.&nbsp;  
The thigh bone ([http://www.physio-pedia.com/Femur Femur]), the shin bone ([http://www.physio-pedia.com/Tibia Tibia])&nbsp;and the kneecap ([http://www.physio-pedia.com/Patella Patella]) articulate&nbsp;through tibiofemoral and patellofemoral joints.&nbsp;These three bones are covered in articular cartilage which is an extremely hard, smooth substance designed to decrease the friction forces.&nbsp;The patella lies in an indentation of the femur known as the intercondylar groove.<ref name="1" />&nbsp;  


The smaller shin bone that runs alonside the tibia (Fibula) is not directly involved in the knee joint<ref>Keith L. Moore. Clinically Oriented Anatomy 6e edition. P 634</ref>, but provides a surface for important muscles and ligaments to attach to.&nbsp;<br>  
The smaller shin bone that runs alonside the tibia (Fibula) is not directly involved in the knee joint, but provides a surface for important muscles and ligaments to attach to.<ref name="2">Keith L. Moore. Clinically Oriented Anatomy 6e edition. P 634</ref><ref name="1" />  


== Menisci  ==
== Menisci  ==


There are two menisci in the space between the femoral and tybial condyles. They are crescent-shaped lamellae, each with anterior and posterior horn, and are triangular in cross section. The surface of each meniscus is concave superiorly, providing a congruous surface to the femoral condyles and is flat inferiorly to accompany the relatively flat tibial plateau. The horns of the medial meniscus are further appart and meniscus appears ‘C’ shaped, than those of the lateral one where meniscus appears more ‘O’ shaped.&nbsp;  
There are two menisci in the space between the femoral and tybial condyles. They are crescent-shaped lamellae, each with anterior and posterior horn, and are triangular in cross section. The surface of each meniscus is concave superiorly, providing a congruous surface to the femoral condyles and is flat inferiorly to accompany the relatively flat tibial plateau.<ref name="3">L.Ombregt. A System of Orthopaedic Medicine - Third Edition. Applied anatomy of the knee. Pages e262 - e269.Elsevier Ltd. 2013.</ref> The horns of the medial meniscus are further appart and meniscus appears ‘C’ shaped, than those of the lateral one where meniscus appears more ‘O’ shaped.&nbsp;  


'''The menisci correct the lack of congruence between the articular surfaces of tibia and femur, increase the area of contact and improve weight distribtion and shock apsorption. They also help to guide and coordinate knee motion, making them very important stabilizers of the knee.'''<span style="font-size: 13.28px; line-height: 19.92px;">&nbsp;</span>  
'''The menisci correct the lack of congruence between the articular surfaces of tibia and femur, increase the area of contact and improve weight distribtion and shock apsorption. They also help to guide and coordinate knee motion, making them very important stabilizers of the knee.<ref name="3" />'''<span style="font-size: 13.28px; line-height: 19.92px;">&nbsp;</span>  


[[Image:Menisci top 95147470.jpg|right|450x300px]]  
[[Image:Menisci top 95147470.jpg|right|450x300px]]  
<div><div><div>
<div><div><div>
The menisci are connected with the tibia by coronary ligaments. The medial meniscus is much less mobile during joint motion than the lateral meniscus owing in large part to its firm attachment to the knee joint capsule and medial collateral ligament (MCL). On the lateral side, the meniscus is less firmly attached to the joint capsule and has no attachment to the lateral collateral ligament (LCL). In fact, the posterior horn of the lateral meniscus is separated&nbsp;entirely from the posterolateral aspect of the joint capsule by the tendon of the popliteus muscle as it descends from the lateral epicondyle of the femur.<ref>Dr. Michael D. Chivers. Anatomy and physical examination of the knee menisci: a narrative review of the orthopedic literature. JCCA 2009. (level A1)</ref>  
The menisci are connected with the tibia by coronary ligaments. The medial meniscus is much less mobile during joint motion than the lateral meniscus owing in large part to its firm attachment to the knee joint capsule and medial collateral ligament (MCL). On the lateral side, the meniscus is less firmly attached to the joint capsule and has no attachment to the lateral collateral ligament (LCL). In fact, the posterior horn of the lateral meniscus is separated&nbsp;entirely from the posterolateral aspect of the joint capsule by the tendon of the popliteus muscle as it descends from the lateral epicondyle of the femur.<ref name="4">Dr. Michael D. Chivers. Anatomy and physical examination of the knee menisci: a narrative review of the orthopedic literature. JCCA 2009. (level A1)</ref>  
Menisci do not contain pain-sensitive structures and are consequently insensitive to trauma. Their outher third (red zone) has some blood supply and therefore a slight ability to heal. The inner non-vascularized part (white zone) receives nutrition through diffusion of synovial fluid.</div></div></div>  
Menisci do not contain pain-sensitive structures and are consequently insensitive to trauma. Their outher third (red zone) has some blood supply and therefore a slight ability to heal. The inner non-vascularized part (white zone) receives nutrition through diffusion of synovial fluid.<ref name="3" /></div></div></div>  
== The Joint Capsule<br>  ==
== The Joint Capsule<br>  ==


The joint capsule is a thick ligamentous structure that surrounds the entire knee. Inside this capsule is a specialized membrane known as the synovial membrane which provides nourishment to all the surrounding structures. The synovial membrane produces synovial fluid which lubricates the knee joint. Other structures include the infrapatellar fat pad and bursa which function as cushions to exterior forces on the knee. The capsule itself is strengthened by the surrounding ligaments.&nbsp;  
The joint capsule is a thick ligamentous structure that surrounds the entire knee. Inside this capsule is a specialized membrane known as the synovial membrane which provides nourishment to all the surrounding structures. The synovial membrane produces synovial fluid which lubricates the knee joint. Other structures include the infrapatellar fat pad and bursa which function as cushions to exterior forces on the knee. The capsule itself is strengthened by the surrounding ligaments.<ref name="1" />&nbsp;  


== Ligaments&nbsp;  ==
== Ligaments&nbsp;  ==
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The ligaments of the knee maintain the stability of the knee. Each ligament has a particular function in helping to maintain optimal knee stability.  
The ligaments of the knee maintain the stability of the knee. Each ligament has a particular function in helping to maintain optimal knee stability.  


#'''Medial Collateral Ligament''' (MCL) - This band runs from the medial epicondyle of the femur to the medial condyl and the superior part of the medial surface of the tibia. In the middle of the ligament the deep fibers are attached to the medial meniscus<ref>Keith L. Moore. Clinically Oriented Anatomy 6e edition. P 636</ref>. MCL resists forces acting from the outer surface of the knee, valgus forces.  
#'''Medial Collateral Ligament''' (MCL) - This band runs from the medial epicondyle of the femur to the medial condyl and the superior part of the medial surface of the tibia. In the middle of the ligament the deep fibers are attached to the medial meniscus.<ref name="5">Keith L. Moore. Clinically Oriented Anatomy 6e edition. P 636</ref>&nbsp;MCL resists forces acting from the outer surface of the knee, valgus forces.  
#'''Lateral Collateral Ligament''' (LCL) – a cord like ligament that begins on the lateral epicoondyle of the femur to the lateral surface of the fibula head. It resists impacts from the inner surface of the knee, varus forces.  
#'''Lateral Collateral Ligament''' (LCL) – a cord like ligament that begins on the lateral epicoondyle of the femur to the lateral surface of the fibula head. It resists impacts from the inner surface of the knee, varus forces.  
#'''Anterior Cruciate Ligament''' (ACL) - The ACL is one of the most important structures in the knee. The cruciate ligaments are so called because they form a cross in the middle of the knee joint. The ACL, runs from the anterior of the tibia to the posterior of the femur and prevents the tibia moving forward. It is most commonly injured in twisting movements<ref>Lam MH et al. Knee rotational stability during pivoting movement is restored after anatomic double-bundle anterior cruciate ligament reconstruction. Am J Sports Med. 2011. (level b)</ref>.
#'''Anterior Cruciate Ligament''' (ACL) - The ACL is one of the most important structures in the knee. The cruciate ligaments are so called because they form a cross in the middle of the knee joint. The ACL, runs from the anterior of the tibia to the posterior of the femur and prevents the tibia moving forward. It is most commonly injured in twisting movements.<ref name="6">Lam MH et al. Knee rotational stability during pivoting movement is restored after anatomic double-bundle anterior cruciate ligament reconstruction. Am J Sports Med (level b). 2011.</ref>
#'''Posterior Cruciate Ligament''' (PCL) - This ligament runs from the posterior surface of the tibia to the anterior surface of the femur and so wraps around the ACL. The PCL limits anterior rolling of the femur on the tibial plateau during extension<ref>Shingo Fukagawa. Posterior Displacement of the Tibia Increases in Deep Flexion of the Knee. 2009. (level C)</ref>.<br>
#'''Posterior Cruciate Ligament''' (PCL) - This ligament runs from the posterior surface of the tibia to the anterior surface of the femur and so wraps around the ACL. The PCL limits anterior rolling of the femur on the tibial plateau during extension.<ref name="7">Shingo Fukagawa. Posterior Displacement of the Tibia Increases in Deep Flexion of the Knee (level C). 2009.</ref>


== Muscles and Tendons  ==
== Muscles and Tendons  ==
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| L5, S1
| L5, S1
|}
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<ref name="3" />


'''*''' - These three muscles formes so-called ''pes anserinus''.  
'''*''' - These three muscles formes so-called ''pes anserinus''.  
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= Function:  =
= Function:  =
<div>
<div>
The ligaments and menisci provide static stability and the muscles and tendons dynamic stability. The main movement of the knee is '''flexion - extension'''. For that matter, knee act as a hinge joint, whereby the articular surfaces of the femur roll and glide over the tibial surface.During flexion and extension, tibia and patella act as one structure in relation to the femur.  
The ligaments and menisci provide static stability and the muscles and tendons dynamic stability. The main movement of the knee is '''flexion - extension'''. For that matter, knee act as a hinge joint, whereby the articular surfaces of the femur roll and glide over the tibial surface.During flexion and extension, tibia and patella act as one structure in relation to the femur.<ref name="3" />
[[Image:Mus29.jpg|right|150x100px]]</div><div>
[[Image:Mus29.jpg|right|150x100px]]</div><div>
<br> The quadriceps muscle group is made up of four different individual muscles. They join together forming one single tendon which inserts&nbsp;into&nbsp;the anterior tibial tuberosity. Imbelded in the tendon is patella, a triangular sesamoid bone and its function is to increase the efficiency of the&nbsp;quadriceps contractions.&nbsp;Contraction of the quadriceps pulls the patella upwards and extends the knee.&nbsp;'''Range of motion: extension 0'''<sup>'''o'''</sup>.<br> [[Image:Mus30.jpg|right|150x150px]]  
<br> The quadriceps muscle group is made up of four different individual muscles.<ref name="1" /> They join together forming one single tendon which inserts&nbsp;into&nbsp;the anterior tibial tuberosity. Imbelded in the tendon is patella, a triangular sesamoid bone and its function is to increase the efficiency of the&nbsp;quadriceps contractions.&nbsp;Contraction of the quadriceps pulls the patella upwards and extends the knee.<ref name="3" />&nbsp;'''Range of motion: extension 0'''<sup>'''o'''</sup>.<br> [[Image:Mus30.jpg|right|150x150px]]  


The hamstring muscle group consist m.biceps femoris, m.semitendinosus and m.semimembranosus. They&nbsp;are situated at the back of the thigh and their&nbsp;function is flexing or bending the knee as well as providing stability on either side of the joint line.&nbsp;'''Range of motion:&nbsp;flexion 140<sup>o</sup>.'''  
The hamstring muscle group consist m.biceps femoris, m.semitendinosus and m.semimembranosus. They&nbsp;are situated at the back of the thigh and their&nbsp;function is flexing or bending the knee as well as providing stability on either side of the joint line.<ref name="1" /><ref name="3" />&nbsp;'''Range of motion:&nbsp;flexion 140<sup>o</sup>.'''  


<br>  
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<br>  
<br>  


Secondary movement is'''internal - external rotation''' of the tibia in relation to the femur, but it is possible only when the knee is flexed.
Secondary movement is'''internal - external rotation''' of the tibia in relation to the femur, but it is possible only when the knee is flexed.<ref name="3" />
</div>  
</div>  
<br>  
<br>  
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| align="left" |  
| align="left" |  
{{#ev:youtube|_q-Jxj5sT0g|350}} <ref> Anatomy Zone. Knee Joint - Part 1 - 3D Anatomy Tutorial. Available from: http://www.youtube.com/watch?v=ve448qTT_-4 [last accessed 21/09/14]</ref>  
{{#ev:youtube|_q-Jxj5sT0g|350}} <ref name="8">Rendale Sechrest. Knee Anatomy Animated Tutorial. Available from: https://www.youtube.com/watch?v=_q-Jxj5sT0g (accessed 29 july 2016).</ref>  


| <br>  
| <br>  
| align="right" |  
| align="right" |  
{{#ev:youtube|ZNzfJCIEkQI|350}} <ref> Anatomy Zone. Knee Joint - Part 2 - 3D Anatomy Tutorial. Available from: http://www.youtube.com/watch?v=58g4nWqbHAc [last accessed 21/09/14]</ref>  
{{#ev:youtube|ZNzfJCIEkQI|350}} <ref name="9">Surfwayne71. Knee - Surface Anatomy, ROOm and Strength. Available from: https://www.youtube.com/watch?v=ZNzfJCIEkQI (accessed 29 july 2016).</ref>  


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== Closed Packed Position:  ==
== Closed Packed Position:  ==


Near full extension. There is a medial rotation of the femoral condyles on the tibial plateau<ref>Lentell G. The effect of knee position on torque output during inversion and eversion movements at the ankle. J Orthop Sports Phys Ther. 1988.</ref>.<br>  
Near full extension. There is a medial rotation of the femoral condyles on the tibial plateau<ref name="10">Lentell G. The effect of knee position on torque output during inversion and eversion movements at the ankle. J Orthop Sports Phys Ther. 1988.</ref>.<br>  


== Open Packed Position:  ==
== Open Packed Position:  ==


Midrange flexion<ref>Lentell G. The effect of knee position on torque output during inversion and eversion movements at the ankle. J Orthop Sports Phys Ther. 1988.</ref>. <br>  
Midrange flexion<ref name="10" />. <br>  


== Clinical Examination  ==
== Clinical Examination  ==
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== Recent Related Research (from [http://www.ncbi.nlm.nih.gov/pubmed/ Pubmed])  ==
== Recent Related Research (from [http://www.ncbi.nlm.nih.gov/pubmed/ Pubmed])  ==
<div class="researchbox">
<rss>http://www.ncbi.nlm.nih.gov/entrez/eutils/erss.cgi?rss_guid=1VmNOZgUnBp2VQeunHROhMKSDF50bW4EBZdSWlefnA0MZtgkh9!!|charset=UTF­8|short|max=10</rss>
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<div class="researchbox">
<rss>http://www.ncbi.nlm.nih.gov/entrez/eutils/erss.cgi?rss_guid=1VmNOZgUnBp2VQeunHROhMKSDF50bW4EBZdSWlefnA0MZtgkh9!!|charset=UTF­8|short|max=10</rss>
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= Reference  =
= Reference  =



Revision as of 22:39, 29 July 2016

Anatomy of the Knee[edit | edit source]

Knee-patella.jpg

 Bones
[edit | edit source]

The knee joint is one of the largest and most complex joints in the body. It is constructed by 4 bones and an extensive network of ligaments and muscles.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title

The thigh bone (Femur), the shin bone (Tibia) and the kneecap (Patella) articulate through tibiofemoral and patellofemoral joints. These three bones are covered in articular cartilage which is an extremely hard, smooth substance designed to decrease the friction forces. The patella lies in an indentation of the femur known as the intercondylar groove.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title 

The smaller shin bone that runs alonside the tibia (Fibula) is not directly involved in the knee joint, but provides a surface for important muscles and ligaments to attach to.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive titleCite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title

Menisci[edit | edit source]

There are two menisci in the space between the femoral and tybial condyles. They are crescent-shaped lamellae, each with anterior and posterior horn, and are triangular in cross section. The surface of each meniscus is concave superiorly, providing a congruous surface to the femoral condyles and is flat inferiorly to accompany the relatively flat tibial plateau.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title The horns of the medial meniscus are further appart and meniscus appears ‘C’ shaped, than those of the lateral one where meniscus appears more ‘O’ shaped. 

The menisci correct the lack of congruence between the articular surfaces of tibia and femur, increase the area of contact and improve weight distribtion and shock apsorption. They also help to guide and coordinate knee motion, making them very important stabilizers of the knee.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title 

Menisci top 95147470.jpg

The menisci are connected with the tibia by coronary ligaments. The medial meniscus is much less mobile during joint motion than the lateral meniscus owing in large part to its firm attachment to the knee joint capsule and medial collateral ligament (MCL). On the lateral side, the meniscus is less firmly attached to the joint capsule and has no attachment to the lateral collateral ligament (LCL). In fact, the posterior horn of the lateral meniscus is separated entirely from the posterolateral aspect of the joint capsule by the tendon of the popliteus muscle as it descends from the lateral epicondyle of the femur.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title

Menisci do not contain pain-sensitive structures and are consequently insensitive to trauma. Their outher third (red zone) has some blood supply and therefore a slight ability to heal. The inner non-vascularized part (white zone) receives nutrition through diffusion of synovial fluid.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title

The Joint Capsule
[edit | edit source]

The joint capsule is a thick ligamentous structure that surrounds the entire knee. Inside this capsule is a specialized membrane known as the synovial membrane which provides nourishment to all the surrounding structures. The synovial membrane produces synovial fluid which lubricates the knee joint. Other structures include the infrapatellar fat pad and bursa which function as cushions to exterior forces on the knee. The capsule itself is strengthened by the surrounding ligaments.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title 

Ligaments [edit | edit source]

The ligaments of the knee maintain the stability of the knee. Each ligament has a particular function in helping to maintain optimal knee stability.

  1. Medial Collateral Ligament (MCL) - This band runs from the medial epicondyle of the femur to the medial condyl and the superior part of the medial surface of the tibia. In the middle of the ligament the deep fibers are attached to the medial meniscus.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title MCL resists forces acting from the outer surface of the knee, valgus forces.
  2. Lateral Collateral Ligament (LCL) – a cord like ligament that begins on the lateral epicoondyle of the femur to the lateral surface of the fibula head. It resists impacts from the inner surface of the knee, varus forces.
  3. Anterior Cruciate Ligament (ACL) - The ACL is one of the most important structures in the knee. The cruciate ligaments are so called because they form a cross in the middle of the knee joint. The ACL, runs from the anterior of the tibia to the posterior of the femur and prevents the tibia moving forward. It is most commonly injured in twisting movements.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title
  4. Posterior Cruciate Ligament (PCL) - This ligament runs from the posterior surface of the tibia to the anterior surface of the femur and so wraps around the ACL. The PCL limits anterior rolling of the femur on the tibial plateau during extension.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title

Muscles and Tendons[edit | edit source]

Muscles Function Periferal nerve Spinal inervation
M. Quadriceps femoris  - strong extensor of the knee Femoral L2, L3, L4
M. Semitendinosus*

- flexor and internal rotator of the knee

Tibial L5, S1, S2
M. Semimembranosus

- flexor and internal rotator of the knee

Tibial L5, S1, S2
M. Gracilis*

- flexor and internal rotator of the knee

Obturator L2, L3, L4
M. Sartorius*

- flexor and internal rotator of the knee

Femoral L2, L3
M. Popliteus

- flexor and internal rotator of the knee

- prevents the femur from slipping forwards on the tibia during squatting

Tibial L4, L5, S1
M. Tensor fasciae latae

- weak extensor when knee is extended

- weak flexor and external rotator of the knee in flexion greater than 30o

Superior gluteal L4, L5
M. Gastrocnemius

- weak flexor of the knee

- weak internal and external rotator of the knee

- strong plantiflexor and inventor of the heel

Tbial S1, S2
M. Biceps femoris

- strong flexor and external rotator of the knee

Sciatic L5, S1

Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title

* - These three muscles formes so-called pes anserinus.

Function:[edit | edit source]

The ligaments and menisci provide static stability and the muscles and tendons dynamic stability. The main movement of the knee is flexion - extension. For that matter, knee act as a hinge joint, whereby the articular surfaces of the femur roll and glide over the tibial surface.During flexion and extension, tibia and patella act as one structure in relation to the femur.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title

Mus29.jpg

The quadriceps muscle group is made up of four different individual muscles.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title They join together forming one single tendon which inserts into the anterior tibial tuberosity. Imbelded in the tendon is patella, a triangular sesamoid bone and its function is to increase the efficiency of the quadriceps contractions. Contraction of the quadriceps pulls the patella upwards and extends the knee.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title Range of motion: extension 0o.
Mus30.jpg

The hamstring muscle group consist m.biceps femoris, m.semitendinosus and m.semimembranosus. They are situated at the back of the thigh and their function is flexing or bending the knee as well as providing stability on either side of the joint line.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive titleCite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title Range of motion: flexion 140o.




Secondary movement isinternal - external rotation of the tibia in relation to the femur, but it is possible only when the knee is flexed.Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title


Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title

Cite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title

                                                  

Closed Packed Position:[edit | edit source]

Near full extension. There is a medial rotation of the femoral condyles on the tibial plateauCite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title.

Open Packed Position:[edit | edit source]

Midrange flexionCite error: Invalid <ref> tag; name cannot be a simple integer. Use a descriptive title.

Clinical Examination[edit | edit source]

Conditions
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Procedures
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Interventions[edit | edit source]

Recent Related Research (from Pubmed)[edit | edit source]


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Reference[edit | edit source]

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