Knee bursae

Knee bursae
Sagittal section of right knee-joint, thus showing only frontal bursae.
Gray's	subject #93 345

The bursae of the knee are the fluid sacs and synovial pockets that surround and sometimes communicate with the joint cavity. Thin-walled and filled with synovial fluid, they represent the weak point of the joint, but also produce enlargements to the joint space. They can be grouped into either communicating and non-communicating bursae or, as below, after location.

Frontal

In front there are five bursae:

1. the suprapatellar bursa or recess between the anterior surface of the lower part of the femur and the deep surface of the quadriceps femoris. It allows for movement of the quadriceps tendon over the distal end of the femur
2. the prepatellar bursa between the patella and the skin, results in "housemaid's knee" when inflamed. It allows movement of the skin over the underlying patella.
3. the deep infrapatellar bursa between the upper part of the tibia and the patellar ligament. It allows for movement of the patellar ligament over the tibia.
4. the subcutaneous [or superficial] infrapatellar bursa between the patellar ligament and skin.
5. the pretibial bursa between the tibial tuberosity and the skin. It allows for movement of the skin over the tibial tuberosity.

Lateral

Laterally there are four bursæ:

1. the lateral gastrocnemius [subtendinous] bursa between the lateral head of the gastrocnemius and the joint capsule
2. the fibular bursa between the lateral (fibular) collateral ligament and the tendon of the biceps femoris
3. the fibulopopliteal bursa between the fibular collateral ligament and the tendon of the popliteus
4. and the subpopliteal recess (or bursa) between the tendon of the popliteus and the lateral condyle of the femur

Medial

Medially, there are five bursae:

1. the medial gastrocnemius [subtendinous] bursa between the medial head of the gastrocnemius and the joint capsule
2. the anserine bursa between the medial (tibial) collateral ligament and the tendons of the sartorius, gracilis, and semitendinosus (i.e. the pes anserinus)
3. the bursa semimembranosa between the medial collateral ligament and the tendon of the semimembranosus
4. there is one between the tendon of the semimembranosus and the head of the tibia
5. and occasionally there is a bursa between the tendons of the semimembranosus and semitendinosus

See also

• Medial meniscus
• Lateral meniscus

References

• Burgener, Francis A.; Meyers, Steven P.; Tan, Raymond K. (2002). Differential Diagnosis in Magnetic Resonance Imaging. Thieme. ISBN 1588900851. http://books.google.com/books?id=brsH_IqPzzoC&pg=PA390. 
• Cipriano, Joseph J. (2002). Photographic Manual of Regional Orthopaedic and Neurological Tests. Lippincott Williams & Wilkins. ISBN 0781735521. http://books.google.com/books?id=nlUR1toYU8UC&pg=PA356. 
• "Gray's Anatomy: The Knee-joint". 1918. http://education.yahoo.com/reference/gray/subjects/subject/93#p345. Retrieved December 2008. 
• Platzer, Werner (2004). Color Atlas of Human Anatomy, Vol. 1: Locomotor System (5th ed.). Thieme. ISBN 3-13-533305-1. 

External links

• Image at nlm.nih.gov