|
Year |
2002 |
|---|---|
|
Question Number |
105 |
|
Category |
Orthopaedic Science |
Question
The sartorius muscle can be identified along the medial aspect of the knee joint by its:
1. position deep to the medial collateral ligament.
2. tendinous character.
3. insertion on the posteromedial aspect of the tibia.
4. central location in the pes anserinus expansion.
5. relationship to the saphenous nerve on its posterior border.
Figures
Answer (click for answer)
Preferred Answer: 5
Saphenous nerve arises from femoral nerve in femoral triangle and descends through it on lateral side of the femoral vessels to enter the adductor canal. It crosses the vessels obliquely to lie on their medial side in front of lower end of adductor magnus muscle. Nerve continues its descent on medial side of knee, pierces fascia lata between tendons of sartorius & gracilis, & then passes downward on the medial side of leg close to greater saphenous vein. At lower end of canal, it leaves femoral vessels & gives off its infrapatellar branch, & runs onward to supply skin over medial side and front of knee and patellar ligament. Saphenous nerve lies posterior to sartorius in 60%. In the lower leg, it subdivides: one branch follows the medial tibial border to the level of the ankle, larger passes anterior to medial malleolus to innervate skin on medialand dorsal side foot.
Reference: Hoppenfeld S Surgical Exposures in Orthopaedics: The Anatomical Approach, ed 2
Philadelphia, PA JB Lippincott 1994, pp 389-441