A small bursa between the vastus medialis muscle belly and the medial femoral shaft, reducing friction during quadriceps contraction. It is most consistently present in the distal third of the thigh near the adductor canal.
Vastus medialis bursitis is an uncommon cause of medial thigh pain, presenting as aching exacerbated by resisted knee extension and direct pressure over the medial distal thigh. It may be confused with saphenous nerve entrapment or adductor canal syndrome. Ultrasound distinguishes bursal fluid from the saphenous neurovascular bundle. Management is conservative.
Bursal inflammation producing medial thigh pain near the adductor canal, worsened by quadriceps activity, distinguished from adductor canal nerve entrapment by the absence of medial leg numbness.
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