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Psoas bursitis
 Psoas bursitis :
Spontaneous onset of anterior thigh pain. On examination, there is usually pain on passive flexion, lateral rotation and extension, with a soft end-feel. Passive adduction in 90° hip flexion, as a complementary test, is generally the most painful movement.
In most cases, treatment consists of infiltration of a local anaesthetic, which also confirms the diagnosis. In a minority of cases, triamcinolone is added.
Differential diagnosis :
psoas muscle belly (= resisted hip flexion should be positive)
rectus femoris tendinitis (= resisted knee extension should be positive)
osteoarthrosis (= we expect a capsular pattern with a harder end-feel)
loose body without osteoarthrosis (= we expect twinges and giving way)
gluteal bursitis (= pain lateral instead of anterior).
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