The rectus femoris tendon is the most superficial layer of the quadriceps tendon, contributing the central portion. At the proximal end, the direct head from the AIIS and the reflected head from the acetabular groove create a complex proximal anatomy that requires careful MRI assessment in AIIS avulsion injuries. Calcification within the proximal rectus femoris origin from prior avulsion injury is a common incidental finding on hip radiographs.
Quadriceps and hip flexion force transmission; only biarticular quadriceps component
Rectus femoris proximal tears typically occur at the musculotendinous junction during explosive kicking, producing anterior hip and proximal thigh pain with a palpable defect in complete tears. MRI classifies the injury by the percentage of tendon cross-sectional area torn. Return to sport averages 6 to 8 weeks for Grade II tears and 12 to 16 weeks for Grade III complete tears.
Musculotendinous junction disruption during kicking producing anterior hip and thigh pain managed conservatively for partial tears and occasionally surgically for complete avulsions with significant retraction.
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