Quadriceps Tendon

tendo quadricipitis femoris

The quadriceps tendon is a composite structure formed by the aponeuroses of all four quadriceps components (rectus femoris, vastus intermedius, vastus medialis, vastus lateralis), converging in three layers to insert onto the superior patellar pole. The rectus femoris layer is superficial, the vasti form the middle and deep layers. The tendon continues as the patellar retinaculae on either side.

Region: Knee

Clinical Relevance

Clinical Notes

Quadriceps tendon rupture is more common than patellar tendon rupture, predominantly affecting patients over 40 with predisposing conditions (diabetes, chronic renal failure, steroid use, fluoroquinolone use). It produces loss of active knee extension, a palpable suprapatellar gap, and a low-riding patella (patella baja). Ultrasound and MRI confirm the tear location and degree. Complete rupture requires surgical repair — transosseous repair into the patellar superior pole with augmentation in chronic cases. Partial tears are managed conservatively with progressive loading in extension.

Pathology

Common Injuries & Conditions

Quadriceps Tendinopathy

Superior patellar pole tendon degeneration from repetitive loading, producing pain on stairs and squatting distinct from patellar tendinopathy by its location above rather than below the patella.

Quadriceps Tendon Rupture

Complete tear above the patella from sudden eccentric overload — more common in middle-aged men — producing inability to extend the knee against gravity and a low-riding, distal patella.