Overview
what it is and why it mattersThe quadriceps tendon attaches the four quadriceps muscles to the superior pole of the patella. A complete rupture eliminates active knee extension — the patient cannot lift the leg with the knee straight. Ruptures typically occur at the insertion of the tendon into the patella and are more common in men over 40. Risk factors include chronic tendinopathy, diabetes, gout, obesity, renal failure, and fluoroquinolone use.
Diagnosis
exam first, imaging secondSudden pain above the knee during a stumble or jump, followed by inability to extend the knee and visible swelling. A palpable gap above the patella is pathognomonic. Lateral X-ray shows a low-riding patella (patella baja). MRI confirms complete vs. partial tear and assesses retraction.
Treatment Path
how care progresses at OSI1
Non-operative management
Only for partial tears with an intact extensor mechanism — cylinder cast in extension through the early healing phase. Complete ruptures require surgery.
Surgical Options at OSI
if non-operative care isn't enoughComplete quadriceps tendon ruptures require prompt surgical repair — delay leads to retraction and scarring, making repair more difficult and outcomes worse.
Providers Who Treat Quadriceps Tendon Rupture
sports-medicine team
Further Reading
authoritative sourcesExternal patient-education references and related OSI pages for additional background: