What should you know about double patellar tendon rupture?

The patellar tendon connects the kneecap to the shinbone and helps transmit the force needed to straighten the knee. When both tendons tear, standing, walking, and lifting the legs can become very difficult. Sudden pain, swelling, bruising, or a feeling that the knees have given way may occur. A clinician examines the extensor mechanism and may use imaging to confirm the tear and look for associated injury.

Avoid walking without support and keep the knees protected until assessed. Do not force either knee to bend or attempt exercise. Treatment commonly involves surgical tendon repair, followed by a staged plan that controls motion while the repair heals. A brace, walking aid, and supervised physiotherapy may be used. Read about [Tendon Repair Surgery](/treatments/reconstructive-orthopedic-surgery/tendon-repair-surgery/) and [Post-Operative Rehabilitation](/treatments/physiotherapy-and-rehabilitation/post-operative-rehabilitation/) to understand the usual care pathway.

Seek urgent medical assessment after a fall, forceful knee movement, or sudden loss of active knee extension, especially when both knees are affected. Emergency help is appropriate if pain is severe, the legs look deformed, the feet become cold or numb, or you cannot move safely. Do not drive yourself if you cannot control the knees.

Ask whether both tendons are fully torn, what imaging shows, how soon repair should occur, and what brace position is recommended. Clarify weight-bearing limits, wound care, pain-control options, rehabilitation milestones, and how daily activities will be managed while both knees are protected.