Extensor mechanism of the knee injuries
Dr Jeremy Jones and Dr Frank Gaillard et al.
The extensor mechanism of the knee comprises:
- quadriceps muscle
- quadriceps tendon
- medial retinaculum
- lateral retinaculum
- patella
- patellar tendon
- tibial tuberosity
Injury to any of these structures constitutes an extensor mechanism injury. Such injuries include:
- quadriceps muscle tears
- quadriceps tendon rupture
- patella tendon rupture
- patella fracture
- patella dislocation often with medial retinaculm tears
- patella sleeve fractures
Chronic injuries :

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