ACL and PCL are almost exactly opposite in their functions.
Anterior cruciate Ligament
- Major stabilizer of knee
- Limits anterior translation of tibia on femur
- Limits hyper extension of knee
- Attached on tibia just behind anterior horn of medial meniscus
- Runs upwards forwards,backwards and laterally.
- Attached on femur over medial surface of lateral femoral condyle
- Intracapsular and intrasynovial
- Taut during extension of knee
- Injury is by a twisting force on a semiflexed knee
Posterior cruciate Ligament
- Prevents posterior tanslation of tibia on femur
- Limits hyperextension of knee only if ACL is ruptured
- Attached to tibia behind posterior horn of medial meniscus
- Runs upwards forwards and medially
- Attached on femur over lateral surface of medial femoral condyle
- Intracapsular but extrasynovial
- Taut during flexion of knee
- Dashboard impact injury is the most common type of injury
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