The following table summarises the differences between locking and unlocking of the knee joint.
| Locking of the knee joint | Unlocking of the knee joint |
| Medial rotation of the femur on tibia during terminal phase of extension | Lateral rotation of the femur on tibia during initial phase of the flexion |
| It is brought about by quadriceps femoris | It is brought about by the popliteus muscle |
| Locked knee becomes absolutely rigid | Unlocked knee can be further flexed |
| All ligaments are taut | All ligaments are relaxed |
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