A capsule is a container which surrounds and protects something.
In the context of the knee, the knee capsule is a complex of anatomical structures - fibrous material, tendons and ligaments - surrounding the inner joint.
Damage to the medial (inner aspect) capsular structures is more common, but damage to the lateral structures is usually more serious.
The important postero-lateral corner In particular, damage to the postero-lateral structures (to the rear side of the outer aspect of the knee) leads to instability, and the damage may be to one or several of:
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