There is a particular frustration in feeling pain at the back of your knee, especially when you cannot fully bend or extend without that deep, aching pinch. You may have been told to rest, apply ice, and do some generic stretching.

A posterior knee capsule tear places you in a particular kind of limbo. The injury is painful enough to stop daily activity, but the standard care pathway — rest, some ice, a physiotherapy referral, maybe an MRI — rarely explains why it happened or why recovery is slower for some people than others.

If your knees hyperextend — if they lock back past straight whenever you stand or bear weight — you probably know the feeling of being told to simply strengthen your quadriceps and wear a brace when things get bad.