The meniscus or commonly called “cartilage” of the knee are two horse shoe shaped discs between the ends of the bones in your knee.
They function as “shock absorbers” much like a small bit of plastic washer in any artificial metal joint.
When they tear they get trapped in between the ends of the bones when the knee moves. This causes pain & “locking”
“Locking of the knee” due to meniscal tear means not being able to fully straighten the knee but bending the knee is possible. It is possible for the patient to learn manoeuvres over time to “unlock” the knee.
“locking” due to small bits of bone/ cartilage which are free in the joint (loose bodies) cause the knee to “Jam” i.e, neither able to straighten nor bend the knee and the knee is just fixed in this position
When seen during Arthroscopy of the knee or “key Hole” operation of the knee the meniscus looks like this:
For actual video taken during real life arthroscopy of the Knee click on the link below:
(please note link may not work on mobile devices)