About this video
Last updated: 9 October 2026
The video says a knee that locks when you try to move it, or catches in place, may signal a meniscal tear (a tear in the knee’s cartilage cushion). It says instability with swelling usually points to a ligament injury, such as an ACL or MCL tear.
Key points
- It says swelling often means bleeding inside the joint.
- It says sharp pain when squatting or twisting can indicate cartilage damage, either chondromalacia (softening of the cartilage under the kneecap) or early-stage osteoarthritis (wear-related arthritis).
- It describes these symptoms as pointing to mechanical problems inside the joint.
Questions this video answers
What can a locking or catching knee mean?
The video says a knee that locks when you try to move it, or catches in place, may signal a meniscal tear.
What can a knee that feels unstable and swollen mean?
The video says instability with swelling usually points to a ligament injury such as an ACL or MCL tear. It adds that swelling often means bleeding inside the joint.
