What tends to go wrong with knees
The knee is a hinge that depends on four main ligaments for stability, two menisci for cushioning and the thigh muscles for control. Injuries usually follow a twist or impact, while kneecap pain and osteoarthritis tend to build up gradually.
- Anterior cruciate ligament (ACL) injuries, often a twist or awkward landing with a pop, rapid swelling and a knee that feels unstable
- Meniscus tears, causing pain along the joint line, swelling, and sometimes catching or locking when the knee bends and straightens
- Patellofemoral pain around or behind the kneecap, brought on by stairs, squatting, kneeling or sitting for long periods with knees bent
- Knee osteoarthritis, with stiffness after rest, aching when walking or climbing stairs and occasional swelling
