why does it hurt on the inner side of my knee
Medial compartment arthritis (usually osteoarthiritis) can cause pain on the inner side of the knee. This is usually more of an ache than a sharp catching pain and is present when you walk on the leg. As the arthritis worsens the pain can become continuous and interfere with sleep.
Inner side of knee. The most common cause of medial knee pain or pain on the inside part of the knee is a medial meniscal tear. The tear can be acute or degenerative but either way can cause pain and limitation of activities. Occasionally a torn meniscus can flip in and out of the joint and cause pain as well as locking of the knee.