A 65-year-old female complains of left medial knee pain. She has been told that she has arthritis in this knee. Where would the pain be located?

• A. Medially, radiating into the upper thigh
• B. Medially, along the joint line
• C. About an inch above the medial knee joint line
• D. About an inch below the medial knee joint line

Answer: (B)

Pain from knee osteoarthritis tends to be felt where the joint surfaces meet—the joint line. When the medial compartment is affected, the pain localizes along the medial joint line because the degenerative changes irritate the articular surfaces and surrounding synovium at that site. Clinically, this often presents as tenderness right along the medial aspect of the knee at the joint line, especially with weight bearing or movement.

The other locations don’t fit this pattern as well. Pain radiating into the upper thigh suggests issues elsewhere (nerve or proximal hip involvement), while pain a short distance above or below the joint line doesn’t reflect intra-articular surface pain, which centers on the joint itself.