What type of joint is the tibiofemoral joint?

• A. Modified hinge joint
• B. Ball-and-socket joint
• C. Pivot joint
• D. Hinge joint

Answer: (A)

The tibiofemoral joint is best described as a modified hinge joint. Its primary movement is flexion and extension, like a door hinge, between the femur and tibia. But the knee isn’t a pure hinge because the articular surfaces (the femoral condyles on the tibial plateau) and the supporting structures (menisci, ligaments, and surrounding tissues) allow a small amount of rotation and gliding, especially when the knee is flexed. This combination of dominant hinge motion with a bit of rotation is what makes it a modified hinge joint rather than a simple hinge, a true ball-and-socket, or a pivot joint. The extra rotation is part of normal knee function and is crucial for activities like unlocking the knee from full extension and adjusting during gait.