Question

Which of the following is NOT true?

1) There are 4 bones in the knee joint - femur, tibia, fibula, and patella
2) The most common cause of knee disability is osteoarthritis
3) More than 90
4) A TKA typically lasts 10-20 years

Answer 1

The incorrect statement is that four bones form the knee joint. The knee joint consists of the femur, tibia, and patella, while the fibula does not contribute to the joint but articulates with the tibia.

Step-by-step explanation:

The statement that is NOT true among the given options is that there are 4 bones in the knee joint - femur, tibia, fibula, and patella. The knee joint is formed by three bones: the femur (thighbone), tibia (shinbone), and the patella (kneecap). While the fibula (calf bone) is located in the lower leg, it does not form part of the knee joint but rather parallels and articulates with the tibia and plays a role in muscle attachment and the lateral part of the ankle joint.

The most common cause of knee disability is indeed osteoarthritis, which is a degenerative condition affecting the joint cartilages. Finally, a Total Knee Arthroplasty (TKA), typically lasts between 10-20 years, which is an expected lifespan for this type of surgical implant.