Which of the following is NOT classified as a foot injury?

The patella, commonly known as the kneecap, is classified as a component of the knee structure and not related to foot injuries. It serves a critical function in the biomechanics of the knee but does not have any direct association with injuries specific to the foot.

Ankle sprains, plantar fasciitis, and fractured toes all pertain directly to issues affecting the foot or lower extremities. Ankle sprains involve the ligaments around the ankle joint, plantar fasciitis is an inflammation of the tissue along the bottom of the foot, and fractured toes are injuries to the bones in the toes themselves. Each of these conditions impacts the foot and its function in mobility and support, whereas the patella's connection is solely to the knee.