Hyperextension of the knee, also known as “genu recurvatum” occurs when the leg excessively straightens at the knee joint, putting stress on the knee structures and the back of the knee joint.

Genu valgum, known as knock-knees, is a knee misalignment that turns your knees inward. When people with knock-knees stand up with their knees together, there’s a gap of 3 inches or more between ...