Hyperextension Knee Exercises

Knee hyperextension occurs when the lower leg extends in a way that causes the leg to bow backward at the knee. A hyperextension could be the result of injury, such as a fall or landing incorrectly, or congenital weaknesses in the muscles that support the knee. Hyperextension causes misalignment in the kneecap and can damage the ligaments and tendons within the knee. Exercises can help strengthen the muscles that support the knee and relieve some of the symptoms of hyperextension, such as pain and difficulty walking. Consult a physician before beginning any exercise program or if you experience persistent pain as a result of a hyperextension.

Hip Flexion

The hip flexion exercise strengthens the quadriceps muscles, which extend the lower leg and support the knee, according to the "Physiology of Sport and Exercise." Lie on your back, with your hands at your sides, knees bent and the soles of your feet flat on the floor. Straighten your right leg so your right heel is approximately 6 inches off the floor. Raise your right foot toward the ceiling, as far as is comfortable, then lower it back to within 6 inches of the floor. Repeat eight times and switch to the other leg. For more intensity, try both legs at once. For less intensity, bend your knee slightly and let the heel of your foot touch the floor.

Leg Extensions

Leg extensions strengthen the inner thigh and quad, according to "The Physiology of Sport and Exercise." Adjust a leg extension machine to your height, per manufacturer's instructions. Sit at the machine with your knees bent 90 degrees, in line with the pivot point, and with the resistance roller resting on the top of your feet. Add 5 pounds to the weight stack and extend both of your legs until your calves are parallel to the floor. Pause for one second, then return your legs to the start position. Push the weight back up just before the weight stacks touch. Repeat eight times. For more intensity, add more weight in 5-pound increments, up to 40 pounds. For less intensity, remove all the weight.

Hamstring Curls

Hamstring curls strengthen the muscles on the back of the thigh, which flex the lower leg, according to "The Physiology of Sport and Exercise." Adjust the hamstring machine to your height, per manufacturer's instructions. Sit at the machine with your legs extended and the tops of your heels resting on the resistance roller. Some machines may have a brace that rests on the thighs, just above the knee. Add 5 pounds to the weight stack and bend your knees until the soles of your feet are parallel to the floor. Pause for one second, then release, slowly, until the weight stacks almost touch, then bend your knees again. Repeat eight times. For more intensity, add more weight in 5-pound increments, up to 40 pounds. For less intensity, remove all the weight.