A wide range of medical conditions can lead to weakness and pain in the knees after working out. Disease and injuries that commonly affect knees during exercise include hip weakness, arthritis, skin splints and runner's knee. Walking or running on a treadmill places stress on the knees and often is associated with the source of the chronic weakness.
Hip Abductor Weakness
The severity and duration of the weakness depends on how you use the treadmill and how long you work out. Knee weakness due to hip abductor frailty varies, according to how often and how fast you run on the treadmill, your height, age and body-fat ratio, as well as your running techniques. Women are more prone to experience knee problems due to hip abductor weakness. Weakness in the hip may be due to loss of bone mass, previous injuries, incorrect running techniques or overuse.
Arthritis
One of the most common places that osteoarthritis hits is in the knees, according to the American Academy of Orthopaedic Surgeons. Arthritis is a degenerative disease in which the cartilage between the ball of the knee and socket wears away, leaving a knee joint that has bone rubbing against bone. Your knees will feel weak and painful after a session on the treadmill when you have arthritis. Rheumatoid arthritis occurs following an inflammatory infection. RA typically affects both knees, leaving you weak and worn out after walking or running.
Shin Splints
Walking on a treadmill when you have shin splints leaves your knees weak from compensating for the pain that runs along your shins. The shinbone is the tibia, or large bone in the front of your lower leg. Improper walking techniques, poor shoe fit, weak leg muscles and tight calves can lead to the pain and weakness in your shins that radiates to your knees. The stress you place on your weakened shins radiates down from your knees to your ankles and can cause them to feel tender and sore. Shin splints usually are most apparent first thing in the morning and when you first begin your treadmill workout before your muscles have had time to stretch and warm up.
Runner's Knee
Runner's knee is a broad term used to describe a variety of medical complications ranging from chondromalacia patella to anterior knee pain syndrome. The weakness starts with a dull aching throb in the front of your knee, or patella. People with flat feet often develop runner's knee and those with abnormal bone development are prone to the condition. You may have dislocated your knee and don't feel the weakness until after you've placed stressed on it while walking or running on the treadmill. Extensive treadmill use can lead to runner's knee.
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