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Do your knees feel wobbly or are your legs giving way? If you answered yes to either one of these questions, then you might be experiencing a condition known as Arthrogenic Muscle Inhibition. That’s a fancy way to say that the muscle weakness is caused by joint arthritis, injury and pain.
As a protective mechanism, the nervous system has reflexes that shut down muscle activity in order to protect the injured body part. In the case of an injured knee, ankle or other joint, doctors have observed significant muscle deactivation in response to joint swelling, pain, and arthritis. 1
In response to knee injury, surgery or arthritis, the quadriceps muscles become very weak. Even the hamstring and buttocks muscles are weakened in order to protect the knee. In response to an ankle injury or other painful process, the lower leg muscles in the calf start to lose their power. Researchers are even able to duplicate this arthrogenic muscle response by simulating joint swelling a...
The list of tips for sore feet is not complete without mentioning the butt muscles. This group of muscles may be the laziest in the entire body. When the butt muscles become weak, the entire leg is affected, including the feet. Everything starts to turn inward. The thigh bone rotates inward causing "knock-knees." The ankles turn inward to the point that the arch of the foot can become plastered to the ground. This misalignment of the leg leads to a chain reaction of chronic pain.
Anyone with back, hip, knee, ankle, or foot pain should remember to strengthen the butt muscles. The easiest and most practical way to improve strength in the buttocks is to stand on one leg. Go ahead and try it (if needed, hold onto a chair for safety). Your beltline should remain parallel to the ground and your body should remain upright. If that was difficult, try it again only this time focus on tightening the butt cheek on the same side you are standing on. Once the butt muscles engage, the leg be...
Studies show muscle weakness after total knee replacement (TKR) is common months and even years after the surgery. This study compares the force produced during a single-leg press after TKR. Nine patients with TKR were compared to nine adults without TKR (the control group). This is the first study to measure force produced by the leg after TKR in a weight-bearing position. It's unique because force is examined across several joints using many muscle groups. This gives a better idea of what's going on in a fully weight-bearing position. Other studies have reported on forces in one joint at a time. Often only the knee extensor muscles are tested. The authors report that there is much less force through the leg with the joint replacement. These measures were lower when compared to the patient's healthy leg and when compared to the control group. This shows that the entire leg, not just one set of muscles, has less power. The researchers suggest that the loss of force in the leg with the TK...
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