FROM OUR EXPERTS
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...
Patellofemoral pain syndrome (PFPS) is a common cause of knee pain in athletes. Active teens and adults are affected most often. The exact cause of this problem remains under investigation. Studies have linked hip muscle weakness with PFPS. Weakness of the hip abductor and hip external rotator muscles may be one cause of PFPS. When there's weakness of these muscles, then there's too much hip adduction (movement toward the midline) and internal rotation. These motions put increased stress on the patellofemoral joint. A recent study by a group of physical therapists showed that the Q-angle of the knee in patients with PFPS is increased during dynamic movements. The Q-angle is a measure of the angle between the femur (thigh) and the tibia (lower leg). An increased Q-angle means there is an increased lateral pull (sideways away from the knee) of the quadriceps (thigh) muscle. In this study, changes in knee alignment during movement were measured and compared between two groups of women. One...
Alternative Names Muscular dystrophy - limb-girdle type (LGMD) Symptoms Typically, the first sign is pelvic muscle weakness (difficulty standing from a sitting position without using the arms, difficulty climbing stairs). The weakness starts in childhood to young adulthood. Other symptoms include: Abnormal, sometimes waddling, walk Joints that are fixed in a contracted position (late in the disease) Large and muscular-looking calves (pseudohypertrophy), which are not actually strong Loss of muscle mass, thinning of certain body parts Low back pain Palpitations or passing-out spells Shoulder weakness Weakness of the muscles in the face (later in the disease) Weakness in the muscles of the lower legs, feet, lower arms, and hands (later in the disease) Signs and tests Blood creatine kinase levels DNA testing Echocardiogram or ECG Electromyogram (EMG) testing Muscle biopsy
You should know
Answers to your question are meant to provide general health information but should not replace medical advice you receive from a doctor. No answers should be viewed as a diagnosis or recommended treatment for a condition. Content posted by community members does not necessarily reflect the views of Remedy Health Media, which also reserves the right to remove material deemed inappropriate.