What causes weak knees?


Weakness in the knees can be caused by many things, but most of the time, weak knees are symptomatic of damage to the tissue in or around the knee joint. According to the National Institute of Arthritis and Muskuloskeletal and Skin Diseases, the most common reason for weak knees is some form of osteoarthritis, a painful condition in which the knee becomes inflamed.

WebMD describes the knee joint as connecting four bones: the thigh bone (the femur), the kneecap (the patella) and the two shin bones (the tibia and fibula). There are also many ligaments and tendons that hold the joint together, and fluid and cartilage keep it cushioned. Damage to or dislocation of any of these could lead to weakness in the knees.

The knee joints have to move a lot and handle a great deal of force every day. This frequent strain often leads to pain or weakness in the knees, especially if it is exacerbated by misuse of the joint. The Neurotech Group lists 14 different general causes of knee weakness, including overuse, underuse, disease, infection, recovery from surgery and trauma, such as a blow to the patella, tendon or ligament damage. If the joints are not properly cared for, there is a risk of osteoarthritis, a major chronic condition, developing in the knees. The best way to keep your knees healthy is to actively engage in stretching and physical activity without subjecting your legs to undue strain, such as lifting objects that are too heavy or maintaining improper posture.

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