Muscle Strength, Vitamin D Deficiency and Knee Osteoarthritis

Abstract

Knee osteoarthritis (KOA) is a common and an important cause of disability in the elderly population. Muscle weakness and vitamin D deficiency are responsible factors of KOA. Both factors are also associated with knee pain. However, the results of previous studies are not consistent. Muscle weakness may develop in KOA due to pain and limitation of motion. Conversely, muscle weakness was introduced as an etiologic factor of KOA. Similarly, vitamin D deficiency is also common in elderly population. At present it is not possible to conclude whether muscle weakness is as a cause or a consequence of KOA. This study by reviewing available data recommends further studies in context of muscle strength and KOA. Future studies should address the relationship between KOA and muscle strength regarding serum vitamin D status.

Keywords

• knee osteoarthritis
• vitamin d deficiency
• muscle weakness
• relationship