Elderly people’s legs are caused by osteoarthritis, rheumatoid arthritis, osteoporosis and so on. 1. Older people’s bowlegs are usually caused by osteoarthritis, after years of age, bone joint degeneration and proliferation, articular cartilage wear and tear, joint space narrowing, which will cause changes in the lower limb force line over time, and gradually develop into bowlegs, early bowlegs need to avoid excessive weight bearing on the knee joints to slow down the development of the disease. 2. Rheumatoid arthritis, random development of the disease can appear joint deformation, the medial joint gap becomes obviously narrow, and gradually develops into rotund legs. 3. Osteoporosis, severe osteoporosis due to bone loss, bone deformation will occur, and develop into rotund legs. When the above conditions occur, you need to go to the orthopedic department, and if combined with other discomforts, you need timely treatment.