In the clinic, we often encounter patients, especially middle-aged and elderly women, who come to the doctor and often say, “Doctor, I have knee pain, and I have been taking calcium tablets by myself for some time, why doesn’t the pain ease?” Here, we would like to correct the notion of these patients that you may have some misconceptions about knee pain. Geriatric patients, especially middle-aged and elderly female patients, often suffer from two orthopedic diseases with a high incidence, osteoporosis and osteoarthrosis. Osteoporosis is a systemic disease in which patients suffer from calcium deficiency, resulting in reduced bone mass, increased brittleness of bones, and reduced strength of the strands. Its greatest danger is the susceptibility to osteoporotic fractures, which are most likely to occur in the hip, spine and wrist. The common clinical symptoms we see caused by osteoporosis are fractures in the above areas and generalized pain, whose pathological changes occur in the bones themselves. Old age and menopause are the most important causes of calcium loss and osteoporosis. Osteoarthrosis is a painful and limited movement of the knee joint due to degeneration of the articular cartilage, resulting in the formation of bone fragments, inflammation of ligaments and muscle attachments, inflammation of the synovial membrane, and sclerosis of the subchondral bone, with a predilection for the knee joint. The lesions occur in the joints rather than in the bones themselves, and the main clinical symptoms are knee pain and limitation of motion. In the elderly, both osteoporosis and osteoarthrosis are diseases with a high incidence, however, the incidence of osteoarthrosis is even higher than that of osteoporosis. Some of the patients mentioned earlier may have osteoarthrosis of the knee or osteoarthrosis of the knee along with osteoporosis, not just osteoporosis, so taking calcium tablets alone is ineffective or ineffective. For patients who develop knee pain, it is recommended to visit a hospital as early as possible to clarify the diagnosis, and to avoid and delay artificial joint surgery through education and health education, exercise as well as medication to alleviate the progression of osteoarthrosis and treat the symptoms of osteoarthrosis.