Weakness of the waist and knees is kidney yang deficiency in Chinese medicine, while in Western medicine, it is mainly due to the decline of muscle strength and bone problems, such as osteoarthritis and osteoporosis. In terms of quantitative indicators, we can check MRI to clarify whether there is arthritis or lumbar disc herniation, and we can also check bone density to clarify whether there is osteoporosis, and then we can take further treatment. Treatment includes Western medicine and Chinese medicine. Western medicine includes oral calcium, active vitamin D, bisphosphonates, salmon calcitonin analogs, and synthetic parathyroid hormones. From Chinese medicine, a number of herbs and Chinese medicines, including strong bone capsules, can be used for treatment.