膝关节置换术是一项重大手术，因此通常仅在其他治疗方法（例如物理疗法或类固醇注射）不能减轻疼痛或改善活动能力时才建议使用。
Knee replacement is a major operation, so it is usually recommended only when other treatments (such as physical therapy or steroid injections) cannot reduce pain or improve mobility.
