Biomechanics is considered one of the fundamental sciences that integrates engineering principles with medical sciences. It focuses on studying human body movement and the forces acting on it, making it a key element in diagnosis, treatment, and rehabilitation. Medical Applications of Biomechanics Biomechanics is used in several medical fields, most notably: Design and development of prosthetic limbs, ensuring compatibility with natural body movement and improving functional performance for patients. Analysis of joint and muscle injuries by understanding movement mechanisms and the mechanical loads that cause injury. Rehabilitation of stroke and fracture patients through treatment programs based on motion analysis, helping to restore motor function gradually and safely. This field helps physicians and physical therapists select the most appropriate treatment plan for each patient, based on accurate assessment of movement and applied forces, ultimately improving recovery outcomes and quality of life.