Chapter 66: Musculoskeletal System Assessment

Muscle physiology is explored through the sarcomere unit, neuromuscular junction mechanics involving acetylcholine release, and contractile processes differentiated as isotonic versus isometric contractions powered by ATP and creatine phosphate systems. The chapter emphasizes distinguishing normal age-related changes like decreased bone density and muscle mass from pathological conditions such as osteoporosis, osteoarthritis, and rheumatoid arthritis through systematic assessment approaches. Subjective data collection focuses on pain patterns, functional limitations, trauma history, and medication effects, while objective examination incorporates inspection techniques, palpation for abnormalities, range of motion measurement using goniometry, and muscle strength evaluation using standardized grading scales. Diagnostic modalities are thoroughly reviewed including imaging studies like radiography and magnetic resonance imaging, laboratory analyses measuring bone markers and inflammatory indicators, and specialized procedures such as arthroscopy and electromyography for detailed tissue evaluation. The chapter concludes by establishing nursing responsibilities in diagnostic preparation, complication monitoring, and patient education, creating a systematic approach to musculoskeletal assessment that supports accurate clinical decision-making and safe patient care in medical-surgical nursing practice.