Final answer:
A musculoskeletal complication of immobility is bedsores, which result from prolonged pressure leading to tissue necrosis and can become fatal if infected.
Step-by-step explanation:
A complication of immobility that affects the musculoskeletal system is bedsores, also known as decubitus ulcers. These occur due to constant, prolonged pressure on bony parts of the body, which impairs blood flow and leads to tissue death. Bedsores are particularly common in elderly patients with conditions that limit their mobility. To prevent bedsores, it is a common practice in hospitals and long-term care facilities to reposition patients regularly. Without proper treatment, which includes the removal of necrotic tissue, bedsores can lead to fatal infections.