The process of recovery of function after injury, monitored via movement.Rehabilitation is the process by which a person regains movement, strength, or function after an injury, illness, or surgery. It is not a single event but a gradual course: early stages may involve simply restoring range of motion, later stages involve rebuilding strength and coordination, and the final stages involve relearning everyday tasks. Because progress is often slow and uneven, rehabilitation depends on measurement — tracking how movement changes over weeks or months to judge whether a therapy is working and to adjust it. This makes rehabilitation a natural meeting point between medicine and the quantitative study of movement, since the same joint angles, walking speeds, and muscle activations that describe healthy motion can be compared against a patient's motion to quantify recovery.
The body recovers through a combination of tissue healing and neural adaptation. Damaged tissue repairs itself over time, while the nervous system relearns motor patterns through repeated practice, gradually refining the signals that produce coordinated movement. Rehabilitation guides this process by prescribing specific, often repetitive exercises that challenge the affected system just enough to drive adaptation without causing further injury. Measuring the resulting motion — with sensors, cameras, or wearable devices — turns vague impressions of improvement into numbers that can be compared across sessions and between patients.
Motion-capture systems and wearable sensors are used in rehabilitation clinics and research to quantify gait, balance, and joint function, and to tailor exercise programs to a patient's measured progress.