| Term | Definition |
| abduction | Moving a body part away from the midline of the body |
| adduction | Moving a body part toward the midline of the body |
| ambulation | The act of walking |
| atrohphy | The decrease in size or a wasting away of tissue |
| contracture | The lack of joint mobility caused by abnormal shortening of a muscle |
| dorsiflixion | Bending the tows and foot up at the ankle |
| extension | Straightening a body part |
| external rotation | Turning the joint outward |
| flexion | Bending a body part |
| footdrop | The foot falls down at the ankle; permanent plantar flexion |
| hyperextension | Excessive straightening of a body part |
| internal rotation | Turning the joint inward |
| orthostatec hypotension | Abnormally low blood pressure when the person suddenly stands up; postural hypotension |
| plantar flexion | The foot is bent; bending the foot down at the ankle |
| postural hypotension | Orthostatic hypotension |
| pronation | Turning the joint downward |
| range of motion (ROM) | The movement of a joint to the extent possible without causing pain |
| rotation | Turning the joint |
| supination | Turning the joint upward |
| Active range of motion exercises | are done by the person |
| passive range of motion exercises | another person moves the joints |
| Active assistive range of motion exercises | the person does the exercises with some help from another |