range of movement (ROM)

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range of movement (ROM)

how far a joint permits rotation of the moving parts about the axis of the joint. Usually measured in degrees or radians. Depends on the articulating surfaces, the length and elasticity of ligaments and the properties of muscle, tendon and other soft tissue surrounding the joint. Used as an index of flexibility and to assess progress in rehabilitation. For example, after repair of the anterior cruciate ligament, knee movement will be restricted and as rehabilitation progresses the ROM will increase back to normal. May be assessed by direct examination and measurement or using an isokinetic dynamometer.