Comprehensive Osteopathic Medical Licensing Examination (COMLEX USA) Practice

The limit of end range of motion produced by the patient themselves is referred to as the physiologic barrier. This concept is essential in understanding joint movement and manipulation. The physiologic barrier represents the maximum range of motion that an individual can achieve voluntarily through their own muscular effort.

When a person attempts to move a joint through its range of motion, they will reach a point where further movement is no longer possible due to muscular tightness or other restrictions inherent to the individual’s unique physiology. This voluntary limit is where the physiologic barrier is encountered, making it crucial for evaluating the patient’s movement capabilities and for planning treatment strategies in rehabilitation.

In contrast, other barriers such as the anatomic barrier represent the limits of movement imposed by the anatomical structures in the body, such as bones, ligaments, and tendons. The effective barrier relates to the point at which a physician can apply a therapeutic force beyond the physiologic barrier. The restrictive barrier is defined as any limitation that prevents reaching the physiologic barrier, often due to pathological conditions or injuries. Understanding these barriers is important for properly assessing joint mechanics and enhancing mobility.