Comprehensive Osteopathic Medical Licensing Examination (COMLEX USA) Practice

Which type of barrier results from exceeding the patient's range of motion in passive assessment?

1. Anatomic barrier

2. Effective barrier

3. Physiologic barrier

4. Restrictive barrier

The correct answer is: Anatomic barrier

The anatomic barrier is the limit of passive motion, determined by the anatomical structures such as ligaments, tendons, and joint capsules. This barrier is typically reached when any further movement could potentially injure the tissue or joint. When the assessment exceeds the patient’s range of motion, it implies that the practitioner is testing the limits of the anatomical structures that protect against injury. To provide some context, the physiologic barrier defines the range of motion available under voluntary muscle control. If a practitioner attempts to assess beyond this point, they are moving into the realm of the anatomic barrier. The effective barrier typically refers to the most advantageous position for treatment or assessment, which may vary based on the individual’s condition. The restrictive barrier indicates limitations caused by pathological factors or conditions that restrict the patient from reaching their full physiologic barrier. In this case, exceeding the range indicates assessment into anatomical limitations, solidifying the choice of the anatomic barrier.