Anatomic Barrier limits which ROM?

• A. Limits active ROM
• B. Perceived quality of motion
• C. Limits passive ROM
• D. A factor that restricts motion

Answer: (C)

The main idea is that end-range restriction due to the body's own structures sets the limit for passive motion. The anatomic barrier is reached when the joint’s nonelastic tissues—like ligaments, joint capsule, or even bone contact—restrict further movement as you move the joint passively. It marks the limit of passive ROM, not active ROM, because active movement is governed by muscle activation and control. If passive ROM hits this barrier, the restriction is structural or soft-tissue in nature. A person’s perceived quality of motion or a vague statement like “a factor that restricts motion” don’t pinpoint this specific, tissue-based end range. So the anatomic barrier limits passive ROM.