HL Pre-class: B3.3.7— Range of motion of a joint.

How does the depth of the socket influence the function of a ball-and-socket joint?

• A shallower socket increases stability but reduces overall range of permitted movement.

• A reinforced socket increases stability but reduces overall range of permitted movement.

• A narrower socket increases stability but reduces overall range of permitted movement.

• A deeper socket increases stability but reduces overall range of permitted movement.

What feature allows ball-and-socket joints to perform movements such as rotation and circumduction?

• A rounded head sitting inside a socket enabling motion across multiple possible axes.

• A widened head sitting outside a socket enabling motion across multiple possible axes.

• A flattened head pressing against a socket enabling motion across multiple possible axes.

• A compressed head resting near a socket enabling motion across multiple possible axes.

Why is shoulder dislocation more common than hip dislocation?

• The shoulder has a reinforced socket that increases mobility while decreasing stability.

• The shoulder has a shallower socket that increases mobility while decreasing stability.

• The shoulder has a deeper socket that increases mobility while decreasing stability.

• The shoulder has a narrower socket that increases mobility while decreasing stability.

Which feature of a hinge joint most directly limits its movement to a single axis?

• A bone end wrapped around a spherical head that restricts sideways rotational motion.

• A bone end wrapped around a flattened head that restricts sideways rotational motion.

• A bone end wrapped around an angled head that restricts sideways rotational motion.

• A bone end wrapped around a cylindrical head that restricts sideways rotational motion.

Why is the hinge joint compared to a door hinge in describing its movement?

• It allows flexion and extension only, similar to how a door opens and closes in a single direction.

• It allows abduction and adduction only, similar to how a door swings outward in divided directions.

• It allows rotation and circumduction only, similar to how a door can pivot freely in rounded directions.

• It allows gliding and rotation only, similar to how a door slides sideways in restricted directions.

Which statement best explains why the elbow does not permit rotation like the shoulder?

• Its pivot structure restricts movement to flexion and extension, preventing any rotational motion.

• Its hinge structure restricts movement to flexion and extension, preventing any rotational motion.

• Its saddle structure restricts movement to flexion and extension, preventing any rotational motion.

• Its planar structure restricts movement to flexion and extension, preventing any rotational motion.

Which statement correctly contrasts a hinge joint with a ball-and-socket joint?

• Both hinge and ball-and-socket joints allow the same full range of motion in all directions, but hinge joints require stronger ligaments to prevent dislocation.

• A ball-and-socket joint functions only as a pivot for rotational movement, whereas a hinge joint acts as a fixed support where bones cannot move relative to each other.

• A hinge joint permits movement primarily in one plane (flexion/extension), whereas a ball-and-socket joint allows movement in multiple planes including rotation, abduction/adduction, and flexion/extension.

• A hinge joint allows movement in multiple directions including rotation and lateral movement, while a ball-and-socket joint restricts movement to only flexion and extension to provide stability.

Which set of movements can be measured when assessing the range of motion of the human hip joint?

• Only rotation and gliding, because the hip joint is fixed in a socket and cannot move through flexion or abduction without dislocation.

• Flexion, extension, abduction, adduction, and rotation (internal and external).

• Flexion and extension only, because ball-and-socket joints restrict side-to-side or rotational movements for stability.

• Abduction, adduction, lateral displacement, and sliding — but not flexion or rotation, because the hip joint structure prevents such motions.

A student uses a goniometer to measure the range of motion (ROM) of the hip of two athletes. The data are shown in the table.

Which conclusion is best supported by the data?

• Athlete B demonstrates higher hip flexibility than Athlete A because the smaller ROM values indicate tighter control and therefore greater functional stability during complex movements.

• Athlete A and Athlete B show identical ranges of motion, suggesting that hip joint structure has minimal influence on the measurable differences observed in flexion or rotation.

• Athlete B demonstrates superior rotational ability compared with Athlete A, because although the ROM values are numerically smaller, they indicate more efficient rotational mechanics in the hip joint.

• Athlete A demonstrates a greater overall hip mobility than Athlete B across all measured dimensions, indicating that Athlete A likely has fewer restrictions in both flexion-based and rotation-based movements.