OCS OCS Biomechanics & Kinesiology 2

Question 1

The convex-concave rule states that when a convex surface moves on a fixed concave surface, joint glide occurs in which direction relative to bone movement?

Accepted Answer

Opposite direction

Answer

When a convex surface moves on a concave surface, the joint glide (slide) occurs in the opposite direction of the bone's angular movement.

Question 2

During the running gait cycle, which phase is absent compared to walking gait?

Accepted Answer

Double support phase

Answer

Running eliminates the double support phase seen in walking and replaces it with a float phase where neither foot is in contact with the ground.

Question 3

The center of gravity in a standing adult is located approximately at which spinal level?

Accepted Answer

S2

Answer

The center of gravity in a standing adult is located approximately anterior to the second sacral vertebra (S2).

Question 4

Which type of muscle contraction produces the greatest tension per cross-sectional area?

Accepted Answer

Eccentric

Answer

Eccentric contractions produce greater tension than isometric or concentric contractions because cross-bridge cycling is supplemented by passive elastic forces in titin.

Question 5

The subtalar joint axis of motion is oriented at approximately 42° in the sagittal plane and 16° in the transverse plane; this orientation means subtalar pronation is a triplanar motion combining:

Accepted Answer

Eversion, dorsiflexion, and abduction

Answer

Subtalar pronation is a triplanar motion consisting of calcaneal eversion, talar dorsiflexion, and forefoot abduction occurring simultaneously.

(OCS) Orthopedic Certified Specialist Practice Test

(OCS) Orthopedic Certified Specialist Practice Test

OCS OCS Biomechanics & Kinesiology 2