NBCOT Biomechanics, Kinesiology, and Musculoskeletal Function

Question 1

During manual muscle testing (MMT), a muscle grade of 3/5 indicates the muscle can:

Accepted Answer

Move through full ROM against gravity with no added resistance

Answer

Move through partial ROM against gravity with some added resistance

Answer

Move through full ROM only with gravity eliminated

Answer

Show a visible or palpable contraction but produce no joint movement

Question 2

The glenohumeral (shoulder) joint is classified as which type of synovial joint, allowing movement in multiple planes?

Accepted Answer

Ball-and-socket joint

Answer

Hinge joint

Answer

Pivot joint

Answer

Condyloid joint

Question 3

A client demonstrates wrist drop following a radial nerve injury. Which muscle group is MOST affected?

Accepted Answer

Wrist extensors

Answer

Wrist flexors

Answer

Intrinsic hand muscles

Answer

Finger flexors

Question 4

When teaching body mechanics to a client with low back pain, the OT instructs the client to pivot the feet when changing direction rather than twisting the trunk. This primarily addresses which biomechanical principle?

Accepted Answer

Eliminating rotational/torsional forces on the lumbar spine

Answer

Reducing compressive forces on spinal discs

Answer

Maximizing mechanical advantage of the erector spinae

Answer

Increasing base of support during lifting

Question 5

Passive range of motion (PROM) differs from active range of motion (AROM) in that PROM:

Accepted Answer

Is produced entirely by an external force without voluntary muscle contraction

Answer

Requires greater muscle strength to perform

Answer

Results in greater joint mobility than AROM in healthy individuals

Answer

Is contraindicated whenever joint inflammation is present

Question 6

A client has a weak serratus anterior muscle. Which functional deficit would the OT MOST likely observe during an activity requiring arm elevation?

Accepted Answer

Winging of the scapula during arm elevation

Answer

Inability to supinate the forearm

Answer

Reduced elbow flexion strength

Answer

Difficulty with wrist extension against resistance