NCBTMB Exam Applied Science and Anatomy 6

Question 1

A massage therapist is working with a client who presents with weakness in shoulder abduction beyond 90° and difficulty with external rotation. Which specific rotator cuff muscle is most likely compromised, and what is its primary innervation?

Accepted Answer

Infraspinatus; suprascapular nerve (C5–C6)

Answer

The infraspinatus is the primary external rotator of the shoulder and is responsible for external rotation and assists in abduction beyond 90°. It is innervated by the suprascapular nerve (C5–C6). The supraspinatus initiates abduction (0–15°) and is also innervated by the suprascapular nerve, but it does not govern external rotation. Teres minor also externally rotates but is innervated by the axillary nerve, not the lower subscapular nerve. Subscapularis is an internal rotator.

Question 2

During passive range of motion assessment, a therapist notes a springy end-feel at the elbow during extension. Which of the following best explains this finding from an anatomical and pathological perspective?

Accepted Answer

Loose body or intra-articular cartilage fragment blocking full extension

Answer

A springy end-feel — a rebound sensation at the end range — is considered an abnormal finding that typically indicates a loose body or meniscal/cartilage fragment within the joint blocking full motion. Normal elbow extension exhibits a hard (bony) end-feel due to olecranon contact with the olecranon fossa. Biceps tightness would produce a soft or firm tissue end-feel. Capsular patterns at the elbow involve proportional loss of flexion and extension, not a springy rebound.

Question 3

A client presents with paresthesia along the medial forearm and medial 1½ fingers, with no motor deficits in the hand intrinsics. Cervical compression testing is negative. Which nerve and level of entrapment is most consistent with these findings?

Accepted Answer

Medial cutaneous nerve of the forearm entrapped at the medial intermuscular septum

Answer

The medial cutaneous nerve of the forearm (medial antebrachial cutaneous nerve) is a purely sensory branch of the medial cord of the brachial plexus (C8–T1) that supplies the medial forearm. Entrapment at the medial intermuscular septum produces sensory symptoms limited to the medial forearm without affecting hand intrinsics — distinguishing it from cubital tunnel syndrome, which would also cause intrinsic weakness (hypothenar, interossei) and ring/little finger paresthesia. Negative cervical compression rules out a C8 root origin. The median nerve serves the lateral palm, not medial.

Question 4

Which of the following accurately describes the physiological basis for the post-isometric relaxation (PIR) technique used in neuromuscular therapy?

Accepted Answer

The Golgi tendon organs are activated during the isometric contraction, triggering autogenic inhibition of the agonist muscle after the contraction ceases

Answer

Post-isometric relaxation is grounded in autogenic inhibition: when a muscle performs a submaximal isometric contraction, the Golgi tendon organs (GTOs) detect the tension and fire Ib afferents, which synapse on inhibitory interneurons in the spinal cord. This inhibits alpha motor neuron firing to the same muscle, producing a brief window of reduced resting tone immediately after the contraction ends. The therapist then passively stretches the muscle into this window of relaxation. Motor unit fatigue plays a minimal role. Reciprocal inhibition describes inhibition of the antagonist, not the agonist.

Question 5

A client has just undergone surgical repair of the anterior cruciate ligament (ACL) using a patellar tendon autograft. Three weeks post-op, the client reports anterior knee pain and difficulty with terminal knee extension. Which anatomical structure is most likely contributing to the extension deficit?

Accepted Answer

Scarring and adhesion formation within the infrapatellar fat pad (Hoffa's fat pad) limiting patellar mobility

Answer

Infrapatellar fat pad (Hoffa's fat pad) fibrosis is a well-recognized complication of patellar tendon graft harvesting and ACL surgery. The fat pad becomes inflamed and may develop adhesions that tether the patellar tendon and restrict inferior patellar glide, directly impairing terminal knee extension. This condition — sometimes called 'cyclops lesion' when localized to the intercondylar notch, but more broadly Hoffa's syndrome in the fat pad — is a primary cause of extension loss in early ACL rehabilitation. VMO weakness causes tracking issues but not an extension deficit per se. Hamstring guarding is common early but resolves with time; it does not cause the anterior knee pain described.

NCBTMB Exam Practice Test

NCBTMB Exam Practice Test

NCBTMB Exam Applied Science and Anatomy 6