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Question 1
Technetium-99m bone imaging relies on binding to what structure to visualize high bone turnover?
Correct Answer:
It binds to hydroxyapatite and shows areas of high bone turnover
Explanation:
Tc-99m bone imaging uses diphosphonate radiotracers that attach to hydroxyapatite crystals in bone. These tracers have a strong affinity for exposed hydroxyapatite surfaces, so they localize where bone remodeling and turnover are high. Areas of active osteoblastic activity—such as healing fractures, metastases, osteomyelitis, or inflammatory arthritis—accumulate more tracer and appear as hot spots on the scan. The uptake mechanism is tied to binding to hydroxyapatite, not to white blood cells, plasma proteins, or inflammatory cytokines, which is why those processes don’t explain the imaging pattern.
Question 2
Which polydactyly type is the most common?
Correct Answer:
Postaxial polydactyly
Explanation:
Polydactyly is classified by where the extra digit appears relative to the central axis of the hand or foot. The most common form occurs on the ulnar side of the hand, producing an extra little finger or digits on the side opposite the thumb. This is the postaxial type. Epidemiology across populations shows that postaxial polydactyly is far more frequent than the other forms, which are much rarer. Central (or mesaxial) polydactyly happens infrequently, and preaxial polydactyly (on the thumb side) is less common overall than postaxial. So the postaxial form best matches the typical presentation and is the correct choice.
Question 3
During the Lapidus procedure, which structure is most at risk?
Correct Answer:
Flexor Hallucis Longus
Explanation:
The important idea here is how the first tarsometatarsal (TMT) joint is accessed during a Lapidus procedure. To fuse this joint, the surgeon works around the base of the first metatarsal and the medial cuneiform, where the flexor hallucis longus tendon travels toward the plantar aspect of the foot to reach the distal phalanx of the big toe. Because this tendon courses right in the area of exposure and is encountered, retracted, or manipulated during the procedure, it is most at risk for injury or irritation. The other tendons mentioned are not as closely involved in the surgical corridor for the 1st TMT fusion, so they’re less at risk.
Question 4
Sesamoids in the foot function as pulleys for which muscle?
Correct Answer:
Flexor Digitorum Brevis
Explanation:
Sesamoid bones under the first metatarsophalangeal joint act as pulleys to redirect the pull of the muscle that flexes the big toe. The tendon of flexor hallucis brevis runs around these two sesamoids as it crosses the MTP joint, so the sesamoids change the line of pull and increase the tendon’s moment arm. This setup improves mechanical advantage for flexing the big toe and reduces friction during toe-off in gait. The other muscles listed don’t use these sesamoids in the same pulley-like way. Flexor digitorum brevis and flexor digitorum longus act on the other toes, and abductor hallucis is involved in abduction of the big toe rather than flexion at the MTP joint via the sesamoids.
Question 5
What is the term for transverse magnetization decay?
Correct Answer:
T2
Explanation:
Transverse magnetization decay is described by T2 relaxation. After excitation, spins lose phase coherence with each other due to spin–spin interactions, and the transverse signal decays exponentially with time constant T2. This decay is intrinsic to the tissue and largely independent of magnetic field inhomogeneities. In real imaging, extra dephasing from field inhomogeneities adds to this decay, giving the apparent rate T2*, which is always faster than T2. Other relaxation processes include T1, which is the recovery of longitudinal magnetization along the main field, and T1rho, relaxation in the rotating frame during a spin-lock. So the term for transverse magnetization decay is T2.
Question 1
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About this Exam

Prepare with the ABFAS Boards – Rearfoot and Forefoot Practice Test practice quiz. This question bank includes 10 questions covering bone, imaging, structure, orthotic, and heel. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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ABFAS Boards – Rearfoot and Forefoot Practice Test

This practice set contains 10 questions from the matching question bank and focuses on bone, imaging, structure, orthotic, and heel. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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