PC PC Biomechanics & Orthotics

Question 1

During normal gait, which phase involves the foot being flat on the ground with the body's center of mass directly over the foot?

Accepted Answer

Midstance

Answer

Midstance is the phase of the gait cycle when the entire foot is in contact with the ground and the body's center of mass passes over the supporting limb.

Question 2

What is the primary function of a custom foot orthosis prescribed for overpronation?

Accepted Answer

Control excessive subtalar joint eversion and medial arch collapse

Answer

Custom orthotics for overpronation are designed to limit excessive eversion of the subtalar joint and support the medial longitudinal arch, improving lower extremity alignment.

Question 3

The subtalar joint (STJ) neutral position is used as a reference point in orthotic casting. What does STJ neutral mean?

Accepted Answer

The position where the STJ is neither pronated nor supinated, with the calcaneus aligned under the leg

Answer

STJ neutral is the theoretical position where the subtalar joint is in neither pronation nor supination, used as the reference for neutral casting of functional foot orthotics.

Question 4

Which type of orthotic material is most appropriate for a patient with diabetic neuropathy requiring pressure reduction?

Accepted Answer

Accommodative orthotic with soft, cushioning materials (e.g., PPT, Plastazote)

Answer

Accommodative orthotics made from soft materials redistribute plantar pressure and reduce shear forces, critical for preventing ulceration in patients with diabetic neuropathy.

Question 5

What is the term for the abnormal inward rolling of the foot during the stance phase of gait?

Accepted Answer

Overpronation

Answer

Overpronation refers to excessive inward rolling (eversion) of the foot during stance, often associated with medial arch collapse and various lower extremity overuse injuries.

(PC) Podiatrist Certification Practice Test

(PC) Podiatrist Certification Practice Test

PC PC Biomechanics & Orthotics