1. General Principles & Basic Science MCQs

On a load-deformation curve for bone, the point at which the material transitions from elastic to plastic deformation is known as what?

In which zone of articular cartilage are the collagen fibers oriented perpendicular to the joint surface and contain the highest concentration of proteoglycans?

A surgeon utilizes demineralized bone matrix (DBM) during a spinal fusion. Which of the following best describes the inherent bone grafting properties of this material?

A patient sustains a peripheral nerve injury characterized by disruption of the axon and endoneurium, but with an intact perineurium and epineurium. What Sunderland classification corresponds to this injury?

A 30-year-old female presents with knee pain. Radiographs reveal an expansile, purely lytic lesion in the distal femur extending to the subchondral bone without a sclerotic rim. Biopsy shows multinucleated giant cells. Which targeted medication is indicated for unresectable cases?

A surgeon plans to revise a failed nonunion utilizing a stainless steel plate and titanium screws. Which of the following forms of corrosion is most likely to occur due to mixing these metals?

A 72-year-old female with severe osteoporosis is started on teriparatide. Which of the following best describes the mechanism of action of this medication?

A 65-year-old male on dabigatran for atrial fibrillation sustains a displaced femoral neck fracture. Which of the following agents is the specific reversal agent for this anticoagulant?

Which of the following best describes the primary pathologic event in the initial phase of Paget disease of bone?

During a Smith-Petersen (anterior) approach to the hip, the superficial internervous plane is developed between the sartorius and the tensor fasciae latae. Which nerves supply these two muscles, respectively?

During the gait cycle, a patient demonstrates a 'steppage gait' with exaggerated hip and knee flexion during the swing phase. This abnormality is most classically associated with weakness of muscles innervated by which of the following nerves?

What is the correct sequence of the four histological transition zones at a direct tendon-to-bone insertion (enthesis)?

An orthopedic study identifies patients with osteoarthritis and matched controls without the disease, then looks retrospectively at their lifetime history of high-impact sports participation. What type of study design is this?

During fluoroscopy, a surgeon steps back to a distance of 2 meters away from the radiation source instead of 1 meter. By what factor is the surgeon's radiation exposure reduced?

Which of the following phases of biofilm formation on an orthopedic implant is characterized by irreversible bacterial attachment and exopolysaccharide matrix production?

A 24-year-old sexually active male presents with an acute, atraumatic swollen knee. Arthrocentesis yields 65,000 WBCs/mcL with 90% polymorphonuclear cells. Pending culture results, what is the most appropriate empiric antibiotic therapy?

In the pathogenesis of Rheumatoid Arthritis, which cell type is primarily responsible for the direct destruction of articular cartilage and bone within the pannus?

Which zone of articular cartilage is primarily responsible for resisting shear stress and contains chondrocytes flattened parallel to the joint surface?

According to Perren's strain theory, what is the maximum interfragmentary strain that permits primary bone healing (cutting cone remodeling) without intermediate callus formation?