1. General Principles & Basic Science MCQs

Osteocalcin is the most abundant non-collagenous protein in bone matrix and serves as a marker of osteoblast activity. Its ability to bind calcium and regulate mineralization is dependent on a post-translational modification requiring which vitamin?

Bone Morphogenetic Proteins (BMPs), such as BMP-2 and BMP-7, play pivotal roles in osteoblast differentiation and fracture healing. Which intracellular signaling pathway is primarily activated upon BMP binding to its cell surface receptors?

Which of the following cells secretes osteoprotegerin (OPG) to regulate bone resorption?

In articular cartilage, which zone has the highest concentration of water and collagen, but the lowest concentration of proteoglycans?

The phenomenon where an orthopaedic biomaterial subjected to a constant load exhibits a progressive increase in strain over time is known as:

The predominant blood supply to the adult femoral head arises from the deep branch of the medial femoral circumflex artery (MFCA). This vessel courses between which two muscles to reach the joint capsule?

Which of the following intracellular signaling molecules is directly phosphorylated upon binding of Bone Morphogenetic Protein-2 (BMP-2) to its serine/threonine kinase receptor?

Secondary bone healing differs from primary bone healing primarily due to the formation of:

Which of the following factors is the primary driving force for galvanic corrosion when two dissimilar metals are implanted in the body?

Sclerostin, a protein that negatively regulates bone mass, achieves its effect primarily by inhibiting which of the following signaling pathways?

The posterior interosseous nerve (PIN) enters the posterior compartment of the forearm by passing between the two heads of which muscle?

Which enzyme is responsible for the final conversion of 25-hydroxyvitamin D to its most active form, 1,25-dihydroxyvitamin D?

On a stress-strain curve representing an orthopaedic biomaterial, the area under the elastic region is defined as:

Increasing the working length of a locked plating construct by leaving empty screw holes over the fracture site has what biomechanical effect?

Teriparatide, a recombinant human parathyroid hormone (PTH) analog, promotes bone formation primarily through which mechanism?

Pullout strength of a cortical screw is most heavily influenced by which of the following screw design parameters?

During osteoclast-mediated bone resorption, which of the following enzymes is primarily responsible for the generation of intracellular protons required to acidify the resorption pit?

A 16-year-old male undergoes a deltopectoral approach for a proximal humerus fracture. Aggressive medial retraction of the conjoined tendon places which of the following nerves at highest risk of injury?

Which of the following best describes the phenomenon of "creep" in viscoelastic orthopaedic materials?

The corona mortis, which is at risk of iatrogenic injury during an ilioinguinal approach to the acetabulum, is typically an anastomotic connection between the obturator vessels and which of the following?