1. General Principles & Basic Science MCQs

In normal articular cartilage, the fluid component relies on interaction with which specific molecule to maintain tissue hydration and resistance to compressive loads?

According to Perren's strain theory, which type of tissue will primarily form in a fracture gap subjected to 5% to 10% strain?

The pullout strength of a cortical bone screw is most directly proportional to which of the following design parameters?

During the development of a periprosthetic joint infection, bacteria adhere to the implant surface and begin to communicate via signaling molecules to coordinate gene expression and biofilm maturation. This communication process is known as:

In normal articular cartilage, the highest concentration of proteoglycans and the lowest water content are found in which of the following zones?

A patient with a congenital disorder presents with multiple fractures, anemia, and cranial nerve palsies. Radiographs show a "bone-within-a-bone" appearance and diffuse sclerosis. The primary cellular defect involves an inability to produce an acidic extracellular environment due to a mutation affecting:

A nerve injury resulting in complete disruption of the axon and its myelin sheath, but preservation of the endoneurium, perineurium, and epineurium, is classified as:

A 32-year-old woman presents with knee pain. Radiographs reveal an eccentric, lytic epiphyseal lesion in the proximal tibia. Biopsy shows multinucleated giant cells in a background of mononuclear stromal cells. The neoplastic cells in this lesion primarily express which of the following?

Placing a stainless steel screw through a titanium plate in an orthopaedic construct can lead to accelerated degradation of the less noble metal. This phenomenon is known as:

A 68-year-old man has bowing of his tibiae and an increasing hat size. Radiographs show cortical thickening and coarse trabeculae. Histologic evaluation of his affected bone is most likely to show:

A viscoelastic material, such as a tendon or ligament, is subjected to a constant, prolonged load. Over time, the material continues to deform despite the load remaining unchanged. This biomechanical property is known as:

In orthopedic biomechanics, which of the following terms best describes the time-dependent increase in strain of a viscoelastic material under a constant applied stress?

Articular cartilage is a complex tissue uniquely suited for joint loading. What is the primary functional role of aggrecan in the extracellular matrix of cartilage?

Rigid plate fixation of a transverse diaphyseal fracture using absolute stability principles primarily results in which type of bone healing?

Which of the following cell types primarily expresses RANKL, a crucial cytokine for the regulation of osteoclast differentiation and activation?

During rehabilitation, a patient slowly lowers a weight from a flexed elbow position, lengthening the active biceps brachii muscle. This is an example of which type of muscle contraction?

A 55-year-old man presents with an acutely swollen, red, and painful knee. Arthrocentesis yields cloudy fluid with a white blood cell count of 85,000 cells/mm3 and 90% polymorphonuclear leukocytes. What is the most appropriate next step in management?

A 30-year-old woman presents with knee pain. Radiographs show an eccentric, lytic epiphyseal-metaphyseal lesion of the proximal tibia. Biopsy shows multinucleated giant cells in a mononuclear stroma. Denosumab therapy, used for un-resectable cases, targets which molecule?