Biology, Genetics & Bone Healing MCQs

In the evaluation of a patient with suspected Paget's disease of bone, which of the following serum laboratory profiles is most classic for an active, uncomplicated disease state?

Infantile malignant osteopetrosis is most commonly associated with a mutation in which of the following genes, resulting in defective osteoclast function?

A 72-year-old female with symptomatic Paget's disease is treated with a nitrogen-containing bisphosphonate. What is the primary molecular target of this medication?

Histological evaluation of a bone biopsy from a patient with Paget's disease shows a mosaic pattern of lamellar bone with prominent cement lines. This represents which phase of the disease?

Which of the following is the only potentially curative treatment for infantile malignant osteopetrosis?

A 70-year-old man complains of increasing hat size and hearing loss. A skull radiograph is obtained.

Which of the following classic radiographic signs is most likely to be seen in the early stage of this cranial disease?

What are the typical serum calcium, phosphorus, and alkaline phosphatase levels in a patient with adult-onset (autosomal dominant) osteopetrosis?

The TRPS1 gene encodes a zinc-finger transcription factor. Its mutation primarily affects the development of which of the following tissue types?

When performing a total hip arthroplasty in a patient with advanced Paget's disease of the proximal femur, the surgeon should be highly prepared for which of the following intraoperative technical challenges?

While the exact etiology of Paget's disease is debated, inclusion bodies found within the osteoclasts of Pagetic bone have ultrastructural similarities to which family of viruses?

A 68-year-old man presents with progressive anterior bowing of his tibia and an enlarging hat size. Laboratory studies show markedly elevated alkaline phosphatase with normal serum calcium and phosphorus levels. What additional laboratory finding is most specific for evaluating the primary active disease process in this patient?

Electron microscopy of abnormal bone cells in a patient with osteitis deformans often reveals intranuclear inclusion bodies. These inclusions most closely resemble the nucleocapsids of which of the following virus families?

A 74-year-old woman with a known history of polyostotic Paget's disease undergoes a bone biopsy to rule out malignancy. If the biopsy is taken from an area in the 'mixed phase' of the disease, what is the classic histologic hallmark?

A neonate is diagnosed with an autosomal recessive form of osteopetrosis. Subsequent evaluation reveals concomitant renal tubular acidosis and cerebral calcifications. A mutation in the gene encoding which of the following enzymes is most likely responsible?

A bone biopsy is performed on a patient with diffuse skeletal osteosclerosis and a history of recurrent fractures. Histologic examination reveals unresorbed islands of calcified cartilage surrounded by mature lamellar bone. What is the primary diagnosis?

A 65-year-old patient with symptomatic Paget's disease is treated with intravenous zoledronic acid. Which of the following describes the primary cellular mechanism of action of this medication?