Surgical Considerations in Metabolic Bone Diseases Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Surgical Considerations in Metabolic Bone Diseases. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Surgical Considerations in Metabolic Bone Diseases Indian Medical PG Question 1: What is the gold standard for the diagnosis of osteoporosis?
- A. Dual energy X-ray absorptiometry (Correct Answer)
- B. Single energy X-ray absorptiometry
- C. Ultrasound
- D. Quantitative computed tomography
Surgical Considerations in Metabolic Bone Diseases Explanation: ***Dual energy X-ray absorptiometry***
- **DXA** is the current **gold standard** for diagnosing osteoporosis and assessing fracture risk due to its high precision and accuracy in measuring **bone mineral density (BMD)**.
- It measures BMD at clinically relevant sites such as the **lumbar spine** and **hip**, providing T-scores and Z-scores for comparison.
*Single energy X-ray absorptiometry*
- **SXA** measures BMD at peripheral sites but is **less accurate** and comprehensive than DXA for diagnosing osteoporosis.
- It has **limited utility** as a diagnostic tool for osteoporosis at the hip or spine, which are critical sites for fracture risk.
*Ultrasound*
- **Quantitative ultrasound (QUS)** can assess bone quality but is primarily used for **screening** and is not accurate enough for definitive diagnosis or treatment monitoring of osteoporosis.
- It does **not provide direct bone mineral density measurements** comparable to DXA for diagnostic purposes.
*Quantitative computed tomography*
- **QCT** can measure volumetric bone density and is useful for assessing **trabecular bone**, but involves higher radiation exposure than DXA.
- It is **more expensive** and less readily available than DXA, making it a secondary option for osteoporosis diagnosis.
Surgical Considerations in Metabolic Bone Diseases Indian Medical PG Question 2: All statements are true for osteomalacia except:
- A. Raised serum calcium (Correct Answer)
- B. Muscular weakness
- C. Loosers zone on X-ray
- D. Commoner in females
Surgical Considerations in Metabolic Bone Diseases Explanation: ***Raised serum calcium***
- **Osteomalacia** is characterized by defective **bone mineralization**, predominantly due to **vitamin D deficiency** (or abnormal metabolism) or phosphate deficiency [1].
- This typically leads to **hypocalcemia** (low serum calcium), not elevated calcium, as vitamin D is essential for calcium absorption from the gut [1], [3].
*Muscular weakness*
- **Proximal muscle weakness**, particularly in the thighs and pelvic girdle, is a common symptom of **osteomalacia** [1].
- This **myopathy** is thought to be directly related to **vitamin D deficiency** and the resulting metabolic disturbances affecting muscle function [1].
*Looser's zone on X-ray*
- **Looser's zones**, also known as **pseudofractures**, are characteristic radiological findings in **osteomalacia** [2].
- These are areas of **unmineralized osteoid** that appear as radiolucent bands perpendicular to the bone cortex, often found in the femoral neck, pubic rami, or ribs [2].
*Commoner in females*
- **Osteomalacia** is indeed more common in **females**, particularly in those of **childbearing age** or with **multiple pregnancies**, due to increased calcium and vitamin D demands.
- **Postmenopausal women** are also at higher risk, often linked to reduced sun exposure, dietary deficiencies, or medication use.
Surgical Considerations in Metabolic Bone Diseases Indian Medical PG Question 3: True about osteoporosis
- A. Normal serum phosphate levels
- B. Normal serum alkaline phosphatase level
- C. Normal serum calcium levels
- D. All of the options (Correct Answer)
Surgical Considerations in Metabolic Bone Diseases Explanation: ***All of the options***
- In **primary osteoporosis**, serum levels of calcium, phosphate, and alkaline phosphatase are typically **normal**, distinguishing it from other metabolic bone diseases [1].
- The diagnosis of osteoporosis is based on **bone mineral density (BMD)** measurements, not on abnormalities in these serum markers [3].
*Normal serum phosphate levels*
- While correct that serum phosphate is usually normal in osteoporosis, this option alone does not encompass the full biochemical picture [1].
- Osteoporosis is primarily a disorder of **bone quantity**, not systemic mineral metabolism, so levels of **calcium and phosphate remain homeostatically regulated** [1].
*Normal serum alkaline phosphatase level*
- Similarly, a normal alkaline phosphatase level reflects the absence of significantly increased **osteoblast activity** or **bone turnover** that would be seen in conditions like osteomalacia or Paget's disease [2].
- This observation is a key biochemical finding, but it is not the only normal lab value.
*Normal serum calcium levels*
- Normal serum calcium is characteristic of osteoporosis, as **parathyroid hormone** and **vitamin D** regulation of calcium remains intact [4].
- Hypercalcemia or hypocalcemia would suggest alternative diagnoses or complications, such as **primary hyperparathyroidism** or **vitamin D deficiency** [4].
Surgical Considerations in Metabolic Bone Diseases Indian Medical PG Question 4: Which is the drug of choice in Paget's disease?
- A. Allopurinol
- B. Calcitonin
- C. Alendronate (Correct Answer)
- D. Steroids
Surgical Considerations in Metabolic Bone Diseases Explanation: ***Alendronate***
- **Bisphosphonates** like alendronate are the **first-line treatment** for Paget's disease due to their potent antiresorptive inhibitory effect on **osteoclasts**.
- They reduce bone turnover, bone pain, and the risk of complications such as **fractures** and **bone deformities**.
*Allopurinol*
- This drug is used to treat **gout** by inhibiting **xanthine oxidase** and reducing uric acid production.
- It has no role in the management of Paget's disease, which is a disorder of abnormal bone remodeling.
*Calcitonin*
- Historically, calcitonin was used for Paget's disease, but its effectiveness is **less than bisphosphonates** and it is associated with more side effects.
- It is now generally reserved for patients who **cannot tolerate bisphosphonates** or have severe renal impairment.
*Steroids*
- **Corticosteroids** are potent anti-inflammatory and immunosuppressive agents.
- They are primarily used in conditions like **autoimmune disorders** or severe inflammatory diseases, and are **not indicated** for the treatment of Paget's disease.
Surgical Considerations in Metabolic Bone Diseases Indian Medical PG Question 5: A 70 year old male, known case of chronic renal failure suffers from a pathological fracture of Rt femur, the diagnosis is -
- A. Scurvy
- B. Secondary Hyperparathyroidism (Correct Answer)
- C. Vitamin D Resistant rickets
- D. Primary Hyperparathyroidism
Surgical Considerations in Metabolic Bone Diseases Explanation: ***Secondary Hyperparathyroidism***
- **Chronic renal failure** causes **hyperphosphatemia** and **decreased production of calcitriol (active vitamin D)**.
- This leads to hypocalcemia, which stimulates the parathyroid glands to produce excessive **parathyroid hormone (PTH)**, resulting in bone demineralization and **pathological fractures** [2].
*Scurvy*
- Caused by **vitamin C deficiency**, leading to impaired collagen synthesis and fragility of blood vessels.
- While it can cause bone pain and potential for fractures in severe cases, it is not directly associated with **chronic renal failure** as a primary cause of pathological fracture.
*Vitamin D Resistant rickets*
- This is a genetic disorder (e.g., X-linked hypophosphatemia) characterized by impaired renal phosphate reabsorption and normal or elevated PTH levels.
- While it causes bone demineralization, it is typically a **childhood-onset condition** [1] and not directly linked to **acquired chronic renal failure** in a 70-year-old male.
*Primary Hyperparathyroidism*
- Characterized by autonomous **overproduction of PTH** due to parathyroid gland adenoma or hyperplasia, leading to **hypercalcemia** and hypophosphatemia.
- Unlike secondary hyperparathyroidism, which is a compensatory response to hypocalcemia in the context of renal failure, primary hyperparathyroidism is a direct parathyroid gland pathology.
Surgical Considerations in Metabolic Bone Diseases Indian Medical PG Question 6: Select the type of bone disease which is most likely to be associated with genetically determined disorder in the structure or processing of type I collagen (SELECT 1 DISEASE)
- A. Osteogenesis imperfecta (Correct Answer)
- B. Osteopetrosis
- C. Osteomalacia
- D. Osteitis fibrosa cystica
Surgical Considerations in Metabolic Bone Diseases Explanation: ***Osteogenesis imperfecta***
- This condition is primarily caused by **genetic defects** in the production of **type I collagen**, leading to fragile bones.
- Due to these defects, bones are prone to **fractures** with minimal trauma.
*Osteopetrosis*
- Characterized by abnormally **dense bones** due to a defect in **osteoclast function**, not collagen structure [1].
- This leads to bones that are brittle and prone to fracture, but the underlying cause is different from collagen abnormalities [1].
*Osteomalacia*
- This refers to the **softening of bones** due to impaired **mineralization**, most commonly from **vitamin D deficiency** or phosphate imbalance.
- It does not involve a primary defect in the genetic structure or processing of type I collagen.
*Osteitis fibrosa cystica*
- This is a bone lesion caused by **severe hyperparathyroidism**, leading to excessive bone resorption and replacement by fibrous tissue and cysts.
- It is an endocrine disorder affecting **calcium metabolism**, not a primary collagenopathy.
**References:**
[1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, p. 1188.
Surgical Considerations in Metabolic Bone Diseases Indian Medical PG Question 7: Avascular necrosis of bone is LEAST likely to be associated with?
- A. Osgood -Schlatter disease (Correct Answer)
- B. Long-term use of corticosteroids
- C. Sickle-cell disease
- D. Legg-Perthes disease
Surgical Considerations in Metabolic Bone Diseases Explanation: ***Osgood-Schlatter disease***
- This condition is characterized by **inflammation of the patellar ligament** at its insertion into the tibial tuberosity, primarily due to repetitive stress in adolescents.
- While it involves pain and swelling around the knee, it is a **traction apophysitis** and not a form of avascular necrosis.
*Long-term use of corticosteroids*
- **Corticosteroids** are a well-established risk factor for avascular necrosis, particularly in the femoral head, by affecting lipid metabolism and blood flow.
- They can lead to **fat embolism** and increased intraosseous pressure, compromising blood supply to the bone.
*Sickle-cell disease*
- **Sickle cell disease** significantly increases the risk of avascular necrosis due to **vaso-occlusive crises**, where sickled red blood cells block small blood vessels.
- This leads to **ischemia and infarction** in bone marrow, commonly affecting the femoral and humeral heads.
*Legg-Perthes disease*
- This is a specific type of **avascular necrosis of the femoral head** in children, causing a temporary interruption of blood supply to the epiphysis.
- It results in the collapse of the femoral head and subsequent repair processes, consistent with the pathology of avascular necrosis.
Surgical Considerations in Metabolic Bone Diseases Indian Medical PG Question 8: Osteonecrosis is seen in all except
- A. Fracture neck femur
- B. Paget's disease (Correct Answer)
- C. Perthe's disease
- D. Sickle cell anemia
Surgical Considerations in Metabolic Bone Diseases Explanation: ***Paget's disease***
- **Paget's disease of bone (osteitis deformans)** is a localized disorder of bone remodeling, characterized by excessive and disorganized bone formation, leading to enlarged, softened, and misshapen bones, but not directly causing osteonecrosis.
- While complications like **pathological fractures** and **osteosarcoma** can occur, primary osteonecrosis is not a typical feature of Paget's disease itself.
*Fracture neck femur*
- **Fractures of the femoral neck** can disrupt the blood supply to the femoral head, particularly the medial circumflex femoral artery, leading to **avascular necrosis** (osteonecrosis) of the femoral head.
- This is a well-known and common complication, especially in displaced fractures.
*Sickle cell anemia*
- **Sickle cell anemia** causes sickling of red blood cells, leading to **vaso-occlusion** and impaired blood flow to bones, resulting in **bone infarcts** (osteonecrosis).
- This can affect various bones, including the femoral head, humeral head, and vertebrae.
*Perthe's disease*
- **Perthe's disease** (Legg-Calvé-Perthes disease) is a childhood condition characterized by **idiopathic osteonecrosis** of the femoral head.
- It involves the collapse and subsequent re-ossification of the femoral epiphysis due to an interruption of its blood supply.
Surgical Considerations in Metabolic Bone Diseases Indian Medical PG Question 9: A 70-year-old female has been on alendronate for 7 years for osteoporosis and now complains of pain in her right thigh. What is the next investigation to be performed?
- A. DEXA scan
- B. Serum vitamin D levels
- C. Serum alkaline phosphate levels
- D. X-ray (Correct Answer)
Surgical Considerations in Metabolic Bone Diseases Explanation: **X-ray**
- Alendronate, a **bisphosphonate**, is associated with **atypical femoral fractures** after prolonged use, and an X-ray is the most appropriate initial investigation to visualize such a fracture.
- Complaints of thigh pain in a patient on long-term bisphosphonate therapy should prompt imaging to rule out this serious complication.
*DEXA scan*
- A DEXA scan assesses **bone mineral density** but does not provide information about acute fractures or structural integrity in response to specific pain.
- While it's used for osteoporosis diagnosis and monitoring, it won't directly identify an atypical femoral fracture.
*Serum vitamin D levels*
- Maintaining adequate **vitamin D levels** is important for bone health, but its measurement won't explain acute thigh pain or identify a fracture.
- Low vitamin D levels can contribute to osteoporosis but are not the primary cause of pain suggestive of an atypical femoral fracture.
*Serum alkaline phosphate levels*
- **Alkaline phosphatase** levels can be elevated in conditions involving increased bone turnover, such as healing fractures or certain bone diseases.
- However, it is not a direct diagnostic tool for identifying atypical femoral fractures and would not be the first line investigation.
Surgical Considerations in Metabolic Bone Diseases Indian Medical PG Question 10: Brittle bone disease is -
- A. Osteoporosis
- B. Pagets disease
- C. Osteopetrosis
- D. Osteogenesis imperfecta (Correct Answer)
Surgical Considerations in Metabolic Bone Diseases Explanation: ***Osteogenesis imperfecta***
- **Osteogenesis imperfecta** is an inherited disorder characterized by **brittle bones** that fracture easily, due to a defect in **collagen type I** synthesis.
- Patients often present with **blue sclera**, **dentinogenesis imperfecta**, and **hearing loss**, in addition to frequent fractures.
*Osteoporosis*
- **Osteoporosis** is a condition of **decreased bone density**, making bones fragile and prone to fracture, but it is not typically referred to as "brittle bone disease" in the same congenital sense.
- It is more common in older adults and is often related to **hormonal changes** (e.g., post-menopause) or lifestyle factors.
*Paget's disease*
- **Paget's disease of bone** involves abnormal bone remodeling with excessive bone resorption followed by disorganized and expanded bone formation, leading to **enlarged, weakened bones**.
- It typically affects older individuals and can lead to bone pain, deformities, and fractures, but it's not the primary condition associated with "brittle bone disease."
*Osteopetrosis*
- **Osteopetrosis** is characterized by **abnormally dense bones** due to impaired osteoclast function, leading to a buildup of bone.
- While bones are dense, they are also **brittle** and prone to fracture, and the condition is also known as "marble bone disease" rather than "brittle bone disease."
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