Metabolic Bone Diseases Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Metabolic Bone Diseases. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Metabolic Bone Diseases Indian Medical PG Question 1: Bones, stones, abdominal groans, and psychiatric overtones are features of?
- A. Hypothyroidism
- B. Hyperparathyroidism (Correct Answer)
- C. Hypoparathyroidism
- D. Hyperthyroidism
Metabolic Bone Diseases Explanation: ***Hyperparathyroidism***
- This mnemonic ("**bones, stones, abdominal groans, and psychiatric overtones**") perfectly describes the classic manifestations of **hypercalcemia** due to hyperparathyroidism [1].
- **Bones** refers to bone pain from increased osteoclastic activity [1], **stones** to kidney stones [1], **abdominal groans** to GI symptoms like constipation or pancreatitis [1], and **psychiatric overtones** to neuropsychiatric symptoms like depression or confusion.
*Hyperthyroidism*
- Characterized by symptoms of an **overactive metabolism**, such as weight loss, heat intolerance, tremor, and tachycardia [1].
- It does not typically present with the "bones, stones, and groans" triad associated with calcium imbalances.
*Hypothyroidism*
- Involves symptoms of an **underactive metabolism**, including weight gain, cold intolerance, fatigue, and bradycardia.
- While it can cause some psychiatric symptoms (e.g., depression), it does not involve issues like kidney stones or significant bone problems from hypercalcemia.
*Hypoparathyroidism*
- Leads to **hypocalcemia**, presenting with symptoms like **tetany**, muscle cramps, paresthesias, and seizures.
- This is the opposite of hyperparathyroidism and would not cause the symptoms listed in the mnemonic.
Metabolic Bone Diseases Indian Medical PG Question 2: Hypocalcemia with hypophosphatemia is seen in:
- A. Vitamin D deficiency rickets (Correct Answer)
- B. Rhabdomyolysis
- C. Crush injury
- D. Renal failure
Metabolic Bone Diseases Explanation: ***Vitamin D deficiency rickets***
- **Vitamin D deficiency** impairs intestinal **calcium** and **phosphate** absorption, leading to both hypocalcemia and hypophosphatemia [1], [2].
- The body attempts to compensate by increasing parathyroid hormone (PTH) secretion, but the primary defect in vitamin D leads to low serum levels of both electrolytes [2], [3].
*Rhabdomyolysis*
- **Rhabdomyolysis** primarily causes **hyperkalemia**, **hyperphosphatemia**, and **hypocalcemia** due to the release of intracellular contents from damaged muscle and calcium deposition in injured muscle.
- While it causes hypocalcemia, it typically leads to **hyperphosphatemia**, not hypophosphatemia.
*Crush injury*
- Similar to rhabdomyolysis, **crush injury** involves massive muscle breakdown, leading to the release of intracellular components.
- This typically results in **hyperkalemia**, **hyperphosphatemia**, and **hypocalcemia**, not hypophosphatemia.
*Renal failure*
- **Chronic renal failure** often leads to **hyperphosphatemia** due to impaired phosphate excretion and **hypocalcemia** due to reduced renal activation of vitamin D and impaired phosphate handling [2].
- While hypocalcemia is common, the presence of **hyperphosphatemia** differentiates it from vitamin D deficiency rickets [2], [3].
Metabolic Bone Diseases Indian Medical PG Question 3: Which of the following clinical findings is characteristic of both osteomalacia and rickets?
- A. frontal bossing in the skull
- B. defects in tooth enamel
- C. muscle weakness (Correct Answer)
- D. prominent costochondral junctions
Metabolic Bone Diseases Explanation: ***Muscle weakness***
- **Muscle weakness** is a common symptom in both rickets (in children) and osteomalacia (in adults) due to **impaired mineralization of bone matrix** and compromised muscle function [1].
- This weakness often presents as **difficulty walking**, standing, or performing daily activities.
*Frontal bossing in the skull*
- **Frontal bossing** (prominent forehead) is a specific sign of **rickets** in children, resulting from excessive unmineralized osteoid on the skull [1].
- It is not typically seen in adult **osteomalacia**, as the skull bones are already formed.
*Defects in tooth enamel*
- **Defects in tooth enamel** are primarily associated with a prolonged and severe deficiency of **vitamin D or calcium during tooth development**, which is characteristic of childhood **rickets**.
- While vitamin D and calcium are crucial for overall bone health, enamel defects are less common or severe in adult-onset **osteomalacia**.
*Prominent costochondral junctions*
- **Prominent costochondral junctions** (rachitic rosary) are a classic sign of **rickets** in children, caused by the enlargement of the cartilage at the ends of the ribs due to defective mineralization [1].
- This finding is specific to growing children and is not observed in adults with **osteomalacia**.
Metabolic Bone Diseases Indian Medical PG Question 4: All are true about primary hyperparathyroidism except which of the following?
- A. Nephrolithiasis
- B. Loss of lamina dura
- C. Decreased calcium (Correct Answer)
- D. Increased alkaline phosphatase
Metabolic Bone Diseases Explanation: ***Decreased calcium***
- Primary hyperparathyroidism is characterized by **excessive parathyroid hormone (PTH)** secretion, which leads to **hypercalcemia (increased calcium levels)**, not decreased calcium [1].
- PTH's main actions are to raise serum calcium by increasing **bone resorption**, **renal calcium reabsorption**, and **calcitriol synthesis** [2].
*Nephrolithiasis*
- **Hypercalcemia** from primary hyperparathyroidism leads to increased calcium excretion in the urine, increasing the risk of **calcium oxalate stones** (nephrolithiasis) [3].
*Increased alkaline phosphatase*
- PTH stimulates osteoclastic activity, leading to **increased bone turnover** and release of enzymes like **alkaline phosphatase**, particularly in cases with significant bone involvement.
- Alkaline phosphatase levels may also be elevated due to **osteitis fibrosa cystica**, a severe form of bone disease associated with primary hyperparathyroidism.
*Loss of lamina dura*
- Chronic hyperparathyroidism can cause characteristic changes in bone, including the **resorption of the lamina dura** around the teeth, which is visible on dental radiographs.
- This is a direct consequence of PTH-mediated **osteoclastic activity** in areas of high bone turnover.
Metabolic Bone Diseases Indian Medical PG Question 5: A 55 yr old patient presented to the opd with complaint of pain in back. On examination his limbs seemed to be bent with overlying warm and thick skin. Patient also complain of decreased hearing over a few days. On biochemical analysis his serum ALP was raised. X-ray obtained showed the following features. Most probable diagnosis?
- A. Renal osteodystrophy
- B. Osteoporosis
- C. Pagets disease (Correct Answer)
- D. Osteopetrosis
Metabolic Bone Diseases Explanation: ***Pagets disease***
- The combination of **bent limbs** (skeletal deformities), **warm and thick skin** (increased vascularity and bone remodeling), **decreased hearing** (due to involvement of skull bones), and **raised serum ALP** (reflecting high osteoblastic activity) is highly characteristic of Paget's disease of bone.
- The X-ray image showing **cotton wool appearance** of the skull and thickening of the calvarium strongly supports this diagnosis; these features are a hallmark of advanced Paget's disease.
*Renal osteodystrophy*
- This condition results from **chronic kidney disease** and typically involves abnormal bone turnover, but the specific combination of warm skin, bent limbs and decreased hearing is not typical.
- X-ray findings in renal osteodystrophy often include osteosclerosis (especially "rugger-jersey spine") or osteopenia, not the **cotton wool appearance** seen in the skull here.
*Osteoporosis*
- Characterized by **decreased bone density** and increased fracture risk, often asymptomatic until a fracture occurs.
- While back pain can occur due to vertebral compression fractures, the bone deformities, warm skin, hearing loss, and elevated ALP are **not features of osteoporosis**.
*Osteopetrosis*
- A rare genetic disorder characterized by **increased bone density** due to defective osteoclasts, leading to brittle bones and often hematologic problems.
- While it can manifest as bone pain and hearing loss due to cranial nerve compression, the bones are abnormally dense and sclerotic on X-ray, in contrast to the **mixed lytic and blastic lesions** with cortical thickening seen in Paget's disease.
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