Tuberculosis of Bones and Joints Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Tuberculosis of Bones and Joints. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Tuberculosis of Bones and Joints Indian Medical PG Question 1: A healthcare worker develops fever, night sweats, and cough. Sputum shows acid-fast bacilli. What is the next diagnostic test?
- A. Gram stain
- B. Serology for TB
- C. NAAT for TB (Correct Answer)
- D. Sputum culture
Tuberculosis of Bones and Joints Explanation: ***NAAT for TB***
- Nucleic Acid Amplification Tests (**NAAT**) rapidly confirm the presence of **Mycobacterium tuberculosis** DNA or RNA, crucial after an **acid-fast bacilli (AFB) smear** is positive [1].
- This test offers high sensitivity and specificity and can also detect **drug resistance**, guiding immediate treatment decisions [1].
*Gram stain*
- A **Gram stain** is not appropriate for **Mycobacterium tuberculosis** because these bacteria have a unique cell wall that makes them **acid-fast**, not readily stained by the Gram method.
- The initial finding of **acid-fast bacilli** already indicates a general type of organism, making a Gram stain redundant and uninformative for TB.
*Serology for TB*
- **Serological tests for TB** (detecting antibodies to M. tuberculosis) are generally **not recommended** for the diagnosis of active pulmonary TB due to their **poor sensitivity and specificity**.
- They have limited utility in diagnosing active disease and are not endorsed by major health organizations for this purpose.
*Sputum culture*
- **Sputum culture** is the **gold standard** for confirming TB diagnosis and for **drug susceptibility testing**, but it is a **slow process** (taking several weeks) [2].
- While essential for definitive diagnosis and resistance profiling, it is not the **"next" rapid diagnostic test** required given the positive AFB smear.
Tuberculosis of Bones and Joints Indian Medical PG Question 2: According to DOTS-PLUS guidelines 2013, which of the following statements about the treatment of multidrug-resistant TB is incorrect?
- A. Total duration 24-27 months
- B. Intensive phase 6-9 months
- C. Continuation phase - 2 drugs (Correct Answer)
- D. Intensive phase - 6 drugs
Tuberculosis of Bones and Joints Explanation: ***Continuation phase - 2 drugs***
- According to DOTS-PLUS guidelines (2013), the continuation phase for multidrug-resistant TB (MDR-TB) should include at least **three to four effective drugs**, not two.
- Using only two drugs in the continuation phase would be grossly inadequate and would likely lead to treatment failure and the development of extensively drug-resistant TB (XDR-TB).
- This statement is **clearly incorrect** and represents a major deviation from standard treatment protocols.
*Total duration 24-27 months*
- According to DOTS-PLUS 2013 guidelines, the total treatment duration for MDR-TB is typically **18-24 months** (at least 18 months after culture conversion).
- In complex cases, treatment may be extended beyond 24 months, though 24-27 months falls within acceptable parameters for difficult cases.
- This statement is essentially correct for the upper range of treatment duration.
*Intensive phase 6-9 months*
- The intensive phase for MDR-TB treatment is indeed typically **6-9 months** or until culture conversion is documented.
- This phase includes daily injectable agents and multiple oral drugs to rapidly reduce bacterial load.
- This statement is **correct**.
*Intensive phase - 6 drugs*
- The 2013 DOTS-PLUS guidelines recommend an intensive phase regimen comprising **at least 4 effective drugs including an injectable agent**.
- A 5-6 drug regimen may be used in complex cases or when drug susceptibility is uncertain.
- While not the minimum standard, using 6 drugs is within acceptable practice, making this statement **generally correct**.
Tuberculosis of Bones and Joints Indian Medical PG Question 3: A patient with pulmonary tuberculosis, who is receiving anti-tuberculosis therapy consisting of rifampicin, isoniazid, ethambutol, and pyrazinamide, should be advised to take which of the following supplements?
- A. Niacin
- B. Riboflavin
- C. Pyridoxine (Correct Answer)
- D. Thiamine
Tuberculosis of Bones and Joints Explanation: ***Pyridoxine***
- **Isoniazid** in the anti-tuberculosis regimen can cause **peripheral neuropathy** by interfering with **pyridoxine (vitamin B6)** metabolism.
- Supplementation with **pyridoxine** is advised to prevent this neurotoxic side effect, especially in patients at higher risk such as those with diabetes, malnutrition, or alcoholism.
*Niacin*
- **Niacin (vitamin B3)** deficiency can lead to **pellagra**, characterized by dermatitis, diarrhea, and dementia.
- While important for general health, niacin supplementation is not specifically required to counteract side effects of standard anti-tuberculosis drugs.
*Riboflavin*
- **Riboflavin (vitamin B2)** is essential for various metabolic processes and cellular energy production.
- There is no direct significant depletion or interference with riboflavin metabolism caused by the common anti-tuberculosis drugs.
*Thiamine*
- **Thiamine (vitamin B1)** deficiency can lead to **beriberi** and neurological symptoms, particularly in those with chronic alcoholism.
- While thiamine is crucial for neurological function, antitubercular drugs do not specifically deplete or interfere with its metabolism to the extent of requiring routine supplementation.
Tuberculosis of Bones and Joints Indian Medical PG Question 4: Identify the condition shown in the image:
- A. Renal osteodystrophy
- B. Spondylolisthesis
- C. Tuberculosis (TB)
- D. Spondylolysis (Correct Answer)
Tuberculosis of Bones and Joints Explanation: ***Spondylolysis***
* The image shows a **break in the pars interarticularis** of a vertebra, indicated by the arrow, which is characteristic of spondylolysis.
* This condition is a **stress fracture** or defect in the pars interarticularis, a bony segment connecting the superior and inferior articular facets.
*Renal osteodystrophy*
* Renal osteodystrophy refers to a spectrum of **bone abnormalities** that occur in chronic kidney disease, not a specific vertebral fracture pattern.
* It typically involves features such as **osteomalacia**, **osteitis fibrosa cystica**, or **osteoporosis**, which are not directly depicted as a fracture in this image.
*Spondylolisthesis*
* Spondylolisthesis is the **anterior slippage** of one vertebral body over another, which can be caused by bilateral spondylolysis but is not directly shown as a slip in this specific image.
* The image distinctly highlights the **fracture line** itself, rather than the displacement of the vertebral body.
*Tuberculosis (TB)*
* Spinal tuberculosis (Pott's disease) typically presents with **destruction of vertebral bodies**, disc space narrowing, and often a **paravertebral abscess**.
* The image does not show these features; instead, it demonstrates a clear **bony defect** in the pars interarticularis.
Tuberculosis of Bones and Joints Indian Medical PG Question 5: In tuberculosis, a 'case' is
- A. Cough
- B. X-ray positive
- C. Sputum positive (Correct Answer)
- D. Mantoux positive
Tuberculosis of Bones and Joints Explanation: ***Sputum positive***
- In the context of **tuberculosis (TB)**, a 'case' is defined by **bacteriological confirmation**, most commonly through **sputum smear positivity** for acid-fast bacilli (AFB).
- According to **RNTCP (Revised National Tuberculosis Control Programme)** guidelines, a sputum smear-positive case is one with at least **two sputum specimens positive for AFB**, or one sputum specimen positive for AFB plus radiographic abnormalities consistent with active pulmonary TB.
- A positive sputum smear confirms the presence of **Mycobacterium tuberculosis** in the respiratory tract, indicating active, transmissible infection requiring immediate treatment.
*Cough*
- **Cough** is a common symptom of tuberculosis but is not sufficient on its own to define a 'case'.
- Many respiratory conditions can cause a cough, and it does not confirm the presence of **Mycobacterium tuberculosis** or infectiousness.
- Cough lasting more than 2-3 weeks is a screening criterion for TB suspects, not a case definition.
*X-ray positive*
- A **positive chest X-ray** can show abnormalities consistent with tuberculosis, such as infiltrates, cavities, or hilar lymphadenopathy.
- However, radiological findings alone do not definitively confirm a TB diagnosis, as many other conditions can mimic TB on chest X-ray.
- Chest X-ray is used for **clinically diagnosed TB cases** when bacteriological confirmation is not possible, but it does not establish active infectivity without microbiological confirmation.
*Mantoux positive*
- A **positive Mantoux test** (tuberculin skin test) indicates exposure to Mycobacterium tuberculosis and the presence of a cell-mediated immune response.
- It signifies **latent TB infection (LTBI)** but does not indicate active, infectious disease.
- Many people with positive Mantoux tests never develop active TB and are not considered 'cases'.
Tuberculosis of Bones and Joints Indian Medical PG Question 6: A 60-year-old male presents with chronic arthritis. Which of the following is the most likely cause?
- A. OA (Correct Answer)
- B. TB
- C. RA
- D. Pyogenic infection in infancy
Tuberculosis of Bones and Joints Explanation: Crystal-induced arthritis, such as gout or calcium pyrophosphate deposition disease (CPPD), can lead to chronic arthritis associated with progressive joint damage and functional limitations [1]. While acute presentations are common, such as 'pseudogout' involving the knee, the underlying pathophysiology involves the balance of crystal formation and tissue concentration within the joint [1]. Specific causes like metabolic diseases or previous trauma may also predispose individuals to early-onset osteoarthritis [2].
Tuberculosis of Bones and Joints Indian Medical PG Question 7: A 75-year-old female has chronic backache. X-ray of the spine is shown. What is the most likely diagnosis?
- A. Osteoporosis (Correct Answer)
- B. Spondylodiscitis
- C. Pott's spine
- D. Spondylolisthesis
Tuberculosis of Bones and Joints Explanation: ***Osteoporosis***
- The X-ray shows diffuse **osteopenia** (reduced bone density) and **vertebral compression fractures**, particularly visible in the lateral view, which are characteristic findings in elderly patients with osteoporosis and chronic backache.
- The vertebral bodies appear **demineralized** and some exhibit a loss of height, suggesting collapse due to weakened bone structure.
*Spondylodiscitis*
- This condition involves **inflammation of the vertebral body and adjacent intervertebral disc**, typically showing **erosions** of the vertebral endplates and **narrowing of the disc space** on X-ray, which are not clearly evident here as the primary issue.
- While it can cause back pain, the dominant finding on this X-ray is widespread bone density loss and fractures, rather than localized infection-related changes.
*Pott's spine*
- Pott's spine (**tuberculous spondylitis**) is a form of osteomyelitis that causes **destruction of vertebral bodies** and adjacent discs, often leading to a **gibbus deformity** (sharp posterior angulation of the spine).
- The X-ray does not show extensive vertebral destruction, paraspinal abscess formation, or typical kyphotic deformity associated with Pott's spine.
*Spondylolisthesis*
- Spondylolisthesis is characterized by the **forward slippage of one vertebral body over another**, often due to a defect in the pars interarticularis.
- While there may be some degenerative changes, there is no clear evidence of significant anterior translation of a vertebral body on the lateral X-ray that would indicate spondylolisthesis.
Tuberculosis of Bones and Joints Indian Medical PG Question 8: What is considered a poor prognostic indicator in Pott's paraplegia?
- A. Healed disease
- B. Chronic disease
- C. Rapid progression of neurological deficits (Correct Answer)
- D. Active disease
Tuberculosis of Bones and Joints Explanation: ***Rapid progression of neurological deficits***
- **Rapid progression** implies severe spinal cord damage occurring quickly, which is less likely to fully recover even with treatment.
- This indicates a more aggressive disease process or significant compression that can lead to irreversible neurological impairment.
*Healed disease*
- **Healed disease** (even if paraplegia existed previously) indicates that the infection is resolved and the destructive process has stopped, allowing for potential neurological recovery or stability.
- While residual neurological deficits might remain, the absence of active inflammation improves the long-term prognosis compared to ongoing damage.
*Chronic disease*
- **Chronic disease** in the context of Pott's paraplegia often refers to established deficits after a prolonged course, but it doesn't necessarily imply ongoing active deterioration.
- The chronicity itself, without rapid progression, suggests a more stable state where the damage has already occurred, and further deterioration might be slow or absent.
*Active disease*
- **Active disease** means the infection is still present and causing bone destruction, which is a concern.
- However, if the neurological deficits are not rapidly progressing, there is still a window for treatment to stop the disease and potentially allow for some recovery, distinguishing it from an acute, rapidly deteriorating situation.
Tuberculosis of Bones and Joints Indian Medical PG Question 9: Tuberculosis of the spine; what is the most common site affected?
- A. Sacral
- B. Dorsolumbar (Correct Answer)
- C. Lumbosacral
- D. Cervical
Tuberculosis of Bones and Joints Explanation: ***94ed055d-c7da-4d18-a2fd-52720dfe8b6e***
- The **dorsolumbar (thoracolumbar)** region is the most common site of **spinal tuberculosis (Pott's disease)** [1] due to its high vascularity, facilitating hematogenous spread.
- **Spinal tuberculosis** typically affects the vertebral bodies, leading to their destruction, kyphosis (angular deformity), and potentially neurological deficits [1].
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- The **sacral** region can be affected by **tuberculosis**, but it is considerably less common than the thoracolumbar region.
- Involvement of the sacrum is often associated with **direct extension** from adjacent structures, such as the sacroiliac joint, rather than primary vertebral involvement.
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- **Cervical spine tuberculosis** is relatively rare, accounting for a small percentage of all spinal tuberculosis cases.
- While possible, it presents with specific challenges due to the proximity of vital neurological and vascular structures.
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- The **lumbosacral region** (L5-S1) can be involved in **tuberculosis**, but it is less frequently affected than the thoracolumbar region.
- While the lumbar spine is a common site, the entire lumbosacral region as a single entity is not the most common spot for spinal TB.
Tuberculosis of Bones and Joints Indian Medical PG Question 10: What is the earliest X-ray sign observed in spinal tuberculosis?
- A. Gibbus
- B. Narrowing of disc space (Correct Answer)
- C. Paravertebral shadow
- D. Endplate erosion
Tuberculosis of Bones and Joints Explanation: ***Narrowing of disc space***
- This is the **earliest radiographic finding** in spinal tuberculosis on plain X-ray, typically appearing within the first few weeks to months of infection.
- Tuberculous spondylitis begins in the **anterior subchondral region** near the vertebral endplates, leading to early involvement of the intervertebral disc.
- The infection spreads from the vertebral body to the adjacent disc, causing **disc space narrowing** along with endplate irregularities as initial manifestations.
- Unlike pyogenic spondylitis, TB shows **relatively preserved** disc space initially, but narrowing is still the earliest visible change.
*Endplate erosion*
- **Endplate erosion** occurs concurrently with or shortly after disc space narrowing as the tuberculous infection destroys the subchondral bone.
- Both findings appear early in the disease course and are often seen together on X-ray.
- This represents active bone destruction at the vertebral margins.
*Paravertebral shadow*
- The **paravertebral abscess** is a characteristic and important finding in spinal tuberculosis, but it develops **later** in the disease course.
- It forms as a secondary phenomenon when the infection spreads beyond the vertebral body, with caseous material and pus collecting along the paravertebral ligaments.
- While highly suggestive of TB when present, it is not the earliest radiographic sign.
*Gibbus*
- A **gibbus deformity** is a **late complication** resulting from vertebral body collapse and subsequent angular kyphosis.
- It indicates extensive vertebral destruction and significant structural compromise.
- This is a clinical and radiographic sign of advanced disease, not an early finding.
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