Arthrology and Infections Practice Questions

Q: Osteomyelitis of the jaw can be cured by?

Sequestrectomy with antibiotic treatment. **Explanation:** The management of chronic osteomyelitis, particularly in the jaw (mandible), is centered on the removal of necrotic tissue and the eradication of infection. **Why Option C is Correct:** The hallmark of chronic osteomyelitis is the formation of a **sequestrum**—a piece of dead bone that has become detached from the healthy bone. Because the sequestrum is avascular, systemic antibiotics cannot reach the bacteria residing within it. Therefore, **sequestrectomy** (surgical removal of the dead bone) is mandatory. This must be combined with long-term, culture-sensitive **antibiotic treatment** to eliminate the residual infection in the surrounding vascularized bone and soft tissue. **Analysis of Incorrect Options:** * **A. Resection:** This involves removing a segment of the bone. While used in aggressive cases or malignancies, it is overly radical for standard osteomyelitis and leads to significant functional and aesthetic deformity. * **B. Physiotherapy:** This is a supportive treatment for joint mobility but has no role in treating an active bacterial infection of the bone. * **D. Drainage:** Simple incision and drainage (I&D) are effective for acute abscesses in soft tissue, but they fail to address the underlying necrotic bone (sequestrum) which acts as a persistent nidus for infection. **High-Yield Clinical Pearls for NEET-PG:** * **Involucrum:** The layer of new periosteal bone that forms around the sequestrum. * **Cloaca:** The opening in the involucrum through which pus and debris escape. * **Most Common Organism:** *Staphylococcus aureus* remains the most common cause of osteomyelitis overall. * **Imaging:** MRI is the most sensitive modality for early diagnosis; however, a CT scan is superior for identifying a sequestrum.

Q: Which of the following is NOT a clinical feature of Chronic Osteomyelitis?

Excruciating pain and tenderness. **Explanation:** The hallmark of **Chronic Osteomyelitis** is a low-grade, persistent infection characterized by the presence of necrotic bone (**sequestrum**) and a reactive sheath of new bone (**involucrum**). **Why Option A is the Correct Answer:** Excruciating pain and high-grade tenderness are classic features of **Acute Osteomyelitis**, where there is rapid intramedullary pressure buildup and systemic toxicity. In contrast, Chronic Osteomyelitis is typically **painless** or presents with only a dull ache. If a patient with chronic osteomyelitis suddenly develops excruciating pain, it usually indicates a pathological fracture or an acute flare-up (acute-on-chronic). **Analysis of Incorrect Options:** * **Option B:** Chronic infection leads to persistent inflammation, resulting in **non-healing wounds** and **indurated (thickened/hardened) soft tissue** due to long-standing fibrosis and scarring. * **Option C:** The formation of a thick, irregular involucrum around the infected site gives the bone a thickened, rough, and **"wooden" character** on palpation. * **Option D:** **Draining sinuses** are a pathognomonic feature. These tracts allow the discharge of pus and occasionally small pieces of sequestra from the infected bone to the skin surface. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Bone Biopsy and Culture. * **Radiological Sign:** Sequestrum (dead bone, appears radio-opaque) and Involucrum (new bone, appears radio-lucent/surrounding). * **Brodie’s Abscess:** A form of subacute osteomyelitis characterized by a radiolucent nidus surrounded by sclerosis. * **Complication:** Long-standing discharging sinuses in chronic osteomyelitis can lead to **Marjolin’s Ulcer** (Squamous Cell Carcinoma).

Q: What is the most common type of spinal tuberculosis?

Paradiscal. **Explanation:** Spinal tuberculosis (Pott’s disease) is the most common form of skeletal tuberculosis. The classification of the disease is based on the initial site of vertebral involvement. **1. Why Paradiscal is the Correct Answer:** The **Paradiscal** type is the most common variety (seen in ~95% of cases). The infection typically begins in the subchondral bone of the vertebral body adjacent to the intervertebral disc. Because the arterial supply to the vertebrae (via the segmental arteries) bifurcates to supply the adjacent margins of two vertebrae, the infection easily spreads across the disc space to involve the neighboring vertebra. This leads to the characteristic **narrowing of the disc space** seen on X-ray. **2. Why Other Options are Incorrect:** * **Central:** The infection starts in the center of the vertebral body. It often leads to early collapse and "vertebra plana," but it is less common than the paradiscal type. * **Anterior:** The infection involves the anterior surface of the vertebral body and spreads under the anterior longitudinal ligament. It is common in children but not the overall most frequent type. * **Posterior:** This involves the posterior elements (lamina, spines, pedicles). It is rare and clinically significant because it often leads to early neurological deficits due to spinal cord compression. **Clinical Pearls for NEET-PG:** * **Most common site:** Lower Thoracic and Upper Lumbar spine (T12-L1). * **Earliest X-ray sign:** Rarefaction (osteopenia) of the paradiscal margins and narrowing of the disc space. * **Cold Abscess:** A hallmark of Pott’s disease; it is "cold" because it lacks the typical signs of acute inflammation (heat, redness). * **Deformity:** The destruction of the anterior part of the vertebrae leads to **Kyphosis** (Gibbus deformity).

Q: Which of the following is not a type of chronic osteomyelitis?

None of the above. **Explanation:** Chronic osteomyelitis is a persistent infection of the bone characterized by the presence of necrotic bone (**sequestrum**), new bone formation (**involucrum**), and often, discharging sinuses. It can manifest in several clinical forms depending on the virulence of the organism and the host's immune response. **Why "None of the above" is correct:** All the options listed (A, B, and C) are recognized subtypes of chronic osteomyelitis. Therefore, none of them can be excluded from the category. * **Garre’s Sclerosing Osteomyelitis:** A specific type of chronic non-suppurative osteomyelitis characterized by peripheral reactive bone formation and cortical thickening. It typically affects the mandible or tibia in children and young adults, often triggered by a low-grade irritation or infection. * **Chronic Suppurative Osteomyelitis:** The most common form, usually following inadequately treated acute osteomyelitis. It involves pus formation, sequestrum, and discharging sinuses. * **Condensing Osteitis:** A variant of focal sclerosing osteomyelitis usually seen at the apex of a tooth with a long-standing pulpitis. It represents a localized bony reaction to a low-grade inflammatory stimulus. **High-Yield Clinical Pearls for NEET-PG:** * **Brodie’s Abscess:** A form of subacute or chronic osteomyelitis appearing as a radiolucent lesion surrounded by sclerosis, most commonly in the **metaphysis of the tibia**. * **Pathognomonic Sign:** The presence of a **sequestrum** (dead bone) is the hallmark of chronic osteomyelitis on X-ray. * **Marjolin’s Ulcer:** A rare but serious complication where squamous cell carcinoma develops in the chronic discharging sinus tract of osteomyelitis. * **Gold Standard Investigation:** While X-rays show involucrum and sequestrum, **MRI** is the most sensitive for early detection, and **Bone Biopsy/Culture** is the gold standard for definitive diagnosis.

Q: Progressive stiffening of a joint is seen in which of the following conditions?

Pericarditis of the shoulder. **Explanation:** The hallmark of **Periarthritis of the shoulder** (also known as Adhesive Capsulitis or Frozen Shoulder) is the **progressive, painful stiffening** of the glenohumeral joint. This condition involves chronic inflammation, fibrosis, and thickening of the joint capsule, leading to a gradual loss of both active and passive range of motion (especially external rotation and abduction). It typically progresses through three stages: Freezing (painful), Frozen (stiffening), and Thawing (recovery). **Analysis of Options:** * **Osteochondritis (B):** This refers to joint inflammation involving the bone and cartilage (e.g., Osteochondritis Dissecans). While it causes pain and mechanical symptoms like locking or clicking, it does not typically present with the global, progressive stiffening seen in periarthritis. * **Gout (C):** Gout is a metabolic arthropathy characterized by **acute, episodic attacks** of severe pain, redness, and swelling. Between attacks, the joint usually returns to normal; chronic stiffness only occurs in advanced, untreated tophaceous gout. * **Ankylosis (D):** Ankylosis refers to the **end-stage** of joint destruction where the joint is already fused (either fibrous or bony). It represents a state of permanent immobility rather than a "progressive stiffening" process. **NEET-PG High-Yield Pearls:** * **Adhesive Capsulitis** is most commonly associated with **Diabetes Mellitus** (most common), thyroid disorders, and post-thoracic surgery. * The first movement to be lost and the last to be recovered is **External Rotation**. * **X-ray findings** in Periarthritis are typically **normal**, which helps differentiate it from osteoarthritis or tuberculosis of the shoulder. * Management usually involves NSAIDs, physical therapy, and intra-articular steroid injections.

Q: What is the characteristic position of the leg in the synovitis stage of tubercular arthritis?

Flexion, abduction, external rotation. In Tuberculosis of the hip, the deformity progresses through three distinct clinical stages based on the pathological changes in the joint. **1. Why Option C is Correct:** In the **Stage of Synovitis** (Stage I), there is an accumulation of inflammatory exudate (joint effusion) within the joint capsule. To accommodate this increased fluid and minimize intra-articular pressure, the patient instinctively holds the hip in the position of **maximum joint capacity**. This position is **Flexion, Abduction, and External Rotation**. Clinically, this results in "apparent lengthening" of the limb because the pelvis tilts downwards on the affected side to bring the abducted leg parallel to the other. **2. Why the other options are incorrect:** * **Option A (Flexion, Adduction, Internal Rotation):** This is the characteristic deformity of the **Stage of Arthritis (Stage II)**. As the disease progresses, the articular cartilage is destroyed, and the protective spasm of the stronger adductor and flexor muscles leads to this position, resulting in "apparent shortening." * **Option B & D:** These combinations do not correspond to the physiological state of the hip joint during the progression of TB. Extension is rarely seen in inflammatory hip conditions as it increases intra-articular pressure. **NEET-PG High-Yield Pearls:** * **Stage I (Synovitis):** Flexion, Abduction, External Rotation (**FABER**). *Apparent lengthening.* * **Stage II (Arthritis):** Flexion, Adduction, Internal Rotation (**FADIR**). *Apparent shortening.* * **Stage III (Erosion/Destruction):** Further FADIR with **True Shortening** due to "wandering acetabulum" or pathological dislocation. * **Earliest sign of Hip TB:** Limitation of **internal rotation and extension**. * **Phemister’s Triad (Radiology):** Juxta-articular osteopenia, peripheral osseous erosions, and gradual joint space narrowing.

Q: Caries sicca is seen in which anatomical location?

Shoulder. **Explanation:** **Caries sicca** is a specific clinical presentation of **Tuberculosis (TB) of the shoulder joint**. The term "sicca" means dry; it refers to the dry form of the disease characterized by significant wasting of the deltoid muscle and destruction of the humeral head without the formation of a "cold abscess" or sinus tract. * **Why Shoulder is Correct:** In the shoulder, TB often follows an indolent course where bone destruction occurs via granulation tissue, but the typical caseous pus (cold abscess) is absent. This leads to a stiff, "dry" joint with severe muscle atrophy, making the shoulder the classic site for this condition. * **Why other options are incorrect:** * **Hip and Knee:** TB in these weight-bearing joints usually presents as the "moist" or "exudative" form, characterized by significant joint effusion, synovial thickening, and frequent cold abscess formation. * **Metatarsal:** TB of the short tubular bones (metatarsals/metacarpals) is known as **Spina Ventosa**, characterized by expansile bone destruction and a "wind-filled" appearance on X-ray. **High-Yield Clinical Pearls for NEET-PG:** * **Triad of TB Shoulder:** Pain, stiffness (frozen shoulder-like), and marked deltoid wasting. * **Radiological sign:** Look for **Phemister’s triad** (juxta-articular osteopenia, peripheral erosions, and gradual joint space narrowing). * **Spina Ventosa:** Most common in children; involves phalanges and metatarsals. * **Pott’s Paraplegia:** The most common complication of spinal TB (the most common site of skeletal TB overall).

Q: A bodybuilder taking steroids and creatinine presented with hip pain and inability to squat. MRI shows disruption of the femoral articular surface and a crescent sign is seen on radiograph. What is the diagnosis?

Avascular necrosis. ### **Explanation** **Correct Option: A. Avascular Necrosis (AVN)** The clinical presentation and imaging findings are classic for **Avascular Necrosis of the femoral head**. * **Risk Factors:** The patient is a bodybuilder using **steroids**, which is a leading non-traumatic cause of AVN due to fat emboli and increased intraosseous pressure. * **Radiological Signs:** The **"Crescent Sign"** is a pathognomonic radiographic finding representing a subchondral fracture (Ficat Stage III). MRI is the gold standard for early diagnosis, showing disruption of the articular surface and marrow edema. * **Clinical Features:** Hip pain and restricted terminal movements (like squatting or sitting cross-legged) are typical early signs. **Why other options are incorrect:** * **B. Osteochondroma:** This is a benign bone tumor (exostosis) usually occurring at the metaphysis of long bones. It does not cause subchondral collapse or a crescent sign. * **C. Tuberculous arthritis:** While common in India, it typically presents with constitutional symptoms (fever, weight loss), "Phemister triad" (juxta-articular osteopenia, peripheral erosions, joint space narrowing), and cold abscesses, rather than a crescent sign. * **D. Fracture neck of femur:** While it can *lead* to AVN, an acute fracture would present with a history of trauma, sudden onset of total inability to bear weight, and a shortened, externally rotated limb. ### **NEET-PG High-Yield Pearls** * **Gold Standard Investigation:** MRI (shows "Double Line Sign" on T2 images). * **Earliest Sign on X-ray:** Increased density (sclerosis) of the femoral head. * **Ficat-Arlet Classification:** Used for staging AVN (Stage I: Normal X-ray, abnormal MRI; Stage II: Sclerosis/Cysts; Stage III: Crescent sign/Flattening; Stage IV: Secondary Osteoarthritis). * **Most common site:** Head of the femur (due to retrograde blood supply via the medial circumflex femoral artery).

Q: What is reactive tuberculous arthritis known as?

Poncet's disease. **Explanation:** **Poncet’s disease** is a rare aseptic **reactive arthritis** observed in patients with active tuberculosis (usually extrapulmonary). Unlike tuberculous arthritis, where the bacilli are present within the joint, Poncet’s disease is an immune-mediated hypersensitivity reaction to the *Mycobacterium tuberculosis* antigen. It typically presents as a symmetrical polyarthritis involving large joints (like the knees and ankles) and resolves completely without residual joint damage once anti-tubercular treatment (ATT) is initiated. **Analysis of Incorrect Options:** * **A. Spina Ventosa:** This refers to tuberculous dactylitis, which involves the short tubular bones of the hands and feet (metacarpals, metatarsals, and phalanges). It is characterized by subperiosteal bone formation and expansion of the bone marrow cavity, giving it a "wind-filled" appearance on X-ray. * **B. Pott’s Disease:** This is the most common form of skeletal tuberculosis, specifically referring to **tuberculous spondylitis** (infection of the spine). It typically involves the lower thoracic and upper lumbar vertebrae and can lead to kyphotic deformity (gibbus) and neurological deficits. **High-Yield Clinical Pearls for NEET-PG:** * **Poncet’s vs. TB Arthritis:** In Poncet’s, the synovial fluid is **sterile** (no AFB on smear or culture), whereas TB arthritis is a direct monoarticular infection with positive cultures. * **Most common site of Skeletal TB:** Spine (Pott's disease), followed by the Hip and Knee. * **Cold Abscess:** A hallmark of TB, it is a collection of pus without the classic signs of inflammation (heat, redness). * **Triad of Pott’s Paraplegia:** Spasticity, sensory loss, and bladder/bowel involvement.

Question 1

Osteomyelitis of the jaw can be cured by?

Accepted Answer

Sequestrectomy with antibiotic treatment

Answer

Resection

Answer

Physiotherapy

Answer

Drainage

Question 2

Which of the following is NOT a clinical feature of Chronic Osteomyelitis?

Accepted Answer

Excruciating pain and tenderness

Answer

Non-healing bony and overlying soft tissue wounds with indurated soft tissue

Answer

Wooden character of bone

Answer

Draining sinuses

Question 3

What is the most common type of spinal tuberculosis?

Accepted Answer

Paradiscal

Answer

Answer

Posterior

Answer

Central

Question 4

Which of the following is not a type of chronic osteomyelitis?

Accepted Answer

None of the above

Answer

Garre's osteomyelitis

Answer

Chronic suppurative osteomyelitis

Answer

Condensing osteitis

Question 5

Progressive stiffening of a joint is seen in which of the following conditions?

Accepted Answer

Pericarditis of the shoulder

Answer

Osteochondritis

Answer

Gout

Answer

Ankylosis

Question 6

All dead or devitalized bone must be identified by the preoperative injection of a vital stain that stains all living tissue green, leaving dead material unstained. Which of the following conditions is characterized by dead bone material?

Accepted Answer

Chronic osteomyelitis with sequestrum

Answer

Acute osteomyelitis with sequestrum

Answer

Subacute haematogenous osteomyelitis with sequestrum

Answer

Chronic osteomyelitis with cavity

Question 7

What is the characteristic position of the leg in the synovitis stage of tubercular arthritis?

Accepted Answer

Flexion, abduction, external rotation

Answer

Flexion, adduction, internal rotation

Answer

Flexion, abduction, internal rotation

Answer

Extension, abduction, internal rotation

Question 8

Caries sicca is seen in which anatomical location?

Accepted Answer

Shoulder

Answer

Hip

Answer

Knee

Answer

Metatarsal

Question 9

A bodybuilder taking steroids and creatinine presented with hip pain and inability to squat. MRI shows disruption of the femoral articular surface and a crescent sign is seen on radiograph. What is the diagnosis?

Accepted Answer

Avascular necrosis

Answer

Osteochondroma

Answer

Tuberculous arthritis of the hip

Answer

Fracture of the neck of the femur

Question 10

What is reactive tuberculous arthritis known as?

Accepted Answer

Poncet's disease

Answer

Spina ventusa

Answer

Pott's disease

Answer

None of the above

Arthrology and Infections — MCQs

Arthrology and Infections — MCQs

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