Arthrology and Infections Practice Questions

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.

Q: Garre's chronic non-suppurative sclerosing osteomyelitis is characterized clinically by?

Periosteal bone formation. **Explanation:** **Garre’s Sclerosing Osteomyelitis** is a specific type of chronic osteomyelitis characterized by a low-grade, non-suppurative inflammatory response. It typically affects children and young adults, most commonly involving the **mandible** or the **tibia**. **1. Why Periosteal Bone Formation is Correct:** The hallmark of Garre’s osteomyelitis is a **reactive periosteal thickening**. The low-grade irritation stimulates the periosteum to lay down new bone in concentric layers. On imaging, this presents as the classic **"Onion-skin" appearance** (laminated periosteal reaction). This leads to a clinical thickening of the bone without the formation of pus, sequestrum, or involucrum. **2. Why the Other Options are Incorrect:** * **A. Endosteal bone formation:** While there may be some secondary narrowing of the medullary canal due to sclerosis, the primary clinical and radiological feature defining Garre’s is the subperiosteal deposition of new bone, not endosteal growth. * **C & D. Resorption of bone:** Garre’s is a **sclerotic (formative)** lesion, not a lytic (destructive) one. Resorption of medullary or cortical bone is characteristic of acute pyogenic osteomyelitis or aggressive tumors, whereas Garre’s is defined by its "non-suppurative" and bone-forming nature. **NEET-PG High-Yield Pearls:** * **Most common site:** Mandible (often associated with dental caries/periapical infection). * **Key X-ray finding:** "Onion-skin" appearance (must be differentiated from Ewing’s Sarcoma). * **Clinical feature:** Bony hard swelling with minimal pain and **no discharging sinuses** (since it is non-suppurative). * **Treatment:** Primarily conservative (antibiotics and removal of the source of infection, e.g., tooth extraction); surgery is rarely required.

Q: Which of the following is true regarding acute pyogenic osteomyelitis?

Cloacae are discharging sinuses.. **Explanation:** Acute pyogenic osteomyelitis is a bacterial infection of the bone, most commonly caused by *Staphylococcus aureus*. **Why Option D is Correct:** In the pathology of chronic osteomyelitis (which follows the acute phase), **Cloacae** are openings or gaps in the involucrum. These gaps allow for the exit of pus and necrotic debris (sequestrum) from the infected medullary cavity to the skin surface via **discharging sinuses**. **Analysis of Incorrect Options:** * **Option A:** The most common site is the **metaphysis**, not the diaphysis. This is due to the presence of "hairpin" loops of capillary vessels where blood flow slows down, allowing bacteria to settle (sludging). * **Option B:** The definitions are reversed. **Sequestrum** is a piece of dead bone that has become detached from healthy bone, while **Involucrum** is the layer of new, reactive bone that forms around the sequestrum. * **Option C:** The most common mode of infection, especially in children, is **hematogenous spread** (blood-borne), not direct inoculation. Direct inoculation is more common in adults following open fractures or surgery. **High-Yield Clinical Pearls for NEET-PG:** * **Most common organism:** *Staphylococcus aureus* (overall). * **Sickle cell patients:** *Salmonella* is a high-yield association. * **Earliest X-ray sign:** Soft tissue swelling (seen at 3–5 days). Bony changes (rarefaction) take 10–14 days to appear. * **Investigation of choice:** **MRI** is the most sensitive and specific early investigation. * **Brodie’s Abscess:** A form of subacute osteomyelitis characterized by a radiolucent lesion with a sclerotic rim.

Q: Which of the following is FALSE about fibrous ankylosis?

Is a complication of septic arthritis. ### Explanation In orthopaedics, ankylosis refers to the stiffness or fixation of a joint. It is broadly classified into **Bony Ankylosis** (true) and **Fibrous Ankylosis** (false). **Why Option A is the Correct (False) Statement:** Septic arthritis is characterized by the release of proteolytic enzymes by bacteria and polymorphonuclear leukocytes. These enzymes rapidly destroy the articular cartilage, leading to bone-on-bone contact. As the infection heals, new bone forms across the joint space, typically resulting in **Bony Ankylosis**. Therefore, stating that fibrous ankylosis is a complication of septic arthritis is incorrect; it is the classic cause of bony ankylosis. **Analysis of Other Options:** * **Option B (Is painful):** Fibrous ankylosis involves the presence of fibrous tissue between joint surfaces. Because this tissue can stretch and pull on sensitive structures during movement, it is characteristically **painful**. (In contrast, bony ankylosis is painless). * **Option C (Movement is possible):** In fibrous ankylosis, there is "shaking" or a few degrees of restricted, painful movement. In bony ankylosis, movement is zero. * **Option D (Most common cause is TB hip):** Tuberculosis of the joints (like the hip) is a "cold" infection that lacks proteolytic enzymes. It destroys the joint slowly, leading to healing by fibrous scarring rather than bone formation. Thus, **TB is the most common cause of fibrous ankylosis**. **High-Yield Clinical Pearls for NEET-PG:** * **Bony Ankylosis:** Seen in Septic Arthritis and Ankylosing Spondylitis. It is painless with zero movement. * **Fibrous Ankylosis:** Seen in Tuberculosis and Rheumatoid Arthritis. It is painful with slight movement. * **X-ray Distinction:** Bony ankylosis shows trabecular bone crossing the joint space; fibrous ankylosis shows a blurred joint space without bony bridges.

Q: Charcot's joint includes all of the following conditions EXCEPT:

Arthrogryposis multiplex congenita. **Explanation:** **Charcot’s Joint (Neuropathic Arthropathy)** is a progressive degenerative condition characterized by joint destruction, bone resorption, and deformity resulting from a **loss of pain and proprioceptive sensation**. When a joint loses its protective sensory feedback, repetitive microtrauma leads to progressive joint damage. **Why Arthrogryposis Multiplex Congenita (AMC) is the Correct Answer:** AMC is a non-progressive congenital disorder characterized by multiple joint contractures (stiff joints) present at birth. It is caused by fetal akinesia (decreased fetal movement) and muscle weakness, not by sensory loss. Therefore, it does not lead to the destructive, neuropathic changes seen in Charcot’s joint. **Analysis of Incorrect Options:** * **Diabetes Mellitus:** Currently the **most common cause** of Charcot’s joint, typically affecting the **foot and ankle** (Tarsometatarsal joints). * **Syringomyelia:** A classic cause that typically affects the **upper limb** (Shoulder and Elbow) due to the involvement of the cervical spinal cord. * **Leprosy:** A major cause in developing countries. Peripheral nerve damage leads to sensory loss, commonly resulting in Charcot’s changes in the hands and feet. **NEET-PG High-Yield Pearls:** * **The "6 D’s" of Charcot’s Joint:** Distension, Density (increased), Debris, Dislocation, Disorganization, and Destruction. * **Classic Distribution:** * **Diabetes:** Foot and Ankle (Midfoot). * **Syringomyelia:** Shoulder/Elbow. * **Tabes Dorsalis (Syphilis):** Knee (Historically common, now rare). * **Clinical Paradox:** The joint often looks "horrible" on X-ray (severe destruction) but is relatively **painless** for the patient.

Q: Which of the following is false regarding chronic osteomyelitis?

Negative pressure wound therapy uses a pressure of -60 mmHg. ### Explanation **Chronic Osteomyelitis** is a persistent infection of the bone characterized by the presence of a **sequestrum** (dead bone), **involucrum** (new bone sheath), and **cloaca** (opening for pus drainage). **Why Option D is False:** Negative Pressure Wound Therapy (NPWT), often used in managing complex wounds in chronic osteomyelitis, typically utilizes a sub-atmospheric pressure of **-125 mmHg**. A pressure of -60 mmHg is generally considered insufficient for optimal granulation tissue formation and exudate removal in standard orthopedic protocols. **Analysis of Other Options:** * **Option A (RIM Sign):** On T1-weighted MRI with contrast, the "Rim Sign" refers to a well-defined layer of granulation tissue surrounding a sequestrum or abscess (Brodie’s abscess). It is highly suggestive of chronic osteomyelitis. * **Option B (Amyloidosis):** Chronic osteomyelitis is a classic cause of **Secondary (AA) Amyloidosis** due to prolonged systemic inflammation. This can eventually lead to renal failure. * **Option C (Cierny and Mader Classification):** This is the gold-standard clinical classification for chronic osteomyelitis. It stages the disease based on **Anatomic type** (medullary, superficial, localized, or diffuse) and **Host status** (systemic/local factors affecting healing). **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Bone Biopsy and Culture. * **X-ray Findings:** Sequestrum (most dense/radio-opaque) and Involucrum (least dense). * **Most Common Organism:** *Staphylococcus aureus*. * **Malignant Transformation:** Long-standing discharging sinuses can lead to **Squamous Cell Carcinoma** (Marjolin’s Ulcer). * **Treatment:** Radical debridement (Sequestrectomy and Saucerization) is the mainstay of treatment.

Q: What is the earliest radiological manifestation of TB of the hip joint?

Osteopenia. **Explanation:** The earliest radiological manifestation of Tuberculosis (TB) of the hip joint is **Osteopenia** (juxta-articular osteoporosis). This occurs due to increased vascularity and hyperemia associated with the chronic inflammatory process, which leads to the leaching of calcium from the bones surrounding the joint. On an X-ray, this appears as a "ground-glass" appearance or decreased bone density. **Analysis of Options:** * **A. Loss of joint space:** This is a later finding. In TB, joint space is initially **preserved** for a long time because the mycobacteria lack proteolytic enzymes (unlike pyogenic arthritis). Narrowing only occurs once the articular cartilage is destroyed by subchondral granulation tissue. * **B. Femoral head loss:** This represents advanced destruction (Stage of Arthritis/Erosion). It occurs much later in the disease progression as the infection leads to "wandering acetabulum" or pathological dislocation. * **C. Periosteal thickening:** While seen in some bone infections, it is not a hallmark or the earliest sign of TB hip. TB is primarily a "cold" and "lytic" process rather than a bone-forming one. **Clinical Pearls for NEET-PG:** * **Phemister’s Triad:** Characterizes TB of joints: (1) Juxta-articular osteopenia, (2) Peripheral osseous erosions, and (3) Gradual narrowing of the joint space. * **Earliest Sign:** The very first sign is often **soft tissue swelling**, but among bony radiological changes, **Osteopenia** is the earliest. * **Key Distinction:** In **Pyogenic Arthritis**, joint space loss is rapid and early; in **Tubercular Arthritis**, joint space loss is a late feature.

Q: What is chronic periostitis in children called?

Garre's osteomyelitis. **Explanation:** **Garre’s Osteomyelitis** (also known as Chronic Osteomyelitis with Proliferative Periostitis) is a specific type of chronic osteomyelitis characterized by a prominent **periosteal reaction** that leads to the formation of new bone. It typically occurs in children and young adults. The underlying medical concept is a low-grade, persistent infection (often staphylococcal) where the body’s immune response is robust enough to prevent suppuration (pus formation) but triggers the periosteum to lay down concentric layers of new bone, giving it a characteristic **"onion-skin" appearance** on X-ray. It most commonly affects the mandible or the tibia. **Analysis of Incorrect Options:** * **Cherubism:** A rare genetic disorder (not infectious) characterized by bilateral, painless, cystic expansion of the jaws, giving the child a "cherubic" facial appearance. * **Histiocytosis X (Langerhans Cell Histiocytosis):** A group of disorders involving abnormal proliferation of Langerhans cells. While it can cause "punched-out" bone lesions, it is a neoplastic/proliferative process, not chronic periostitis. * **Tuberculous Osteomyelitis:** Caused by *Mycobacterium tuberculosis*, it typically presents with "cold abscesses" and bone destruction (caries) rather than the reactive periosteal thickening seen in Garre’s. **NEET-PG High-Yield Pearls:** * **Classic X-ray finding:** "Onion-skin" appearance (concentric laminations of periosteal new bone). * **Common Site:** The Mandible (often associated with dental infections/caries). * **Key Feature:** It is a **non-suppurative** process; there is no drainage or sequestrum formation. * **Treatment:** Primarily involves removing the source of infection (e.g., tooth extraction or antibiotics); surgical resection is rarely needed.

Q: Wind Swept deformity is seen in which of the following conditions?

Rheumatoid arthritis. **Explanation:** **Wind-swept deformity** is a clinical finding where both knees are deviated in the same direction—one knee exhibits **genu valgum** (knock-knee) while the other exhibits **genu varum** (bow-leg). **Why Rheumatoid Arthritis (RA) is the correct answer:** In the context of adult orthopedics and rheumatology, wind-swept deformity is a classic late-stage manifestation of **Rheumatoid Arthritis**. It occurs due to asymmetrical joint destruction, ligamentous laxity, and muscle imbalances, leading to the characteristic lateral deviation of both knees. While it can also be seen in Osteoarthritis, it is a high-yield association for RA in competitive exams. **Analysis of Incorrect Options:** * **Ankylosing Spondylitis:** Primarily affects the axial skeleton (sacroiliac joints and spine). While it can involve peripheral joints (hips/shoulders), it typically leads to joint fusion (ankylosis) rather than the "wind-swept" angulation of the knees. * **Scurvy:** Vitamin C deficiency leads to subperiosteal hemorrhages and "pseudoparalysis." While it affects bone health (e.g., Wimberger’s ring sign), it does not typically present with this specific knee deformity. * **Rickets:** While Rickets is a common cause of genu valgum or genu varum in children, the term "wind-swept deformity" in a pediatric context specifically refers to **Vitamin D-resistant rickets** or severe nutritional rickets. However, given the standard NEET-PG options, RA is the most established association for this specific terminology. **High-Yield Clinical Pearls for NEET-PG:** * **Wind-swept Deformity:** Genu valgum on one side + Genu varum on the other. * **Other RA Hand Deformities:** Swan neck deformity, Boutonniere deformity, and Z-deformity of the thumb. * **Pediatric Note:** If the question specifically mentions a child with metabolic bone disease, Rickets becomes a strong contender; however, in a general clinical sense, RA is the classic answer.

Q: Garre's osteomyelitis is:

All of the above. **Explanation:** **Garre’s Osteomyelitis** (also known as Chronic Sclerosing Non-suppurative Osteomyelitis) is a specific type of chronic bone infection characterized by a low-grade inflammatory process that triggers intense periosteal reaction and bone formation rather than pus production or sequestration. 1. **Why Option D is Correct:** * **Chronic (Option A):** It is a chronic condition resulting from a low-grade, persistent infection (often *Staphylococcus aureus*). Unlike acute osteomyelitis, it lacks systemic symptoms like high fever or abscess formation. * **Mandibular Involvement (Option B):** In the head and neck region, the **mandible** is the most common site, often associated with periapical dental infections or caries in children and young adults. * **Sclerosis of Diaphysis (Option C):** In long bones (like the tibia or femur), it typically affects the **diaphysis**. It presents with significant subperiosteal new bone formation and cortical thickening (sclerosis), which gives the bone a dense, "swollen" appearance on X-ray. 2. **Clinical Pearls for NEET-PG:** * **Key Radiographic Feature:** The "Onion-skin" appearance (concentric layers of subperiosteal new bone) is a classic finding, which must be differentiated from Ewing’s Sarcoma. * **Distinguishing Feature:** Unlike typical chronic osteomyelitis, Garre’s **does not** show sequestrum (dead bone), involucrum, or sinus tract formation. * **Treatment:** Primarily involves addressing the source of infection (e.g., tooth extraction or long-term antibiotics). Surgery is rarely needed unless to rule out malignancy. * **Age Group:** Most commonly seen in children and adolescents.

Question 1

What is reactive tuberculous arthritis known as?

Accepted Answer

Poncet's disease

Answer

Spina ventusa

Answer

Pott's disease

Answer

None of the above

Question 2

Garre's chronic non-suppurative sclerosing osteomyelitis is characterized clinically by?

Accepted Answer

Periosteal bone formation

Answer

Endosteal bone formation

Answer

Resorption of medullary bone

Answer

Resorption of cortical bone

Question 3

Which of the following is true regarding acute pyogenic osteomyelitis?

Accepted Answer

Cloacae are discharging sinuses.

Answer

The most common site in bone is the diaphysis.

Answer

Sequestrum is the new bone formation surrounding involucrum.

Answer

The most common mode of infection is direct inoculation due to trauma.

Question 4

Which of the following is FALSE about fibrous ankylosis?

Accepted Answer

Is a complication of septic arthritis

Answer

Is painful

Answer

Movement is possible at the joint

Answer

Most common cause is tuberculosis of the hip

Question 5

Charcot's joint includes all of the following conditions EXCEPT:

Accepted Answer

Arthrogryposis multiplex congenita

Answer

Syringomyelia

Answer

Leprosy

Answer

Diabetes

Question 6

Which of the following is false regarding chronic osteomyelitis?

Accepted Answer

Negative pressure wound therapy uses a pressure of -60 mmHg

Answer

RIM sign on MRI

Answer

Leads to Amyloidosis

Answer

Cierny and Mader classification

Question 7

What is the earliest radiological manifestation of TB of the hip joint?

Accepted Answer

Osteopenia

Answer

Loss of joint space

Answer

Femoral head loss

Answer

Periosteal thickening

Question 8

What is chronic periostitis in children called?

Accepted Answer

Garre's osteomyelitis

Answer

Cherubism

Answer

Histiocytosis X

Answer

Tuberculous osteomyelitis

Question 9

Wind Swept deformity is seen in which of the following conditions?

Accepted Answer

Rheumatoid arthritis

Answer

Ankylosing spondylitis

Answer

Scurvy

Answer

Rickets

Question 10

Garre's osteomyelitis is:

Accepted Answer

All of the above

Answer

Chronic

Answer

Usually seen in the mandible

Answer

Associated with sclerosis of the diaphysis of long bones

Arthrology and Infections — MCQs

Arthrology and Infections — MCQs

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