Arthrology and Infections Practice Questions

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: What is the earliest site of bone involvement in hematogenous osteomyelitis?

Metaphysis. **Explanation:** Hematogenous osteomyelitis most commonly affects the **metaphysis** of long bones (especially around the knee) due to its unique vascular anatomy. The nutrient artery terminates in the metaphysis into **"hairpin loops"** of capillaries. These loops lead into large, thin-walled venous sinusoids where blood flow becomes sluggish and turbulent. This stasis allows circulating bacteria (most commonly *Staphylococcus aureus*) to settle, proliferate, and initiate an inflammatory response. Furthermore, the metaphyseal capillaries lack basement membranes and functional phagocytes, making the area highly susceptible to infection. **Analysis of Options:** * **B. Epiphysis:** Generally spared in children because the growth plate (physeal cartilage) acts as a mechanical barrier. It is only involved in infants (where transphyseal vessels exist) or in adults after the growth plate closes. * **C. Diaphysis:** While the infection can spread to the diaphysis via the medullary canal or subperiosteal space, it is rarely the primary site of origin, except in specific conditions like Sickle Cell Anemia (where *Salmonella* may affect the diaphysis). * **D. Apophysis:** These are accessory ossification centers (e.g., tibial tuberosity) that provide attachment for tendons. While they can be involved, they are not the primary site for hematogenous seeding. **NEET-PG High-Yield Pearls:** * **Most common organism:** *Staphylococcus aureus* (overall); *Salmonella* (in Sickle Cell patients). * **Earliest sign on X-ray:** Soft tissue swelling (appears at 3–5 days); bone changes (rarefaction/periosteal reaction) take **10–14 days** to appear. * **Investigation of choice:** **MRI** (most sensitive for early detection). * **Sequestrum:** Dead bone (radio-opaque); **Involucrum:** New bone formed under the periosteum (surrounds the sequestrum).

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: Clutton's joints are associated with which of the following?

Syphilitic joints. **Explanation:** **Clutton’s joints** are a classic manifestation of **Late Congenital Syphilis**. The condition is characterized by symmetrical, painless swelling of the joints, most commonly involving the **knees**. 1. **Why the correct answer is right:** Clutton’s joints represent a chronic hydrarthrosis (fluid accumulation) caused by a localized inflammatory response to *Treponema pallidum*. It typically appears between the ages of 8 and 15 years. The hallmark is a **painless, bilateral effusion** with a full range of motion and no significant bony destruction on X-ray. 2. **Why the incorrect options are wrong:** * **Option B (Tuberculous joints):** TB of the joints (like Pott’s spine or TB hip) is typically "cold" but destructive, leading to joint space narrowing, bony erosion, and eventually fibrous ankylosis (the "end stage"). It is rarely symmetrical or purely effusive like Clutton's. * **Option C (Trauma):** Traumatic effusions (hemarthrosis) are usually unilateral, acute in onset, and associated with significant pain and a history of injury. * **Option D (Painful joints):** This is a key distractor. Clutton’s joints are characteristically **painless** despite the marked swelling, which helps differentiate them from septic or rheumatoid arthritis. **High-Yield Clinical Pearls for NEET-PG:** * **Hutchinson’s Triad:** Often associated with Clutton's joints; includes Interstitial keratitis, Sensorineural deafness (8th nerve), and Hutchinson’s teeth (notched incisors). * **Synovial Fluid:** In Clutton’s joints, the fluid shows a predominance of lymphocytes. * **Treatment:** While the effusion is often self-limiting and does not respond significantly to penicillin, systemic treatment is required to manage the underlying syphilis.

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.

Q: What is the most common cause of fracture in hemophilic arthropathy?

Osteoporosis and restrictive joint movement. **Explanation:** In Hemophilic Arthropathy, the primary mechanism leading to fractures is the combination of **Osteoporosis and restrictive joint movement**. Recurrent hemarthrosis (bleeding into joints) leads to chronic synovitis. The iron (hemosiderin) deposition and inflammatory cytokines cause hyperemia of the epiphysis, which results in **disuse atrophy** and juxta-articular osteoporosis. Furthermore, repeated bleeds lead to fibrous ankylosis and muscle contractures, causing restrictive joint movement. This combination makes the bone brittle and increases the mechanical stress on the bone during minor trauma, leading to fractures. **Analysis of Incorrect Options:** * **B. Cartilage destruction:** While cartilage destruction is a hallmark of late-stage hemophilic arthropathy (due to proteolytic enzymes), it leads to joint space narrowing and deformity rather than being the direct cause of a bone fracture. * **C. Inflammatory arthropathy:** Although the process involves inflammation (synovitis), the term is too broad. The specific sequelae of inflammation—osteoporosis—is what directly predisposes the bone to fracture. * **D. Osteosclerosis:** This refers to increased bone density. In hemophilia, the bone density actually decreases (osteoporosis), making this option the physiological opposite of what occurs. **NEET-PG High-Yield Pearls:** * **Earliest sign of Hemophilic Arthropathy:** Soft tissue swelling. * **Most common joint involved:** Knee > Elbow > Ankle. * **Radiological Signs:** Widening of the intercondylar notch of the femur and "squaring" of the inferior pole of the patella (Jordan’s Sign). * **Classification:** The **Arnold-Hilgartner classification** is used to stage hemophilic arthropathy.

Q: Which of the following are common sites of tuberculous bursitis?

Prepatellar. **Explanation:** Tuberculous bursitis is a chronic granulomatous inflammation of the bursa caused by *Mycobacterium tuberculosis*. It usually occurs secondary to an underlying bone or joint focus or via hematogenous spread. **Why Prepatellar is the Correct Answer:** The **prepatellar bursa** is the most common site for tuberculous bursitis. This is primarily because of its superficial location, making it more susceptible to repeated minor trauma, which can localize a hematogenous infection. Clinically, it presents as a "cold swelling" over the patella with minimal pain, often mimicking a chronic non-specific bursitis (Housemaid’s knee) but with thicker walls and potentially "rice bodies" (fibrin masses) within the fluid. **Analysis of Other Options:** * **Subacromial and Subdeltoid (B & C):** While tuberculosis can affect these bursae, it is significantly less common than the prepatellar site. When it occurs here, it is often associated with tuberculosis of the shoulder joint or the greater tuberosity of the humerus. * **Trochanteric (D):** Trochanteric tuberculous bursitis is a well-known entity but is less frequent than prepatellar involvement. It typically presents with pain over the lateral aspect of the hip and may be associated with underlying trochanteric bone erosion. **High-Yield Clinical Pearls for NEET-PG:** * **Rice Bodies:** These are pathognomonic macroscopic findings in TB bursitis/tenosynovitis, representing organized fibrin. * **Compound Palmar Ganglion:** This is a classic presentation of TB tenosynovitis involving the common flexor sheath of the wrist, characterized by a cross-fluctuant swelling above and below the flexor retinaculum. * **Diagnosis:** Gold standard is a biopsy of the bursa wall showing caseating granulomas and AFB (Acid Fast Bacilli) culture. * **Treatment:** Standard anti-tubercular therapy (ATT) for 6–9 months; surgical excision is reserved for persistent or recurrent cases.

Question 1

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

Accepted Answer

Arthrogryposis multiplex congenita

Answer

Syringomyelia

Answer

Leprosy

Answer

Diabetes

Question 2

What is the earliest site of bone involvement in hematogenous osteomyelitis?

Accepted Answer

Metaphysis

Answer

Epiphysis

Answer

Diaphysis

Answer

Apophysis

Question 3

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 4

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 5

What is chronic periostitis in children called?

Accepted Answer

Garre's osteomyelitis

Answer

Cherubism

Answer

Histiocytosis X

Answer

Tuberculous osteomyelitis

Question 6

Clutton's joints are associated with which of the following?

Accepted Answer

Syphilitic joints

Answer

End stage Tuberculous joints

Answer

Joints associated with trauma

Answer

Usually painful joints

Question 7

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

Question 8

What is the most common cause of fracture in hemophilic arthropathy?

Accepted Answer

Osteoporosis and restrictive joint movement

Answer

Cartilage destruction

Answer

Inflammatory arthropathy

Answer

Osteosclerosis

Question 9

Which of the following are common sites of tuberculous bursitis?

Accepted Answer

Prepatellar

Answer

Subacromial

Answer

Subdeltoid

Answer

Trochanteric

Question 10

What is true about frozen shoulder?

Accepted Answer

Improves after intraarticular steroid injection.

Answer

May occur after myocardial infarction.

Answer

Seen following Colles' fracture.

Answer

Less commonly seen in diabetes.

Arthrology and Infections — MCQs

Arthrology and Infections — MCQs

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