Degenerative Disorders Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Degenerative Disorders. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Degenerative Disorders Indian Medical PG Question 1: Osteoarthritis is typically not seen in which of the following joints?
- A. Ankle joints (Correct Answer)
- B. Knee joints
- C. Hip joints
- D. First metacarpophalangeal joint
Degenerative Disorders Explanation: **Explanation:**
Primary **Osteoarthritis (OA)** is a degenerative joint disease that characteristically affects weight-bearing joints and specific small joints of the hand.
**Why Ankle Joints are the Correct Answer:**
The **ankle (talocrural) joint** is remarkably resistant to primary osteoarthritis. This is due to the unique properties of ankle cartilage, which is thinner but has higher proteoglycan density and lower water content compared to the knee or hip, making it more resistant to compressive forces. While the ankle is a weight-bearing joint, OA here is almost always **secondary** (e.g., following intra-articular fractures, ligamentous instability, or rheumatoid arthritis) rather than primary/idiopathic.
**Analysis of Incorrect Options:**
* **Knee Joints:** The most common site for primary OA. It typically involves the medial compartment due to the mechanical axis of the lower limb.
* **Hip Joints:** A major weight-bearing joint frequently affected by primary OA, often leading to total hip arthroplasty in elderly patients.
* **First Metacarpophalangeal (MCP) Joint:** While OA commonly affects the **First Carpometacarpal (CMC)** joint (base of the thumb) and the **Distal Interphalangeal (DIP)** joints (Heberden’s nodes), the first MCP joint is also a recognized site for degenerative changes due to the high stresses of pinch and grip.
**High-Yield Clinical Pearls for NEET-PG:**
* **Nodal Distribution:** OA typically affects DIP joints (Heberden’s nodes) and PIP joints (Bouchard’s nodes). **MCP joints (except the 1st) and wrists are usually spared** (if involved, think Rheumatoid Arthritis).
* **Radiological Hallmarks:** Joint space narrowing (asymmetrical), subchondral sclerosis, subchondral cysts, and osteophyte formation.
* **Kellgren-Lawrence Grading:** The standard radiological classification system for OA severity.
* **Eburnation:** A pathological feature where subchondral bone becomes polished and ivory-like due to complete loss of overlying cartilage.
Degenerative Disorders Indian Medical PG Question 2: Frieberg's disease involves which of the following?
- A. Tibial tuberosity
- B. Calcaneal tuberosity
- C. 2nd metatarsal (Correct Answer)
- D. 5th metatarsal
Degenerative Disorders Explanation: **Explanation:**
**Freiberg’s disease** is an **osteochondrosis** (avascular necrosis) affecting the head of the metatarsal. It most commonly involves the **2nd metatarsal head (Option C)** because it is the longest and most rigid metatarsal, making it susceptible to repetitive microtrauma and excessive loading during the toe-off phase of gait. It is typically seen in adolescent girls and presents with pain, swelling, and limited range of motion at the metatarsophalangeal joint.
**Analysis of Incorrect Options:**
* **Option A (Tibial tuberosity):** This is the site for **Osgood-Schlatter disease**, a traction apophysitis caused by repetitive strain from the patellar tendon.
* **Option B (Calcaneal tuberosity):** This is the site for **Sever’s disease**, an apophysitis of the calcaneus common in active children.
* **Option D (5th metatarsal):** The base of the 5th metatarsal is the site for **Iselin’s disease** (apophysitis). While the 5th metatarsal is also prone to Jones fractures, it is not the classic site for Freiberg’s.
**High-Yield Clinical Pearls for NEET-PG:**
* **Demographics:** Most common in adolescent females (ratio ~3:1).
* **Radiology:** Early stages show flattening and sclerosis of the metatarsal head; late stages show joint space narrowing and secondary osteoarthritis.
* **Hierarchy of Involvement:** 2nd Metatarsal (most common) > 3rd Metatarsal > 4th Metatarsal.
* **Management:** Conservative (activity modification, orthotics) is first-line; surgery (debridement or osteotomy) is reserved for refractory cases.
Degenerative Disorders Indian Medical PG Question 3: A 56-year-old Type II diabetic presents with complaints of swelling in the left ankle with effusion but only minimal pain. X-rays show severe osteopenia with bone destruction, extensive osteophytosis, and loose bodies. Which of the following is NOT a component of the management of this patient?
- A. Resting and splinting
- B. Aspiration and compression bandage
- C. Total ankle replacement (Correct Answer)
- D. Ankle arthrodesis
Degenerative Disorders Explanation: ### **Explanation**
The clinical presentation of a diabetic patient with a swollen, effused ankle, minimal pain despite severe radiological destruction (osteopenia, osteophytosis, and loose bodies), is classic for **Charcot’s Arthropathy (Neuropathic Joint)**.
#### **Why Total Ankle Replacement (TAR) is NOT recommended:**
Total Ankle Replacement is **contraindicated** in Charcot’s neuroarthropathy. The underlying pathology involves a loss of protective sensation and autonomic dysfunction, leading to repetitive microtrauma and bone collapse. Because the bone quality is poor (severe osteopenia/destruction) and the joint is unstable due to ligamentous laxity, a prosthetic implant would lack the necessary structural support, leading to early loosening, periprosthetic fracture, and high rates of infection or amputation.
#### **Analysis of Other Options:**
* **Resting and splinting (A):** This is the cornerstone of management during the acute (Eichenholtz Stage 0 or I) phase to prevent further bone destruction and deformity.
* **Aspiration and compression bandage (B):** Used to manage significant joint effusion and reduce swelling, which helps in decreasing inflammatory markers and improving skin integrity.
* **Ankle arthrodesis (D):** While challenging, surgical fusion (arthrodesis) is a recognized treatment for late-stage, unstable Charcot joints to provide a stable, plantigrade foot, especially when conservative measures fail.
#### **Clinical Pearls for NEET-PG:**
* **The "6 D’s" of Charcot Joint:** Destruction, Debris, Density (increased/sclerosis), Disorganization, Dislocation, and Distension.
* **Most common cause:** Diabetes Mellitus (affects foot/ankle). Other causes include Syphilis (Tabes dorsalis - affects knee) and Syringomyelia (affects shoulder/elbow).
* **Clinical Paradox:** The hallmark is the **disparity** between the severe radiographic destruction and the relatively painless clinical presentation.
* **Treatment Goal:** The primary goal is a stable, infection-free, plantigrade foot; mobility (via replacement) is sacrificed for stability.
Degenerative Disorders Indian Medical PG Question 4: What is the deformity most commonly seen in primary osteoarthritis of the knee joint?
- A. Genu valgum
- B. Genu recurvatum
- C. Genu varus (Correct Answer)
- D. Procurvatum
Degenerative Disorders Explanation: ### Explanation
**Correct Answer: C. Genu varus**
In primary osteoarthritis (OA) of the knee, the **medial compartment** is the most common site of cartilage degeneration. This occurs because the mechanical axis of the lower limb normally passes slightly medial to the center of the knee joint, causing the medial compartment to bear approximately 60-70% of the load during walking. As the medial articular cartilage thins and the joint space narrows, the tibia tilts medially relative to the femur, resulting in a **bow-legged** appearance known as **Genu varus**.
**Analysis of Incorrect Options:**
* **A. Genu valgum (Knock-knees):** This is less common in primary OA. It occurs when the lateral compartment undergoes preferential degeneration. It is more frequently associated with Rheumatoid Arthritis or secondary OA.
* **B. Genu recurvatum:** This refers to hyperextension of the knee. It is typically caused by ligamentous laxity (e.g., polio, Ehlers-Danlos syndrome) or quadriceps weakness, rather than primary degenerative changes.
* **D. Procurvatum:** This is a forward bowing of the bone (fixed flexion deformity). While OA can lead to a fixed flexion deformity due to posterior capsular contracture, "Genu varus" is the classic coronal plane deformity described.
**Clinical Pearls for NEET-PG:**
* **Kellgren-Lawrence Grading:** The standard radiological classification for OA (Grade 0-4), based on joint space narrowing, osteophytes, and sclerosis.
* **First Sign on X-ray:** Often subchondral sclerosis or small osteophytes; however, joint space narrowing is the hallmark.
* **Management:** High Tibial Osteotomy (HTO) is a high-yield surgical option for young, active patients with isolated medial compartment OA and varus deformity to realign the weight-bearing axis.
* **Heberden’s Nodes:** Found at the DIP joints (characteristic of primary OA).
Degenerative Disorders Indian Medical PG Question 5: Stress fracture occurs most commonly in which of the following bones?
- A. Metatarsals (Correct Answer)
- B. Metacarpals
- C. Calcaneum
- D. Talus
Degenerative Disorders Explanation: **Explanation:**
A **stress fracture** (also known as a fatigue fracture) occurs due to repetitive mechanical stress or rhythmic muscle action on a bone that has not had time to adapt to the load. Unlike traumatic fractures, these result from cumulative micro-trauma.
**Why Metatarsals are correct:**
The **metatarsals** are the most common site for stress fractures in the human body, specifically the **second and third metatarsals**. This is because they are relatively thin and rigid compared to the first metatarsal, bearing significant weight during the "toe-off" phase of the gait cycle. When occurring in the metatarsal shaft, it is classically referred to as a **"March Fracture,"** historically associated with military recruits or long-distance runners.
**Analysis of Incorrect Options:**
* **Metacarpals:** These are rare sites for stress fractures as they are not weight-bearing bones.
* **Calcaneum:** This is the **second most common** site for stress fractures. It typically presents with heel pain aggravated by the "squeeze test" (mediolateral compression of the calcaneus).
* **Talus:** While stress fractures can occur in the talar neck or body (often in athletes), they are significantly less common than those in the metatarsals or calcaneum.
**High-Yield Clinical Pearls for NEET-PG:**
* **Most common site overall:** 2nd Metatarsal (March Fracture).
* **Most common site in athletes:** Tibia (specifically the junction of the middle and lower thirds).
* **Investigation of Choice:** **MRI** is the most sensitive and specific early investigation (shows marrow edema).
* **X-ray findings:** Often negative in the first 2–3 weeks; later shows a faint hairline crack or exuberant callus formation.
* **Female Athlete Triad:** Amenorrhea, disordered eating, and osteoporosis significantly increase the risk of stress fractures.
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