Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 331: A 68-year-old female presents with a posterior displacement of the left distal wrist and hand after a fall. Radiographic examination reveals an oblique fracture of the radius. Which of the following is the most likely fracture involved in this case?

A. Colles' fracture (Correct Answer)
B. Scaphoid fracture
C. Bennett's fracture
D. Volkmann's ischemic contracture

Explanation: ### Explanation **Correct Option: A. Colles' fracture** A **Colles' fracture** is a distal radius fracture (usually within 2.5 cm of the wrist joint) characterized by **dorsal (posterior) displacement** and angulation of the distal fragment. It typically occurs in elderly, osteoporotic women following a fall on an outstretched hand (FOOSH). The classic clinical appearance is the **"Dinner Fork Deformity."** In this case, the patient’s age, mechanism of injury, and posterior displacement of the distal wrist are pathognomonic for Colles' fracture. **Why the other options are incorrect:** * **B. Scaphoid fracture:** This is the most common carpal bone fracture. It presents with tenderness in the **anatomical snuffbox**, not a gross posterior displacement of the distal radius. * **C. Bennett's fracture:** This is an intra-articular fracture-subluxation at the **base of the first metacarpal** (thumb). It does not involve the distal radius or cause a dinner fork deformity. * **D. Volkmann's ischemic contracture (VIC):** This is a **sequela (complication)** of untreated compartment syndrome, often following supracondylar fractures of the humerus. It is a permanent flexion deformity of the wrist and fingers due to muscle ischemia, not an acute fracture. **High-Yield Clinical Pearls for NEET-PG:** * **Smith’s Fracture:** Often called a "Reverse Colles," it involves **ventral (palmar)** displacement of the distal radius fragment. * **Barton’s Fracture:** An intra-articular oblique fracture of the distal radius with associated subluxation of the carpus. * **Chauffeur’s Fracture:** An intra-articular fracture of the **radial styloid process**. * **Eponymous Deformity:** Remember, Colles = Dinner Fork; Smith = Garden Spade.

Question 332: What is the earliest symptom of Volkmann's ischemic contracture?

A. Pain in flexor muscles
B. Absence of pulse
C. Pain on passive extension (Correct Answer)
D. Cyanosis of the limb

Explanation: **Explanation:** Volkmann’s Ischemic Contracture (VIC) is the permanent sequela of untreated **Compartment Syndrome**, most commonly following supracondylar fractures of the humerus. **Why "Pain on Passive Extension" is correct:** The earliest and most sensitive clinical indicator of impending ischemia in the muscle compartment is **pain out of proportion to the injury**. Specifically, **pain on passive stretching** of the ischemic muscles (e.g., extending the fingers to stretch the flexor digitorum profundus) is the hallmark sign. This occurs because stretching the already ischemic, swollen muscle fibers increases intracompartmental pressure and triggers nociceptors before other neurological or vascular deficits appear. **Analysis of Incorrect Options:** * **Pain in flexor muscles (A):** While pain is present, it is subjective and non-specific. Passive stretch pain is a more reliable early clinical test. * **Absence of pulse (B):** This is a **late sign**. Compartment syndrome is a microvascular phenomenon; the systolic pressure often remains high enough to maintain a distal pulse even while the capillary perfusion to muscles has ceased. * **Cyanosis of the limb (D):** This indicates advanced venous congestion or late-stage ischemia and is not an early diagnostic symptom. **High-Yield Clinical Pearls for NEET-PG:** * **The 5 P’s:** Pain (earliest), Pallor, Paresthesia, Pulselessness (late), and Paralysis (late). * **Most common site:** Deep flexor compartment of the forearm (Flexor Digitorum Profundus and Flexor Pollicis Longus). * **Diagnosis:** Primarily clinical. If doubtful, measure intracompartmental pressure (Stryker monitor); a **Delta pressure** (Diastolic BP – Compartment pressure) **< 30 mmHg** is diagnostic. * **Management:** Immediate removal of tight bandages/casts; if no improvement, emergency **fasciotomy**.

Question 333: Kienbock disease is avascular necrosis of which carpal bone?

A. Scaphoid
B. Trapezoid
C. Trapezium
D. Lunate (Correct Answer)

Explanation: **Explanation:** **Kienbock’s disease** is defined as idiopathic **avascular necrosis (AVN) of the Lunate bone**. The lunate is particularly susceptible to ischemia because it often relies on a single nutrient artery (Y or X-shaped vascular pattern) and is subjected to significant compressive forces between the radius and the rest of the carpus. * **Why Lunate is correct:** The disease typically affects young adults (20–40 years) and is strongly associated with **Negative Ulnar Variance** (a shorter ulna relative to the radius). This anatomical variation leads to increased mechanical loading on the lunate, resulting in microfractures, vascular compromise, and eventual bony collapse. **Analysis of Incorrect Options:** * **Scaphoid:** While the scaphoid is the most commonly fractured carpal bone and frequently develops AVN *post-trauma* (due to its retrograde blood supply), idiopathic AVN of the scaphoid is known as **Preiser’s disease**. * **Trapezium & Trapezoid:** These bones are rarely involved in isolated AVN. The Trapezium is more clinically significant for being the most common site of carpal osteoarthritis (first carpometacarpal joint). **High-Yield Clinical Pearls for NEET-PG:** * **Radiographic Sign:** Increased density (sclerosis) of the lunate on X-ray is the earliest sign. * **Classification:** The **Lichtman Classification** is used to stage the disease (Stage I: Normal X-ray; Stage IV: Pancarpal arthritis). * **MRI:** The investigation of choice for early diagnosis (shows decreased T1 signal). * **Treatment:** Early stages with negative ulnar variance are often treated with **Radial Shortening Osteotomy** to decompress the lunate.

Question 334: Which of the following factors favor fat embolism in a trauma patient?

A. Diabetes Mellitus
B. Mobility of joint
C. Respiratory failure
D. Hypovolemic shock (Correct Answer)

Explanation: **Explanation:** Fat Embolism Syndrome (FES) typically occurs following fractures of long bones (like the femur) or the pelvis. The pathophysiology involves the release of fat globules from the bone marrow into the systemic circulation. **Why Hypovolemic Shock is the correct answer:** Hypovolemic shock is a major predisposing factor for fat embolism. In a state of shock, there is **decreased systemic blood flow and stasis** in the microcirculation. This sluggish flow allows fat globules to coalesce and obstruct small capillaries more easily. Furthermore, shock triggers a systemic inflammatory response that increases the permeability of the lung capillaries, exacerbating the damage caused by the biochemical breakdown of fat into free fatty acids (the "Chemical Theory" of FES). **Analysis of Incorrect Options:** * **A. Diabetes Mellitus:** While DM affects bone healing and vascular health, it is not a direct predisposing factor for the mechanical release or systemic manifestation of fat emboli. * **B. Mobility of joint:** While movement of the *fracture site* (not the joint specifically) can theoretically increase marrow pressure, the gold standard for preventing FES is **early stabilization/fixation** of the fracture. Joint mobility itself is not a recognized risk factor. * **C. Respiratory failure:** This is a **consequence** (clinical feature) of fat embolism, not a factor that favors its occurrence. **High-Yield Clinical Pearls for NEET-PG:** * **Gurd’s Criteria:** Used for diagnosis. Major signs include **Petechial rash** (vest distribution/axilla), respiratory insufficiency, and cerebral involvement (confusion). * **Snowstorm Appearance:** Classic finding on Chest X-ray (diffuse pulmonary infiltrates). * **Management:** Primarily supportive (Oxygenation/Ventilation). Early splintage and operative fixation of fractures are the most effective preventive measures.

Question 335: A patient with a history of road traffic accident (RTA) presents to the emergency department with an open injury classified as Gustilo-Anderson type III B. What does this classification indicate?

A. Limb wound greater than 10 cm with extensive laceration
B. Limb wound less than 1 cm
C. Limb wound greater than 10 cm with extensive soft tissue damage and periosteal stripping (Correct Answer)
D. Wound between 1 and 10 cm in length, without extensive soft tissue damage, flaps, or avulsion

Explanation: The **Gustilo-Anderson Classification** is the gold standard for grading open fractures, primarily based on the energy of the injury, the extent of soft tissue damage, and the degree of contamination. ### **Explanation of the Correct Answer** **Option C** is correct because **Type III B** injuries are high-energy fractures characterized by extensive soft tissue laceration or flaps with **periosteal stripping** and bone exposure. The defining clinical feature of III B is that the soft tissue injury is so severe that it **cannot provide adequate coverage** for the bone, necessitating a plastic surgical procedure (like a flap) for coverage. ### **Analysis of Incorrect Options** * **Option A (Type III A):** While the wound is >10 cm with extensive laceration, there is still **adequate soft tissue coverage** of the bone despite the high-energy nature of the trauma. * **Option B (Type I):** This describes a low-energy injury with a clean wound **less than 1 cm** in length, usually a "poke-out" injury from within. * **Option D (Type II):** This describes a wound **between 1 and 10 cm** in length. There is moderate soft tissue damage, but no extensive flaps, avulsions, or crushed tissue. ### **High-Yield NEET-PG Pearls** * **Type III C:** Any open fracture associated with an **arterial injury** requiring repair, regardless of the wound size. * **Automatic Type III:** Farm injuries, high-velocity gunshot wounds, and injuries occurring in highly contaminated water are automatically classified as Type III. * **Antibiotic Choice:** * Type I & II: 1st generation Cephalosporins. * Type III: Cephalosporins + Aminoglycosides (add Penicillin if anaerobic/soil contamination is suspected). * **Time Factor:** The most critical factor in preventing infection is the **time to surgical debridement** and administration of antibiotics.

Question 336: "Figure of Eight" bandage is commonly used in the management of which of the following fractures?

A. Scapula
B. Humerus
C. Clavicle (Correct Answer)
D. Metacarpals

Explanation: ### Explanation **Correct Option: C (Clavicle)** The "Figure of Eight" bandage is a classic conservative management technique for **Clavicle fractures**, particularly those involving the middle third (the most common site). The bandage works by pulling both shoulders upwards and backwards (retraction). This action helps to counteract the typical displacement where the medial fragment is pulled upward by the Sternocleidomastoid muscle and the lateral fragment is pulled downward and inward by the weight of the arm and Pectoralis major. By maintaining this position, it helps in aligning the fragments and reducing pain during the healing process. **Analysis of Incorrect Options:** * **A. Scapula:** Most scapular fractures are managed conservatively with a simple **U-slab or a triangular broad arm sling** to support the weight of the limb. * **B. Humerus:** Depending on the site, humerus fractures are managed with a **U-slab, hanging cast, or Coaptation splint**. A figure of eight bandage provides no stabilization for the humeral shaft or neck. * **C. Metacarpals:** These are typically managed with **Cock-up splints, volar slabs, or "Buddy taping"** (for phalanges/metacarpals) to maintain reduction. **NEET-PG High-Yield Pearls:** * **Most common site of Clavicle fracture:** Junction of the medial 2/3rd and lateral 1/3rd (the weakest point where the curvature changes). * **Current Trend:** While the Figure of Eight bandage is a classic textbook answer, recent clinical practice often prefers a **simple triangular broad arm sling**, as it is more comfortable for the patient and shows similar functional outcomes. * **Complication:** The most common complication of clavicle fractures is **Malunion** (resulting in a visible bump), but it is usually clinically insignificant. Non-union is rare. * **First Bone to Ossify:** The clavicle is the first bone in the body to ossify (via intramembranous ossification).

Question 337: What is the most common associated injury with a fracture of the medial epicondyle?

A. Elbow dislocation (Correct Answer)
B. Monteggia fracture-dislocation
C. Supracondylar humerus fracture
D. Vascular deficit

Explanation: **Explanation:** **1. Why Elbow Dislocation is Correct:** Fractures of the medial epicondyle are common pediatric elbow injuries, typically occurring between the ages of 9 and 14. The most common associated injury is **elbow dislocation**, which occurs in approximately **30–50%** of cases. The mechanism usually involves a valgus stress combined with a sudden contraction of the forearm flexor-pronator mass. As the elbow dislocates (usually posterolaterally), the medial epicondyle is avulsed. Crucially, as the dislocation reduces, the medial epicondyle fragment can become **incarcerated (trapped)** within the joint space, which is a classic surgical indication. **2. Why the Other Options are Incorrect:** * **Monteggia fracture-dislocation:** This involves a proximal ulna fracture with a radial head dislocation. While it is a significant pediatric injury, it is not specifically linked to medial epicondyle avulsions. * **Supracondylar humerus fracture:** This is the most common pediatric elbow fracture overall, but it is a distinct clinical entity with a different mechanism (extension-type fall) and is not typically "associated" with a medial epicondyle fracture. * **Vascular deficit:** While common in supracondylar fractures (brachial artery involvement), vascular injury is rare in medial epicondyle fractures. The more common neurological association here is **Ulnar nerve palsy**. **3. High-Yield Clinical Pearls for NEET-PG:** * **Ossification Center:** The medial epicondyle is the "M" in CRITOE; it typically appears at age 5–7 and is the last to fuse (around age 18–20). * **Incarceration:** Always check for a "missing" epicondyle on X-ray after an elbow dislocation reduction; if the joint space is widened, the fragment is likely trapped inside. * **Nerve Injury:** The **Ulnar nerve** is the most commonly injured nerve due to its proximity to the medial epicondyle. * **Absolute Indication for Surgery:** Open fractures or an incarcerated fragment that cannot be removed by closed means (e.g., Roberts’ maneuver).

Question 338: Essex-Lopresti is a fracture of what?

A. Radial head with ulnar styloid
B. Radial head with interosseous membrane (Correct Answer)
C. Radial head with ulnar head
D. Radial head alone

Explanation: **Explanation:** The **Essex-Lopresti fracture-dislocation** is a complex injury of the forearm characterized by a longitudinal disruption of the forearm's stability. It involves a triad of injuries: 1. **Comminuted fracture of the radial head.** 2. **Rupture of the interosseous membrane (IOM).** 3. **Dislocation of the Distal Radioulnar Joint (DRUJ).** The underlying mechanism is usually a high-energy fall on an outstretched hand. The force is transmitted proximally from the wrist, tearing the IOM and fracturing the radial head. Because the IOM is torn, the radius migrates proximally (proximal migration of the radius), leading to incongruity and dislocation at the DRUJ. **Analysis of Options:** * **Option B (Correct):** Accurately identifies the involvement of the radial head and the interosseous membrane, which is the hallmark of this longitudinal instability. * **Option A & C:** While the ulnar head or styloid may occasionally be involved in complex trauma, they are not the defining components of an Essex-Lopresti injury. * **Option D:** A radial head fracture alone is a simple fracture; it lacks the longitudinal instability and IOM involvement required for this eponym. **High-Yield Clinical Pearls for NEET-PG:** * **The "Don't Miss" Rule:** Always palpate the wrist in every radial head fracture. Pain at the DRUJ suggests an Essex-Lopresti injury. * **Management:** Excision of the radial head is **contraindicated** as it leads to further proximal migration of the radius. Treatment usually involves ORIF or replacement of the radial head to maintain forearm length. * **Comparison:** * **Galeazzi:** Distal radius fracture + DRUJ dislocation. * **Monteggia:** Proximal ulnar fracture + Radial head dislocation. * **Essex-Lopresti:** Radial head fracture + IOM tear + DRUJ dislocation.

Question 339: Which of the following statements regarding dislocation of the hip joint is true?

A. Posterior dislocation is commoner.
B. In posterior dislocation, the whole lower limb is rotated medially.
C. In anterior dislocation, the whole lower limb is rotated laterally.
D. All of the above. (Correct Answer)

Explanation: Hip dislocations are high-energy traumatic injuries, most commonly occurring during motor vehicle accidents (e.g., dashboard injuries). **Explanation of Options:** * **Option A:** **Posterior dislocation** is the most common type, accounting for approximately **90%** of all hip dislocations. It typically occurs when the knee strikes the dashboard while the hip is flexed and adducted. * **Option B:** In **posterior dislocation**, the characteristic clinical deformity is **flexion, adduction, and internal (medial) rotation**. The femoral head is forced behind the acetabulum, and the tension of the external rotators is lost, leading to medial rotation. * **Option C:** In **anterior dislocation**, the limb is held in **flexion, abduction, and external (lateral) rotation**. This occurs when the hip is forced into extension and abduction (e.g., a fall from height). Since all three statements are anatomically and clinically accurate, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** 1. **The "Shortening" Rule:** The limb appears shortened in both anterior and posterior dislocations, but the rotation is the key differentiator (Posterior = Internal; Anterior = External). 2. **Nerve Injury:** The **Sciatic nerve** (specifically the peroneal division) is most commonly injured in posterior dislocations. 3. **Vascular Complication:** **Avascular Necrosis (AVN)** of the femoral head is the most dreaded complication. The risk increases significantly if the dislocation is not reduced within **6 hours**. 4. **X-ray Sign:** On an AP view, the femoral head appears **smaller** than the contralateral side in posterior dislocation and **larger** in anterior dislocation (due to magnification).

Question 340: After a joint injury, an 8-year-old child developed joint stiffness. Radiographs show the development of myositis ossificans. Which joint is most commonly involved?

A. Knee
B. Elbow (Correct Answer)
C. Shoulder
D. Hip

Explanation: **Explanation:** **Myositis Ossificans (MO)**, also known as post-traumatic ossification, is a condition characterized by the formation of heterotopic bone in soft tissues (muscles, ligaments, or fascia) following trauma. **Why Elbow is the Correct Answer:** The **elbow joint** is the most common site for myositis ossificans, particularly following a supracondylar fracture of the humerus or a posterior dislocation. The **Brachialis muscle** is the most frequently involved muscle due to its proximity to the distal humerus. In children, the periosteum is loosely attached and highly osteogenic; trauma causes a subperiosteal hematoma which, if aggravated by **vigorous massage** or forced passive stretching, leads to the migration of osteoblasts into the muscle, resulting in ectopic bone formation and joint stiffness. **Analysis of Incorrect Options:** * **Knee:** While the Quadriceps femoris is a common site for MO (often called "rider's bone" or "charley horse"), it occurs less frequently than the elbow in the context of pediatric joint injuries. * **Shoulder:** MO can occur in the deltoid or pectoralis major, but it is rare compared to the elbow. * **Hip:** Heterotopic ossification is common around the hip following total hip arthroplasty or central nervous system trauma, but it is not the primary site for post-traumatic MO in children. **Clinical Pearls for NEET-PG:** * **Golden Rule of Management:** Never massage a recently injured joint (especially the elbow), as it is the leading provocative factor for MO. * **Radiological Sign:** On X-ray, it shows a characteristic **"zonal phenomenon"** (mature lamellar bone at the periphery and immature fibroblastic tissue in the center). This distinguishes it from osteosarcoma, which has a more mature center. * **Treatment:** Rest and immobilization in the acute phase. Surgery (excision) is only indicated after the bone matures (usually 6–12 months), signaled by a cold bone scan and well-defined margins on X-ray.

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Open Fractures

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Fractures in Children

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Fracture Complications

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Nonunion and Malunion

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Trauma — MCQs

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