Trauma — MCQs

Trauma Indian Medical PG Practice Questions and MCQs

Question 771: What is the most common type of supracondylar fracture?

A. Neutral
B. Flexion
C. Extension (Correct Answer)
D. Lateral

Explanation: ### Explanation **1. Why Extension is Correct:** Supracondylar fractures of the humerus are the most common pediatric elbow fractures. The **Extension type** is the most frequent, accounting for approximately **95-98%** of all cases. It occurs due to a fall on an outstretched hand (FOOSH) with the elbow in hyperextension. In this mechanism, the olecranon is forced into the olecranon fossa, acting as a fulcrum that causes the distal fragment to displace **posteriorly**. **2. Why Other Options are Incorrect:** * **Flexion (Option B):** This accounts for only **2-5%** of cases. It occurs due to a direct blow to the posterior aspect of the flexed elbow, causing the distal fragment to displace **anteriorly**. * **Neutral (Option A):** This is not a standard classification for supracondylar fractures. Fractures are classified based on the direction of displacement of the distal fragment relative to the proximal shaft. * **Lateral (Option D):** While lateral condyle fractures exist, "Lateral" is not a type of supracondylar fracture; it is a separate anatomical entity (and the second most common elbow fracture in children). **3. Clinical Pearls for NEET-PG:** * **Gartland Classification:** Used for Extension-type fractures (Type I: Undisplaced; Type II: Displaced with intact posterior cortex; Type III: Completely displaced). * **Most Common Nerve Injured:** * Extension type: **Anterior Interosseous Nerve (AIN)**, a branch of the Median nerve (Check for "OK sign"). * Flexion type: **Ulnar Nerve**. * **Most Common Vascular Injury:** Brachial Artery. * **Complications:** * Early: Volkmann’s Ischemic Contracture (VIC). * Late: **Cubitus Varus** (Gunstock deformity) due to malunion (most common). * **Radiology:** Look for the "Fat pad sign" (Sail sign) and the "Anterior Humeral Line" (which should normally bisect the middle third of the capitellum).

Question 772: A 40-year-old female patient on long-term steroid therapy presents with recent onset of severe pain in the right hip. What is the imaging modality of choice for this problem?

A. CT scan
B. Bone scan
C. MRI (Correct Answer)
D. Plain X-ray

Explanation: **Explanation:** The clinical presentation of a patient on long-term steroid therapy with sudden onset hip pain is highly suspicious for **Avascular Necrosis (AVN) of the femoral head**. Steroids are a well-known risk factor for non-traumatic osteonecrosis. **Why MRI is the Correct Answer:** MRI is the **most sensitive (99%) and specific** imaging modality for the early diagnosis of AVN. It can detect changes in the bone marrow (edema and signal changes) even before any structural changes occur in the bone. It is the gold standard for diagnosing **Stage I AVN** (Ficat and Arlet classification), where X-rays appear completely normal. **Why other options are incorrect:** * **Plain X-ray:** While usually the first investigation performed, it is insensitive in early stages. It only shows changes (like the "Crescent sign" or sclerosis) in advanced stages (Stage II and beyond). * **CT Scan:** CT is excellent for evaluating the extent of subchondral collapse or cortical involvement, but it is less sensitive than MRI for early marrow changes. * **Bone Scan:** Technetium-99m bone scans can show a "cold spot" (early) or "hot spot" (late), but they lack the specificity and anatomical detail provided by MRI. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site for AVN:** Femoral head. * **Earliest sign on MRI:** Low-intensity T1 signal (Band-like pattern). * **Double Line Sign:** A pathognomonic MRI finding in AVN (high-intensity inner line and low-intensity outer line on T2-weighted images). * **Crescent Sign:** Seen on X-ray; indicates subchondral fracture (Stage III). * **Treatment:** Core decompression is the treatment of choice for early stages (pre-collapse). Total Hip Arthroplasty (THA) is indicated for late stages (post-collapse).

Question 773: What is the treatment of choice for a non-united fracture of the shaft of the femur in an elderly patient?

A. Compression plating
B. Bone grafting
C. Nailing
D. Compression plating with bone grafting (Correct Answer)

Explanation: **Explanation:** The management of a non-union in the femoral shaft requires addressing two fundamental requirements for bone healing: **mechanical stability** and **biological stimulation**. 1. **Why Option D is correct:** In an elderly patient, bone healing capacity is often diminished due to poor vascularity or osteoporosis. **Compression plating** (using a Dynamic Compression Plate) provides rigid internal fixation and compression at the fracture site, which eliminates motion. However, since it is a non-union, stability alone is often insufficient. **Bone grafting** (typically autologous cancellous graft) provides the necessary osteoconductive and osteoinductive properties to jump-start the biological healing process. The combination ensures both the "scaffold" and the "stability" needed for union. 2. **Why other options are incorrect:** * **Compression plating (A):** Provides stability but lacks the biological stimulus required to overcome an established non-union. * **Bone grafting (B):** Provides biology but lacks the mechanical stability required to hold the femur (a weight-bearing bone) in alignment. * **Nailing (C):** While intramedullary nailing is the gold standard for *fresh* femoral fractures, in the case of non-union (especially atrophic), nailing alone has a higher failure rate compared to the direct compression and grafting achieved via plating. **Clinical Pearls for NEET-PG:** * **Definition of Non-union:** A fracture that has no chance of healing without surgical intervention (typically after 6–9 months). * **Atrophic Non-union:** Characterized by "pencil-tip" bone ends and lack of callus; always requires bone grafting. * **Hypertrophic Non-union:** Characterized by "elephant foot" appearance; usually requires stability (plating/nailing) alone as biology is already active. * **Gold Standard Graft:** Autologous Iliac Crest Bone Graft (AICBG).

Question 774: Which nerve injury has the best prognosis?

A. Radial nerve (Correct Answer)
B. Ulnar nerve
C. Median nerve
D. Axillary nerve

Explanation: The prognosis of a peripheral nerve injury depends on the nerve's fiber composition, the distance to the target muscle, and the complexity of the motor tasks it performs. **Explanation of the Correct Answer:** The **Radial nerve** has the best prognosis among all major peripheral nerves of the upper limb. This is primarily because it is predominantly a **motor nerve** with a high proportion of large, myelinated fibers. Its target muscles (extensors of the wrist and fingers) are located relatively close to the sites of common injury (e.g., humeral shaft fractures), allowing for faster reinnervation. Furthermore, the radial nerve supplies muscles involved in "gross" movements rather than intricate, fine motor skills, making functional recovery more achievable even if reinnervation is not anatomically perfect. **Analysis of Incorrect Options:** * **Ulnar Nerve:** Has the **worst prognosis**. It supplies the intrinsic muscles of the hand responsible for fine motor control. These muscles are far from the site of injury (long distance for axonal regrowth) and are highly sensitive to denervation atrophy. * **Median Nerve:** Prognosis is intermediate. While it supplies important sensory areas and the thenar eminence, the requirement for precise sensory feedback and fine thumb opposition makes its recovery more complex than the radial nerve. * **Axillary Nerve:** While it has a short course, it is less frequently cited as having the "best" prognosis compared to the radial nerve in standardized exams, as radial nerve recovery is more clinically consistent across various injury levels. **High-Yield NEET-PG Pearls:** * **Order of recovery (Best to Worst):** Radial > Median > Ulnar. * **Rate of nerve regeneration:** Approximately **1 mm/day** (or 1 inch per month). * **Sunderland Classification:** Grade I (Neuropraxia) has the best prognosis for spontaneous recovery, while Grade V (Neurotmesis) requires surgical intervention. * **Clinical Sign:** Radial nerve injury typically presents as **Wrist Drop**.

Question 775: In a fracture of the shaft of the humerus, which of the following complications requires immediate surgery?

A. Compound fracture
B. Nerve injury
C. Arterial occlusion (Correct Answer)
D. Comminuted fracture

Explanation: **Explanation:** In the management of humeral shaft fractures, **Arterial Occlusion (Option C)** is a surgical emergency. The brachial artery is the primary vessel at risk, especially in fractures of the distal third of the humerus. If blood flow is compromised, the limb faces an immediate risk of ischemia and subsequent **Volkmann’s Ischemic Contracture**. Therefore, immediate surgical exploration, vascular repair, and stabilization of the fracture are mandatory to restore perfusion. **Analysis of Other Options:** * **A. Compound Fracture:** While these require urgent debridement and stabilization (usually within 6–24 hours), they do not always necessitate "immediate" surgery in the same life-or-limb-threatening sense as a complete arterial block, provided the wound is cleaned and antibiotics are started. * **B. Nerve Injury:** The **Radial Nerve** is the most commonly injured nerve in humeral shaft fractures (especially Holstein-Lewis fractures). However, most are neuropraxias that resolve spontaneously. Surgery is only indicated if the nerve injury occurs *after* manipulation or in open injuries. * **C. Comminuted Fracture:** These are usually managed conservatively with a U-slab or functional bracing (Sarmiento brace). Surgery is only required if alignment cannot be maintained. **NEET-PG High-Yield Pearls:** * **Most common nerve injured:** Radial nerve (specifically in the spiral groove). * **Holstein-Lewis Fracture:** A spiral fracture of the distal 1/3rd of the humerus associated with radial nerve palsy. * **Primary treatment:** Most humeral shaft fractures (up to 90%) are managed **conservatively** with a hanging cast or functional brace. * **Absolute indications for surgery:** Vascular injury, "floating elbow" (simultaneous forearm fracture), and bilateral humeral fractures.

Question 776: Which of the following is tarsometatarsal amputation?

A. Sarmiento's Amputation
B. Lisfranc's Amputation (Correct Answer)
C. Chopart's Amputation
D. Syme's Amputation

Explanation: **Explanation:** The correct answer is **Lisfranc’s Amputation**. This procedure involves disarticulation at the **tarsometatarsal joint**, which serves as the anatomical boundary between the midfoot and the forefoot. ### Why Lisfranc’s is Correct: Lisfranc’s amputation involves the separation of the five metatarsals from the cuneiforms and the cuboid. A significant clinical concern with this level of amputation is the development of an **equinovarus deformity**. This occurs because the insertion of the tibialis anterior and peroneus brevis is often lost or weakened, leading to the unopposed action of the gastrocnemius-soleus complex (Achilles tendon). ### Analysis of Incorrect Options: * **Sarmiento’s:** This is not an amputation but a specific type of **functional patellar tendon-bearing (PTB) cast/brace** used for the non-operative management of tibial fractures. * **Chopart’s Amputation:** This is a **mid-tarsal disarticulation** occurring at the talonavicular and calcaneocuboid joints. It preserves only the talus and calcaneus. Like Lisfranc’s, it is highly prone to equinus deformity. * **Syme’s Amputation:** This is a **disarticulation of the ankle joint**. It involves removing the entire foot and the malleoli, with the heel pad being preserved and migrated distally to allow for end-weight bearing. ### High-Yield Clinical Pearls for NEET-PG: * **Boyd’s Amputation:** A horizontal transection of the calcaneus with talocalcaneal arthrodesis (preserves the heel pad). * **Pirogoff’s Amputation:** Similar to Boyd’s, but the calcaneus is transected vertically and rotated 90 degrees. * **Most common complication** of midfoot amputations (Lisfranc/Chopart) is **Equinus deformity** due to muscle imbalance. * **Syme’s** is considered the most functional lower-limb amputation because it allows for direct end-weight bearing.

Question 777: Clay Shoveler's fracture involves which part of the vertebra?

A. Spinous process (Correct Answer)
B. Lamina
C. Pedicle
D. Body

Explanation: **Explanation:** **Clay Shoveler’s fracture** is a stable, isolated stress fracture of the **spinous process**. It most commonly involves the **C7** vertebra, followed by C6 and T1. **Why the Spinous Process is the Correct Answer:** The fracture occurs due to sudden, forceful contraction of the trapezius and rhomboid muscles or sudden flexion of the neck. Historically, this was seen in laborers (clay shovelers) who tossed heavy loads of soil over their shoulders. The powerful pull of the muscles against the supraspinous ligaments results in an avulsion fracture of the spinous process. **Why Other Options are Incorrect:** * **Lamina & Pedicle:** These structures form the vertebral arch. Fractures here are usually associated with high-energy trauma (like burst fractures or Hangman’s fracture) and often involve neurological compromise or instability, unlike the stable Clay Shoveler’s fracture. * **Body:** Fractures of the vertebral body (e.g., Wedge or Compression fractures) are typically caused by axial loading or severe flexion, not muscle avulsion. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Avulsion injury (Flexion-type). * **Most Common Site:** **C7** (the most prominent spinous process). * **Stability:** It is a **stable** fracture; the spinal cord is not at risk. * **Radiology:** On a lateral X-ray, it appears as a downward-displaced fragment of the spinous process (the **"Ghost Sign"** may be seen on AP view where the fractured process appears double). * **Management:** Conservative treatment with analgesics and a soft cervical collar.

Question 778: Gallows traction is used for which of the following?

A. Fracture of the shaft of the tibia in children
B. Fracture of the shaft of the femur in children (Correct Answer)
C. Fracture of the shaft of the tibia in adults
D. Fracture of the shaft of the femur in adults

Explanation: **Explanation:** **Gallows Traction** (also known as Bryant’s traction) is a specific type of skin traction used primarily for the treatment of **fracture of the shaft of the femur in children**. **Why the correct answer is right:** The underlying medical concept involves using the child's own body weight as counter-traction. In this method, both legs are suspended vertically using skin traction attached to an overhead longitudinal beam. The traction is applied such that the **buttocks are just lifted off the bed** (roughly 1–2 cm). This position ensures that the weight of the lower trunk provides the necessary counter-traction to align the femoral fragments. It is indicated specifically for children **under 2 years of age** or those weighing **less than 12–15 kg**. **Why the incorrect options are wrong:** * **Options A & C (Tibia fractures):** Tibial shaft fractures in both children and adults are typically managed with closed reduction and casting (Above-knee or Below-knee casts) or intramedullary nailing in adults, not vertical suspension traction. * **Option D (Femur fracture in adults):** Adults have significantly higher muscle mass and body weight. Gallows traction would be ineffective for providing enough force to overcome muscle spasm and would cause severe neurovascular compromise. Adults require skeletal traction (e.g., Thomas splint) or surgical fixation (Intramedullary nailing). **High-Yield Clinical Pearls for NEET-PG:** * **Age/Weight Limit:** Most effective in children <2 years and <15 kg. * **Complication:** The most serious complication is **vascular compromise** (ischemia) of the feet. Frequent checks of distal pulses and capillary refill are mandatory. * **Position:** Both legs are suspended even if only one is fractured to maintain stability and prevent rotation. * **Alternative:** For children older than 2 years, a Thomas splint or Hamilton-Russell traction is preferred.

Question 779: Medial epicondyle fracture results in injury to which nerve?

A. Radial nerve
B. Median nerve
C. Ulnar nerve (Correct Answer)
D. Axillary nerve

Explanation: **Explanation:** The **ulnar nerve** is the correct answer because of its specific anatomical relationship with the medial epicondyle of the humerus. It passes through the **cubital tunnel**, located directly posterior to the medial epicondyle. In fractures of this bony prominence, the nerve can be injured either by direct trauma, stretching (valgus stress), or entrapment within the fracture site. **Analysis of Options:** * **Ulnar Nerve (Correct):** It is the most commonly injured nerve in medial epicondyle fractures. This injury often presents with "claw hand" deformity and sensory loss over the medial one and a half fingers. * **Radial Nerve (Incorrect):** This nerve is most commonly injured in **mid-shaft humerus fractures** (radial groove) or **Holstein-Lewis fractures**. In the elbow region, it is associated with lateral epicondyle injuries or Supracondylar fractures (Type II/III). * **Median Nerve (Incorrect):** This nerve is typically injured in **Supracondylar fractures of the humerus** (specifically the posterolateral displacement type). * **Axillary Nerve (Incorrect):** This nerve is associated with **proximal humerus fractures** (surgical neck) or anterior dislocations of the shoulder joint. **High-Yield Clinical Pearls for NEET-PG:** * **Tardy Ulnar Palsy:** A late complication of **Lateral Condyle fractures** (due to cubitus valgus deformity), not medial epicondyle fractures. * **Medial Epicondyle:** It is the last ossification center to fuse around the elbow (Ages: 5-7 years). * **Common Flexor Origin:** The medial epicondyle serves as the origin for the forearm flexors; avulsion fractures are common in young athletes (e.g., "Little League Elbow").

Question 780: In fracture neck of femur, in which stage are all the trabeculae of the pelvis and femur in alignment?

A. Stage I
B. Stage II (Correct Answer)
C. Stage III
D. Stage IV

Explanation: ### Explanation This question refers to the **Garden Classification** of femoral neck fractures, which is based on the degree of displacement and the alignment of the **medial compressive trabeculae** on an AP radiograph. **Why Stage II is correct:** In **Garden Stage II**, the fracture is **complete but non-displaced**. Because there is no angulation or shifting of the bone fragments, the trabecular patterns of the femoral head remain in perfect alignment with the trabeculae of the acetabulum and the femoral shaft. It is the only "complete" fracture where the normal anatomical vectors are preserved. **Analysis of Incorrect Options:** * **Stage I (Incomplete/Impacted):** This is an incomplete or abducted (valgus) impacted fracture. The trabeculae of the head are angled relative to the neck (valgus deformity), meaning they are **not** in normal alignment. * **Stage III (Complete, Partially Displaced):** The fracture is complete with partial displacement. The distal fragment rotates externally, causing the trabeculae of the head to be out of line with those of the neck/pelvis. * **Stage IV (Complete, Fully Displaced):** The head fragment is completely detached from the neck. Interestingly, the head may realign itself within the acetabulum (appearing "normal"), but the fracture itself is totally displaced from the shaft, meaning the overall alignment of the femur and pelvis is lost. **High-Yield Clinical Pearls for NEET-PG:** * **Garden Classification** is the most widely used system for prognosis; Stages I and II are "Stable," while III and IV are "Unstable." * **Vascularity:** The risk of **Avascular Necrosis (AVN)** increases significantly from Stage I to IV due to the disruption of the retinacular vessels (branches of the medial circumflex femoral artery). * **Management Rule of Thumb:** * Stages I & II: Internal fixation (e.g., Cannulated Cancellous Screws). * Stages III & IV (Elderly): Arthroplasty (Hemi or Total Hip) due to the high risk of non-union and AVN. * **Pauwels Classification:** Another high-yield system based on the **angle of the fracture line**; higher angles (vertical) indicate greater shear forces and instability.

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Spinal Trauma

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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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