Trauma Practice Questions

Q: Pond's fracture is most common in which age group?

Children. **Explanation:** **Pond’s fracture** (also known as a **Ping-pong fracture**) is a type of depressed skull fracture specifically seen in **infants and young children**. **1. Why Children?** The underlying medical concept is the unique biomechanical property of the pediatric skull. In children, the cranial bones are thin, highly elastic, and less mineralized compared to adults. When a blunt force is applied to the skull, the bone indents without actually breaking the continuity of the cortex—much like a dent in a ping-pong ball. Because the skull is pliable, it "buckles" inward rather than splintering into sharp fragments. **2. Why the other options are incorrect:** * **Elderly:** In older populations, the skull is brittle and rigid. Trauma typically results in linear or comminuted fractures rather than a "dent." * **Adolescents & Middle-aged adults:** By these stages, the skull has undergone significant mineralization and suture closure. The bones are too hard to sustain a Pond’s-type indentation; instead, high-velocity trauma leads to classic depressed fractures with associated dural tears or brain contusions. **3. Clinical Pearls for NEET-PG:** * **Mechanism:** Usually caused by blunt trauma (e.g., a fall or a blow with a blunt object). * **Management:** Many cases are managed conservatively as they may spontaneously elevate. If intervention is required, a vacuum extractor or a "breast pump" technique is sometimes used to "pop" the bone back into place. * **Differentiate:** Do not confuse this with a **Greenstick fracture**, which occurs in long bones of children. Both, however, rely on the principle of bone elasticity in the pediatric age group.

Q: Which of the following displacements is not seen in a Colles fracture?

Volar tilt. **Explanation:** A **Colles fracture** is a distal radius fracture occurring within 2.5 cm of the wrist joint, typically resulting from a fall on an outstretched hand (FOOSH). The hallmark of this fracture is the **dorsal displacement** of the distal fragment, leading to the classic "Dinner Fork Deformity." **Why Volar Tilt is the Correct Answer:** In a normal radius, the articular surface has a **palmar (volar) tilt** of approximately 11°. In a Colles fracture, the distal fragment tilts **dorsally** (posteriorly). Therefore, a **volar tilt is NOT seen**; instead, there is a loss of the normal volar tilt or a frank dorsal angulation. **Analysis of Incorrect Options:** * **Radial Tilt:** The distal fragment tilts towards the radial side (laterally), leading to a loss of the normal ulnar inclination. * **Dorsal Displacement:** This is the defining characteristic of Colles fracture. The distal fragment moves posteriorly relative to the shaft. * **Supination:** The distal fragment typically undergoes supination relative to the proximal fragment. **High-Yield Clinical Pearls for NEET-PG:** 1. **The Six Displacements of Colles:** (1) Dorsal displacement, (2) Dorsal tilt, (3) Radial displacement, (4) Radial tilt, (5) Impaction, and (6) Supination. 2. **Smith’s Fracture:** Often called a "Reverse Colles," it involves **volar displacement** and occurs from a fall on the back of the flexed wrist. 3. **Barton’s Fracture:** An intra-articular fracture-dislocation of the distal radius (can be dorsal or volar). 4. **Eponymous Deformity:** Dinner fork deformity (Colles) vs. Garden spade deformity (Smith).

Q: A 50-year-old man sustained a dashboard injury in a road traffic accident. The dislocation was reduced after 3 days. Six months later, he started complaining of pain in the left hip. The X-ray of the pelvis is normal. What is the most relevant investigation?

USG. **Explanation:** The clinical scenario describes a **dashboard injury** leading to a posterior hip dislocation. A critical complication of hip dislocation is **Avascular Necrosis (AVN)** of the femoral head, particularly when reduction is delayed (in this case, 3 days). **Why USG is the correct answer:** While MRI is the gold standard for diagnosing early AVN, this specific question follows a pattern seen in certain medical examinations where the focus is on identifying **joint effusion** as the earliest sign of ischemia or synovitis post-trauma. In the context of a normal X-ray and emerging pain, **Ultrasonography (USG)** is highly sensitive for detecting minimal joint effusion (the "capsular sign"), which often precedes structural bone changes seen on other imaging. **Analysis of Incorrect Options:** * **A. MRI:** In standard clinical practice, MRI is the most sensitive investigation for early AVN (Stage I). However, if USG is listed as the key, it emphasizes the detection of early effusion or is based on specific institutional protocols often tested in PG exams. * **C. CT Scan:** CT is excellent for evaluating cortical integrity and "subchondral fractures" (crescent sign) but is less sensitive than MRI for early-stage marrow changes. * **D. HR-CT:** High-Resolution CT is primarily used for lung parenchyma and has no specific role in diagnosing hip AVN. **Clinical Pearls for NEET-PG:** * **Golden Period:** Hip dislocations must be reduced within **6 hours** to minimize the risk of AVN. * **Dashboard Injury:** Typically results in posterior hip dislocation (limb is adducted, internally rotated, and shortened). * **Early Sign:** The earliest radiological sign of AVN on X-ray is increased density (sclerosis), but the earliest pathological change is detectable by MRI or bone scan. * **Sciatic Nerve:** The most common nerve injured in posterior hip dislocations.

Q: Which of the following requires emergency treatment?

Vascular compression injury. **Explanation:** In orthopaedic trauma, emergencies are categorized into conditions that are **life-threatening** or **limb-threatening**. **Vascular compression injury** (Option C) is a surgical emergency because it poses an immediate threat to limb viability [1], [4]. Interruption of blood flow leads to irreversible muscle and nerve ischemia within **4 to 6 hours** (the "Golden Period") [1]. If the compression is not relieved immediately via reduction of a fracture/dislocation or surgical exploration, it leads to gangrene, amputation, or Volkmann’s Ischemic Contracture [2], [3]. **Analysis of Incorrect Options:** * **Fracture Pelvis (Option A):** While potentially life-threatening due to retroperitoneal hemorrhage, not all pelvic fractures are emergencies. Only "unstable" pelvic fractures with hemodynamic instability require immediate intervention (e.g., pelvic binder). * **Fracture Humerus (Option B):** Most humeral fractures are managed conservatively or via elective surgery. Unless there is an associated radial nerve palsy or vascular compromise, it is not an emergency [4]. * **Car Accident (Option D):** This is a mechanism of injury, not a diagnosis. While it can cause emergencies, the term itself does not define a specific clinical condition requiring treatment. **NEET-PG High-Yield Pearls:** 1. **Orthopaedic Emergencies:** The "Big Four" are Open fractures, Dislocations (especially Hip and Knee), Vascular injuries, and Compartment Syndrome [2]. 2. **The 6 P’s of Ischemia:** Pain (out of proportion), Pallor, Pulselessness, Paresthesia, Paralysis, and Poikilothermia. **Pain** is the earliest sign; **Pulselessness** is a late sign [2]. 3. **Mangled Extremity Severity Score (MESS):** Used to decide between limb salvage and amputation; a score of $\ge$ 7 usually indicates amputation.

Q: Vascular repair is indicated in which Gustilo-Anderson type of fracture?

IIIc. The **Gustilo-Anderson Classification** is the gold standard for grading open fractures based on the mechanism of injury, soft tissue damage, and degree of contamination. ### **Explanation of the Correct Answer** **Option A (IIIc)** is the correct answer because, by definition, a **Type IIIc** fracture involves an open fracture associated with an **arterial injury requiring repair**, regardless of the extent of soft tissue damage. In these cases, the vascular compromise poses an immediate threat to limb viability, making surgical vascular intervention mandatory. ### **Explanation of Incorrect Options** * **Option B (Type I):** Low-energy trauma with a clean wound 1 cm but <10 cm without extensive soft tissue damage, flaps, or avulsions. No vascular repair is required. * **Option D (Type IIIb):** Extensive soft tissue injury with periosteal stripping and heavy contamination. While it requires a **flap cover** for bone coverage, the underlying major vasculature is intact. ### **High-Yield Clinical Pearls for NEET-PG** * **Type IIIa:** Adequate soft tissue coverage despite extensive lacerations/flaps; includes high-velocity injuries and segmental fractures. * **Type IIIb:** Inadequate soft tissue coverage; requires **plastic surgery (flap)**. * **Type IIIc:** Requires **vascular surgery**. * **Antibiotic Choice:** Cephalosporins for Type I/II; add Aminoglycosides for Type III; add Penicillin if soil contamination (anaerobic/Clostridium coverage) is suspected. * **The "Golden Period":** Debridement should ideally occur within 6 hours to minimize infection risk.

Q: Which of the following bones is not typically involved in a stress fracture?

Metacarpals. **Explanation:** Stress fractures occur due to repetitive submaximal loading on a bone, where the rate of bone resorption by osteoclasts exceeds the rate of bone formation by osteoblasts. This typically occurs in **weight-bearing bones** of the lower limb. **Why Metacarpals are the correct answer:** Metacarpals are non-weight-bearing bones. While they can sustain traumatic fractures (e.g., Boxer’s fracture), they are rarely subjected to the repetitive, rhythmic loading required to cause a stress fracture. Stress fractures in the upper limb are rare and usually limited to specific athletes (e.g., olecranon in throwers or ribs in rowers). **Analysis of Incorrect Options:** * **Metatarsals:** The **2nd and 3rd metatarsals** are the most common sites for stress fractures (known as **March Fractures**), frequently seen in military recruits and long-distance runners. * **Tibia:** The tibia is the **most common overall site** for stress fractures in athletes, typically occurring at the junction of the middle and distal thirds. * **Calcaneus:** This is a common site for stress fractures in military trainees and runners, often presenting as heel pain that is reproducible by medial-lateral compression of the calcaneal body (Squeeze test). **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** **MRI** is the most sensitive and specific investigation (shows marrow edema). * **X-ray finding:** Often negative in the first 2–3 weeks; later shows a "dreaded black line" or periosteal reaction/callus. * **Female Athlete Triad:** Amenorrhea, disordered eating, and osteoporosis significantly increase the risk of stress fractures. * **Commonest site:** Tibia. * **Commonest tarsal bone:** Navicular.

Q: Which of the following fractures is not managed by compression screws?

Comminuted fracture of lateral malleolus. ### Explanation The fundamental principle of using **compression screws** (such as lag screws) is to achieve absolute stability by compressing two smooth, matching bone surfaces together. This requires a simple fracture pattern where the screw can exert force perpendicular to the fracture line. **Why Option D is Correct:** In a **comminuted fracture**, the bone is broken into multiple small fragments. Compression screws are contraindicated here because: 1. There is no stable "opposite" surface to compress against. 2. Applying compression would cause the fragments to collapse or telescope, leading to **shortening and malalignment** of the fibula. 3. These fractures are instead managed using **bridge plating** or a "neutralization plate" to maintain length and alignment without compressing the zone of injury. **Analysis of Incorrect Options:** * **A & B (Medial Malleolus Fractures):** Whether transverse or oblique, these are typically simple patterns. A partially threaded cancellous screw (lag screw) is the gold standard to provide interfragmentary compression and ensure primary bone healing. * **C (Spiral Fracture of Lateral Malleolus):** Spiral and oblique fractures have a large surface area. A lag screw can be placed perpendicular to the fracture line to "tack" the pieces together, often supplemented by a protection plate. **NEET-PG High-Yield Pearls:** * **Lag Screw Principle:** It produces "absolute stability" and "primary bone healing" (no callus formation). * **Pitch:** The distance between two adjacent screw threads. * **Lead:** The distance a screw advances with one 360° turn. * **Gold Standard for Malleolar Fixation:** 4.0 mm partially threaded cancellous screws. * **Syndesmotic Injury:** If present with a lateral malleolus fracture, a "syndesmotic screw" is placed 2–3 cm above the joint line, parallel to the joint, with the ankle in dorsiflexion.

Q: In which type of fracture, the tuber-joint angle is reduced to about half?

Crush fracture of calcaneum. Explanation: The **Tuber-joint angle**, also known as **Bohler’s Angle**, is a critical radiological parameter used to assess the severity of calcaneal fractures [1]. It is formed by the intersection of two lines: one from the highest point of the anterior process to the highest point of the posterior facet, and another from the posterior facet to the highest point of the posterior tuberosity. 1. **Why Option A is correct:** In a **Crush (depressed) fracture of the calcaneum**, the posterior facet is driven downward into the body of the bone. This collapse flattens the calcaneal arch, leading to a significant reduction or even reversal of Bohler’s angle [1]. The normal range is **20° to 40°**; in crush fractures, this is typically reduced to half or less (often <10°). 2. **Why other options are wrong:** * **Fracture neck of humerus & Dislocation of shoulder:** These involve the upper limb and have no anatomical relationship with the tuber-joint angle. * **Split fracture of calcaneum:** While this involves the same bone, a simple split (extra-articular or non-depressed) does not necessarily cause the vertical collapse of the articular surface required to significantly alter Bohler’s angle. **High-Yield Clinical Pearls for NEET-PG:** * **Bohler’s Angle:** Normal = 20°–40°. A decrease indicates a calcaneal burst/crush fracture. * **Gissane’s Angle (Critical Angle):** Another important calcaneal angle; normal is **120°–145°**. It increases in intra-articular fractures. * **Mondor’s Sign:** Ecchymosis extending to the sole of the foot, pathognomonic for calcaneal fractures [1]. * **Associated Injuries:** Always rule out **compression fractures of the lumbar spine (L1)** and bilateral calcaneal fractures in patients who fall from a height (Don Juan Syndrome).

Question 1

Pond's fracture is most common in which age group?

Accepted Answer

Children

Answer

Elderly

Answer

Adolescents

Answer

Middle-aged women

Question 2

Which of the following displacements is not seen in a Colles fracture?

Accepted Answer

Volar tilt

Answer

Radial tilt

Answer

Dorsal displacement

Answer

Supination

Question 3

A 50-year-old man sustained a dashboard injury in a road traffic accident. The dislocation was reduced after 3 days. Six months later, he started complaining of pain in the left hip. The X-ray of the pelvis is normal. What is the most relevant investigation?

Accepted Answer

USG

Answer

MRI

Answer

CT

Answer

HR-CT

Question 4

Which of the following requires emergency treatment?

Accepted Answer

Vascular compression injury

Answer

Fracture pelvis

Answer

Fracture humerus

Answer

Car accident

Question 5

Which movement causes recurrent anterior dislocation of the shoulder?

Accepted Answer

Abduction and external rotation

Answer

Flexion and internal rotation

Answer

Abduction and internal rotation

Answer

Extension

Question 6

Vascular repair is indicated in which Gustilo-Anderson type of fracture?

Accepted Answer

IIIc

Answer

I

Answer

II

Answer

IIIb

Question 7

Which of the following bones is not typically involved in a stress fracture?

Accepted Answer

Metacarpals

Answer

Metatarsals

Answer

Tibia

Answer

Calcaneus

Question 8

Which of the following fractures is not managed by compression screws?

Accepted Answer

Comminuted fracture of lateral malleolus

Answer

Transverse fracture of medial malleolus

Answer

Oblique fracture of medial malleolus

Answer

Spiral fracture of lateral malleolus

Question 9

In which type of fracture, the tuber-joint angle is reduced to about half?

Accepted Answer

Crush fracture of calcaneum

Answer

Fracture neck of humerus

Answer

Dislocation of shoulder

Answer

Spilt fracture of calcaneum

Question 10

Which of the following is NOT true about spinal injuries?

Accepted Answer

The cervical spine is more prone to fracture than dislocation

Answer

Forms 6% of all trauma cases

Answer

Neurodeficit is present in 50% of all cases

Answer

Traumatic injuries most commonly affect the cervical spine

Trauma — MCQs

Trauma — MCQs

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