Trauma Practice Questions

Q: Which line joins the greater trochanter and the anterior superior iliac spine?

Schoemaker's line. **Explanation:** The correct answer is **Schoemaker’s line**. This clinical line is used to assess the position of the greater trochanter in relation to the pelvis, which is vital for diagnosing hip pathologies. **1. Why Schoemaker’s Line is Correct:** Schoemaker’s line is an imaginary line drawn from the tip of the **greater trochanter** through the **Anterior Superior Iliac Spine (ASIS)** and extended toward the midline of the abdomen. * **Normal:** The line passes **above the umbilicus**. * **Abnormal:** If the greater trochanter is displaced proximally (e.g., in femoral neck fractures, developmental dysplasia of the hip, or Perthes disease), the line passes **below the umbilicus**. **2. Analysis of Incorrect Options:** * **Perkin’s Line:** A vertical line drawn downward from the lateral edge of the acetabular roof on a pelvic X-ray. It is used to diagnose Congenital Dislocation of the Hip (CDH); the femoral head should normally lie medial to this line. * **Nélaton’s Line:** A line connecting the **ASIS to the Ischial Tuberosity**. In a normal hip, the greater trochanter lies on or below this line. If the trochanter is felt above this line, it indicates upward hip dislocation or a neck fracture. * **Chiene’s Line:** A line joining the two ASIS and another joining the two greater trochanters. Normally, these lines are parallel. Non-parallelism suggests pelvic tilt or trochanteric displacement. **Clinical Pearls for NEET-PG:** * **Bryant’s Triangle:** Used to measure the upward displacement of the trochanter. The horizontal base of the triangle shortens in hip fractures. * **Trendelenburg Test:** Assesses the stability of the hip and the strength of the abductors (Gluteus medius and minimus). * **Shenton’s Line:** An anatomical curve on X-ray formed by the inferior margin of the femoral neck and the superior margin of the obturator foramen. Interruption indicates hip pathology.

Q: A 40-year-old man was admitted with fracture of the shaft of the femur following a road traffic accident. On the 2nd day, he became disoriented, was found to be tachypnoeic, and had conjunctival petechiae. What is the most likely diagnosis?

Fat embolism. ### Explanation The clinical presentation described is a classic triad of **Fat Embolism Syndrome (FES)**, which typically occurs 24–72 hours after a long bone fracture (most commonly the femur). **Why Fat Embolism is the Correct Answer:** Fat embolism occurs when fat globules from the bone marrow enter the systemic circulation following a fracture. The diagnosis is primarily clinical, based on **Gurd’s Criteria**. This patient exhibits the classic triad: 1. **Respiratory Distress:** Tachypnoea and hypoxia. 2. **Neurological Changes:** Disorientation/confusion (due to cerebral microemboli). 3. **Petechial Rash:** Characteristically found in the conjunctiva, axilla, and neck (pathognomonic but present in only 20-50% of cases). **Why Other Options are Incorrect:** * **Pulmonary Embolism (PE):** While it causes tachypnoea, it usually occurs later (1–2 weeks post-injury) due to DVT. It does not present with petechiae. * **Sepsis Syndrome:** Usually presents with fever, hypotension, and a clear source of infection. The 48-hour window and petechiae are more specific to FES. * **Haemothorax:** This would present immediately after trauma with decreased breath sounds and dullness on percussion, not after a 2-day "latent period." **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Fracture of the shaft of the femur. * **Earliest sign:** Hypoxia (PaO2 < 60 mmHg). * **Pathognomonic sign:** Petechial rash. * **Investigation of choice:** Clinical diagnosis; however, "Snowstorm appearance" may be seen on Chest X-ray. * **Treatment:** Primarily supportive (Oxygenation/Ventilation). Early splintage and fixation of the fracture are the best preventive measures.

Q: What is a late complication of acetabular fracture?

Osteoarthritis. **Explanation:** **1. Why Osteoarthritis is the correct answer:** Acetabular fractures are intra-articular injuries involving the weight-bearing surface of the hip joint. Even with anatomical reduction, the initial trauma often causes chondrocyte death or subchondral bone irregularities. This leads to **Post-Traumatic Osteoarthritis (OA)**, which is the most common late complication. The risk increases significantly if there is residual joint incongruity, femoral head contour changes, or avascular necrosis. **2. Analysis of Incorrect Options:** * **Tardy sciatic nerve palsy:** While sciatic nerve injury is a common complication of acetabular fractures (especially posterior wall fractures), it is typically an **early/acute** complication occurring at the time of injury or during surgery. "Tardy" (late-onset) palsy is characteristic of the ulnar nerve at the elbow, not the sciatic nerve. * **Recurrent dislocation:** This is a common complication of **traumatic hip dislocations** (especially if the labrum or capsule is poorly healed), but it is not a standard late complication of an isolated acetabular fracture unless there is significant posterior wall deficiency that was left unaddressed. **3. NEET-PG High-Yield Pearls:** * **Most common early complication:** Sciatic nerve palsy (specifically the peroneal division). * **Most common late complication:** Post-traumatic Osteoarthritis. * **Heterotopic Ossification:** Another important late complication, often seen following the Kocher-Langenbeck surgical approach. * **Avascular Necrosis (AVN):** Can occur in the femoral head due to associated hip dislocation or disruption of the medial circumflex femoral artery. * **Radiological Sign:** The "Gull-sign" on an obturator oblique view indicates a specific type of comminuted superior acetabular roof fracture.

Q: Milkman's Fracture is a type of?

Pseudofracture. **Explanation:** **Milkman’s Fracture** is a classic example of a **Pseudofracture** (also known as **Looser’s zones** or Umbauzonen). These are not true traumatic fractures but are radiolucent lines representing stress fractures that have healed with unmineralized osteoid. 1. **Why Pseudofracture is correct:** In metabolic bone diseases like **Osteomalacia** (adults) or **Rickets** (children), there is defective mineralization of the bone matrix. Under physiological stress, small cortical cracks occur. Because the body cannot properly mineralize the repair tissue, these areas appear as thin, transverse lucent bands on X-rays, often symmetrical and perpendicular to the bone cortex. Common sites include the axillary border of the scapula, inner cortex of the femoral neck, ribs, and pubic rami. 2. **Why other options are incorrect:** * **Clavicular, Humeral, and Metacarpal fractures** typically refer to acute traumatic injuries or specific eponymous fractures (e.g., Smith’s, Colles’, or Boxer’s fracture). While these bones *can* develop pseudofractures, Milkman's syndrome specifically describes the clinical entity of multiple pseudofractures associated with osteomalacia. **High-Yield Clinical Pearls for NEET-PG:** * **Pathognomonic for:** Osteomalacia. * **Radiological appearance:** Transverse lucent lines with sclerotic margins, often bilateral and symmetrical. * **Common Sites:** Scapula (most common), ribs, pubic rami, and medial cortex of the femur. * **Biochemical markers:** Low Vitamin D, low Serum Calcium/Phosphate, and **Elevated Alkaline Phosphatase (ALP)**.

Q: What is the treatment of choice for a 65-year-old male with a fracture of the neck of the femur sustained 6 weeks ago?

Hemiarthroplasty. ### Explanation The treatment of choice for a fracture of the neck of the femur depends primarily on the **age of the patient** and the **duration since the injury**. **Why Hemiarthroplasty is Correct:** In an elderly patient (65 years old) with a "neglected" or old fracture (6 weeks duration), the risk of **Avascular Necrosis (AVN)** and **Non-union** is extremely high due to the precarious retrograde blood supply of the femoral head. At 6 weeks, the fracture site is unlikely to heal with internal fixation. Therefore, replacing the femoral head (Hemiarthroplasty) is the standard of care. It allows for immediate weight-bearing and avoids the complications of a second surgery if fixation fails. **Analysis of Incorrect Options:** * **A. SP (Smith-Petersen) Nailing:** This is an obsolete method of internal fixation. Even modern fixation (like Cannulated Cancellous Screws) is generally avoided in elderly patients with old fractures because the biological potential for healing is lost after 3 weeks. * **B. McMurray’s Osteotomy:** This is a displacement osteotomy used historically to convert shearing forces into compressive forces to promote healing in non-union. However, it is rarely performed today and is not the first choice in an elderly patient who requires early mobilization. **High-Yield Clinical Pearls for NEET-PG:** 1. **The "3-Week" Rule:** Neck of femur fractures are considered "neglected" if they are >3 weeks old. 2. **Age-Based Management:** * ** 60 years:** Replacement (Hemiarthroplasty if sedentary; Total Hip Arthroplasty if active/pre-existing arthritis). 3. **Garden Classification:** Used to grade displacement; Garden III and IV have the highest risk of AVN. 4. **Pauwels Classification:** Based on the angle of the fracture line; higher angles indicate greater instability.

Q: The anterior drawer test is used to assess which structure?

Anterior Cruciate Ligament (ACL). **Explanation:** The **Anterior Drawer Test** is a clinical examination used to evaluate the integrity of the **Anterior Cruciate Ligament (ACL)**. The ACL's primary function is to prevent the anterior translation of the tibia relative to the femur. During the test, the patient lies supine with the knee flexed to 90°. The examiner stabilizes the foot and pulls the proximal tibia forward. A "positive" test is indicated by excessive anterior displacement (usually >5mm) compared to the unaffected side, signifying an ACL tear. **Analysis of Options:** * **Option A (Correct):** The test specifically stresses the ACL by mimicking the force that the ligament is designed to resist. * **Option B (Incorrect):** The **Posterior Drawer Test** is used for the PCL. In this test, the tibia is pushed posteriorly; excessive backward displacement indicates a PCL injury. * **Options C & D (Incorrect):** Meniscal injuries are assessed using tests that involve joint line tenderness and rotation under compression, such as **McMurray’s Test**, **Apley’s Grind Test**, or the **Thessaly Test**. **High-Yield Clinical Pearls for NEET-PG:** * **Lachman Test:** This is the **most sensitive** clinical test for acute ACL tears. It is performed at 20–30° of flexion, which reduces the stabilizing effect of the hamstrings. * **Pivot Shift Test:** This is the **most specific** test for ACL deficiency, indicating functional instability. * **Segond Fracture:** A small avulsion fracture of the lateral tibial condyle; it is pathognomonic for an ACL tear. * **Unhappy Triad (O'Donoghue):** Consists of injuries to the ACL, Medial Collateral Ligament (MCL), and Medial Meniscus (though recent studies suggest the Lateral Meniscus is more commonly involved in acute settings).

Question 1

The fracture of the tooth-bearing segment of the mandible is classified as which type?

Accepted Answer

Compound

Answer

Simple

Answer

Complex

Answer

Comminuted

Question 2

A 7-year-old boy with a history of trauma 2 months ago now presents with fever and acute pain over the thigh. X-ray of the femoral shaft shows lesions with multiple laminated periosteal reactions. What is the next line of management?

Accepted Answer

MRI

Answer

CRP measurement

Answer

Core biopsy

Answer

Tc99 MDP scan

Question 3

Which line joins the greater trochanter and the anterior superior iliac spine?

Accepted Answer

Schoemaker's line

Answer

Perkin's line

Answer

Nelton's line

Answer

Chiene's line

Question 4

A 40-year-old man was admitted with fracture of the shaft of the femur following a road traffic accident. On the 2nd day, he became disoriented, was found to be tachypnoeic, and had conjunctival petechiae. What is the most likely diagnosis?

Accepted Answer

Fat embolism

Answer

Pulmonary embolism

Answer

Sepsis syndrome

Answer

Haemothorax

Question 5

What is the first muscle to be involved in Volkmann's ischemic contracture of the forearm?

Accepted Answer

Flexor digitorum profundus

Answer

Flexor digitorum superficialis

Answer

Flexor Carpi Radialis

Answer

Extensor carpi radialis brevis

Question 6

What is a late complication of acetabular fracture?

Accepted Answer

Osteoarthritis

Answer

Tardy sciatic nerve palsy

Answer

Recurrent dislocation

Answer

None of the above

Question 7

Milkman's Fracture is a type of?

Accepted Answer

Pseudofracture

Answer

Clavicular fracture

Answer

Humeral fracture

Answer

Metacarpal fracture

Question 8

Prosthetic replacement of the femoral head is usually indicated for which of the following?

Accepted Answer

Untreated femoral neck fracture in a patient over 65 years

Answer

Fresh intracapsular fracture of the head of the femur in elderly patients

Answer

Fresh intracapsular fracture of the femoral neck in a young adult

Answer

Unreduced posterior dislocation of the hip

Question 9

What is the treatment of choice for a 65-year-old male with a fracture of the neck of the femur sustained 6 weeks ago?

Accepted Answer

Hemiarthroplasty

Answer

SP nailing

Answer

Mc Murray's osteotomy

Answer

None of the above

Question 10

The anterior drawer test is used to assess which structure?

Accepted Answer

Anterior Cruciate Ligament (ACL)

Answer

Posterior Cruciate Ligament (PCL)

Answer

Medial meniscus

Answer

Lateral meniscus

Trauma — MCQs

Trauma — MCQs

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