Trauma Practice Questions

Q: Recurrent dislocations are common in which joint?

Shoulder. **Explanation:** The **Shoulder (Glenohumeral) joint** is the most common joint in the body to undergo recurrent dislocation. This is primarily due to its unique anatomy: it is a "ball-and-socket" joint characterized by a large humeral head articulating with a small, shallow glenoid cavity (often compared to a golf ball on a tee). While this allows for an extraordinary range of motion, it inherently sacrifices stability. Recurrence is frequently driven by the failure of soft tissue stabilizers to heal, specifically the **Bankart lesion** (avulsion of the anterior-inferior labrum) and the **Hill-Sachs lesion** (compression fracture of the posterolateral humeral head). Age is the most significant predictor of recurrence; the younger the patient at the time of the first dislocation, the higher the risk of recurrence. **Analysis of Incorrect Options:** * **Patella:** While patellar dislocations can be recurrent (often due to trochlear dysplasia or ligamentous laxity), they are statistically less common than shoulder recurrences in the general population. * **Hip Joint:** The hip is a highly stable, deep socket joint with strong ligamentous support. Dislocation usually requires high-energy trauma (e.g., dashboard injuries), and recurrence is rare unless there is significant bony destruction. * **Elbow Joint:** The elbow is the second most common joint to dislocate in adults, but it possesses high bony stability. Once reduced, it rarely becomes recurrent unless there is an associated fracture (e.g., "Terrible Triad"). **High-Yield Clinical Pearls for NEET-PG:** * **Most common direction:** Anterior (95%), specifically the subcoracoid type. * **Nerve at risk:** Axillary nerve (tested by sensation over the "regimental badge" area). * **Key Radiographic View:** Axillary view or Stryker notch view (for Hill-Sachs). * **Gold Standard Surgery:** Arthroscopic Bankart repair.

Q: Following a fracture of the humerus, which of the following is responsible for producing the majority of the new bone that will reunite the two fragments?

Periosteum. **Explanation:** The healing of a fracture occurs through a complex physiological process involving the formation of a callus. The **Periosteum** (Option D) is the primary contributor to this process. It consists of two layers: an outer fibrous layer and an inner **osteogenic (cambium) layer**. Following a fracture, the osteoprogenitor cells in the cambium layer are activated, proliferating and differentiating into osteoblasts. These cells produce the "external callus," which bridges the fracture gap and provides the majority of the new bone required for clinical union. **Analysis of Incorrect Options:** * **Cancellous bone (A):** While cancellous bone has a high surface area and osteogenic potential, its contribution is primarily to the "internal callus." It is less significant than the periosteum in the initial bridging of a long bone fracture like the humerus. * **Cartilage (B):** Cartilage is a temporary intermediate tissue formed during endochondral ossification (soft callus stage). It acts as a template but does not "produce" the bone; it is eventually replaced by bone. * **Compact bone (C):** Cortical or compact bone is dense and has a limited blood supply. It contributes the least to rapid callus formation and heals very slowly through direct Haversian remodeling. **NEET-PG High-Yield Pearls:** * **Primary Bone Healing:** Occurs via "contact healing" or "gap healing" only when there is absolute stability (e.g., internal fixation with plates). No callus is formed. * **Secondary Bone Healing:** The most common type (e.g., in casts or intramedullary nails). It involves five stages: Hematoma → Inflammation → Soft Callus → Hard Callus → Remodeling. * **Cambium Layer:** This is the most important layer of the periosteum for fracture healing and is more active in children, explaining their faster healing rates.

Q: In a condylar fracture, the anatomy of the joint is disturbed but the function remains normal. What is this type of joint known as?

Metarthrosis. ### Explanation **1. Why Metarthrosis is Correct:** The term **Metarthrosis** refers to a clinical condition where the anatomical integrity of a joint is disrupted (usually due to a fracture, such as a condylar fracture), yet the joint continues to function surprisingly well. In these cases, despite the malalignment or intra-articular damage seen on imaging, the patient retains a functional range of motion and stability. This "paradoxical" preservation of function in a structurally damaged joint is the hallmark of metarthrosis. **2. Analysis of Incorrect Options:** * **Dysarthrosis (Option A):** This is a general term for any joint deformity or impairment. It refers to a joint that is malfunctioning or painful due to disease or injury, which contradicts the "normal function" described in the question. * **Pseudoarthrosis (Option C):** Also known as a "false joint," this occurs when a fracture fails to unite (non-union). The body forms a fibrous or synovial-lined space between the bone ends, allowing abnormal movement at a site where there should be solid bone. Unlike metarthrosis, pseudoarthrosis is a pathological failure of healing and usually results in instability or pain. * **None (Option D):** Incorrect, as Metarthrosis specifically defines the scenario provided. **3. Clinical Pearls for NEET-PG:** * **Condylar Fractures:** Often managed conservatively if the occlusion is stable, precisely because the joint can achieve "metarthrosis"—functional adaptation despite anatomical change. * **Anatomical vs. Functional Reduction:** While most intra-articular fractures require perfect anatomical reduction to prevent secondary osteoarthritis, certain joints (like the temporomandibular joint or specific humeral condyle fractures in children) are noted for their functional adaptability. * **Key Distinction:** Remember, **Pseudoarthrosis = Non-union** (pathological), while **Metarthrosis = Functional adaptation** (compensatory).

Q: In an open injury during toileting and debridement, what indicates muscle viability?

Muscle contractility. In the management of open fractures, assessing muscle viability is critical during surgical debridement to prevent infection and gas gangrene. The standard clinical assessment follows the **"4 Cs" rule**. ### Why "Muscle Contractility" is the Correct Answer While all 4 Cs are used, **contractility** (the muscle’s ability to contract when stimulated by a forceps or diathermy) is considered the **most reliable and objective clinical indicator** of muscle viability. A muscle that contracts has an intact motor end-plate and sufficient physiological reserve, suggesting it can recover. ### Explanation of Incorrect Options * **A. Colour:** While healthy muscle is typically beefy red, colour is the **least reliable** indicator. Muscle may appear bruised or pale due to local trauma or surface oxidation but still be viable. * **C. Punctate bleeding:** Bleeding indicates intact microcirculation. While a very strong sign of viability, it can sometimes be misleading if there is passive venous congestion or if the patient is hypotensive. * **D. Muscle function:** This refers to the patient’s ability to actively move the limb. In an acute trauma setting, muscle function cannot be assessed due to pain, nerve injury, or the use of anesthesia/muscle relaxants during surgery. ### Clinical Pearls for NEET-PG: The "4 Cs" of Muscle Viability When performing debridement, surgeons evaluate these four criteria (ranked from most to least reliable): 1. **Contractility:** Response to stimulus (Most reliable). 2. **Capillary Bleeding:** Punctate bleeding when cut. 3. **Consistency:** Viable muscle is firm and resilient; dead muscle is friable/mushy. 4. **Colour:** Red vs. dark/dusky (Least reliable). **High-Yield Note:** If a muscle fails the contractility test, it is generally considered non-viable and should be excised to reduce the risk of *Clostridial* infections.

Q: Which of the following is NOT a component of the management of fat embolism syndrome?

Streptokinase therapy. **Explanation:** Fat Embolism Syndrome (FES) is a clinical diagnosis characterized by the triad of respiratory distress, neurological symptoms, and petechial rashes, typically occurring 24–72 hours after long bone fractures. **Why Streptokinase is the Correct Answer (NOT used):** Streptokinase is a thrombolytic agent used to dissolve blood clots (fibrin) in conditions like myocardial infarction or pulmonary thromboembolism. FES is caused by **fat globules** and the subsequent inflammatory response (free fatty acids), not by fibrin-based thrombi. Therefore, thrombolytics have no role and may increase the risk of bleeding in trauma patients. **Analysis of Other Options:** * **Oxygen Therapy:** This is the **most important** aspect of management. Maintaining arterial oxygenation (often requiring mechanical ventilation) is the mainstay of treatment as FES is self-limiting if the patient is supported through the respiratory crisis. * **Heparin Administration:** Historically used to clear lipemia by stimulating lipoprotein lipase. While its routine use is now controversial due to bleeding risks, it remains a documented (though secondary) pharmacological consideration in some protocols. * **Corticosteroids:** High-dose corticosteroids (e.g., Methylprednisolone) are used to reduce the inflammatory pulmonary edema and stabilize capillary membranes, although their prophylactic use is more evidence-based than therapeutic use. **High-Yield Clinical Pearls for NEET-PG:** * **Gurd’s Criteria:** Used for diagnosis (Major: Petechial rash, Respiratory insufficiency, CNS depression). * **Snowstorm Appearance:** Classic finding on Chest X-ray. * **Earliest Sign:** Tachycardia. * **Most Pathognomonic Sign:** Petechial rash (found in the conjunctiva, axilla, and neck). * **Prevention:** Early stabilization and internal fixation of long bone fractures is the best way to prevent FES.

Q: What does the return of the bulbocavernous reflex indicate in the context of spinal shock?

Sign of recovery from spinal shock. **Explanation:** **1. Why Option A is correct:** Spinal shock is a state of transient physiological reflex depression below the level of a spinal cord injury. It is characterized by flaccid paralysis, loss of sensations, and **absent reflexes** (including autonomic reflexes). The **Bulbocavernous Reflex (BCR)**—elicited by squeezing the glans penis or tugging on a Foley catheter while feeling for anal sphincter contraction—is typically the first reflex to return as spinal shock resolves. Therefore, the presence of BCR signifies the **end of spinal shock**, allowing for a more accurate assessment of the true extent of the neurological injury. **2. Why other options are incorrect:** * **Option B:** A pial lesion refers to the superficial layer of the spinal cord and is not a clinical term used to describe the resolution of spinal shock. * **Options C & D:** The return of BCR does **not** differentiate between complete or incomplete transection. It merely indicates that the spinal cord distal to the injury is physiologically active again. If BCR returns but there is no motor or sensory function below the level of injury, it is a **Complete** injury. If some function returns along with BCR, it is an **Incomplete** injury. **Clinical Pearls for NEET-PG:** * **Definition of Spinal Shock:** A physiological shutdown, not an anatomical one. * **Sequence of Recovery:** BCR is the first reflex to return (usually within 24–48 hours). * **Prognostic Rule:** You cannot definitively label a spinal cord injury as "Complete" until the spinal shock has resolved (i.e., until the BCR has returned). * **Neurogenic Shock vs. Spinal Shock:** Do not confuse the two. Neurogenic shock is a **hemodynamic** phenomenon (hypotension + bradycardia) due to loss of sympathetic tone, whereas spinal shock is a **neurological** phenomenon (loss of reflexes).

Question 1

Recurrent dislocations are common in which joint?

Accepted Answer

Shoulder

Answer

Patella

Answer

Hip joint

Answer

Elbow joint

Question 2

Following a fracture of the humerus, which of the following is responsible for producing the majority of the new bone that will reunite the two fragments?

Accepted Answer

Periosteum

Answer

Cancellous bone

Answer

Cartilage

Answer

Compact bone

Question 3

A compound fracture is initially treated by antibiotics and wound toilet. What is the next appropriate step in management?

Accepted Answer

External splintage

Answer

Skin cover

Answer

Prosthesis

Answer

Internal fixation

Question 4

In a condylar fracture, the anatomy of the joint is disturbed but the function remains normal. What is this type of joint known as?

Accepted Answer

Metarthrosis

Answer

Dysarthrosis

Answer

Pseudoarthrosis

Answer

None

Question 5

A 44-year-old woman suffers a right tibial plateau fracture after a motor vehicle accident. She is neurovascularly intact with soft compartments and has no other significant injuries apart from a minor concussion and several broken ribs. Which of the following, if present, is an indication for operative fixation?

Accepted Answer

Articular step-off of 5 mm

Answer

ACL tear on follow-up MRI

Answer

Condylar widening less than 3 mm

Answer

Lateral meniscal tear on follow-up MRI

Question 6

In an open injury during toileting and debridement, what indicates muscle viability?

Accepted Answer

Muscle contractility

Answer

Colour of the muscle

Answer

Punctate bleeding spots on the cut edge

Answer

Muscle function

Question 7

Which of the following is NOT a component of the management of fat embolism syndrome?

Accepted Answer

Streptokinase therapy

Answer

Oxygen therapy

Answer

Heparin administration

Answer

Corticosteroid use

Question 8

A patient with nephrotic syndrome on long-term steroid therapy for 6 years presents with a limp gait and limitation of hip abduction and internal rotation. What is the most probable diagnosis?

Accepted Answer

Avascular necrosis of the hip

Answer

Renal osteodystrophy

Answer

Septic arthritis

Answer

Osteomyelitis of the hip joint

Question 9

A 30-year-old male presented to the ER with an abnormal position of the right upper limb. The range of motion was reduced at the right shoulder, and the patient was in severe pain. On examination, the arm was in an abducted and externally rotated position. Neurovascular examination was normal. Which of the following X-rays most likely corresponds with the above condition?

Accepted Answer

X-ray showing shoulder dislocation with the humeral head anteriorly displaced and externally rotated.

Answer

X-ray showing shoulder dislocation with the humeral head posteriorly displaced and internally rotated.

Answer

X-ray showing a typical shoulder fracture.

Answer

All of the above

Question 10

What does the return of the bulbocavernous reflex indicate in the context of spinal shock?

Accepted Answer

Sign of recovery from spinal shock

Answer

Pial lesion of the spinal cord

Answer

Complete transection of the spinal cord

Answer

Incomplete transection of the spinal cord

Trauma — MCQs

Trauma — MCQs

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