This practice set contains high-yield board review questions covering key concepts in 2. Trauma. Each clinical scenario is designed to test your diagnostic and management skills relevant to this subspecialty.
Question 2781
Topic: 2. Trauma
The Sanders classification for calcaneal fractures is based on the number and location of articular fracture lines through the posterior facet. On which specific imaging view is this classification system determined?
Correct Answer & Explanation
. Coronal computed tomography (CT) reconstruction
Explanation
The Sanders classification is based on coronal CT images showing the widest aspect of the posterior facet of the calcaneus. It categorizes fractures into four types based on the number of primary fracture lines dividing the facet.
Question 2782
Topic: 2. Trauma
A 28-year-old male long-distance runner presents with a 6-month history of bilateral lower leg pain. The pain is described as a deep, aching tightness in the posteromedial calf, which consistently begins after approximately 15 minutes of running and progressively worsens, forcing him to stop. The pain resolves completely within 10-15 minutes of rest. He denies any numbness or tingling. Physical examination reveals tenderness along the posteromedial tibia, but no palpable mass or crepitus. Dorsiflexion and plantarflexion are full and pain-free at rest. Radiographs are negative for stress fracture. He has tried activity modification, orthotics, and physical therapy without significant improvement. Given this presentation, which of the following is the MOST likely diagnosis?
Correct Answer & Explanation
. Deep Posterior Chronic Exertional Compartment Syndrome (CECS)
Explanation
Correct Answer: CThe patient's symptoms are classic for Chronic Exertional Compartment Syndrome (CECS), specifically involving the deep posterior compartment. The key features are exercise-induced pain and tightness that consistently begin after a specific duration of activity, progressively worsen, and resolve completely with rest. The location of pain (deep posteromedial calf) points to the deep posterior compartment. The failure of conservative management and negative radiographs further support this. While MTSS (A) also presents with exertional pain along the posteromedial tibia, it typically involves periostitis or bone stress and often has a more diffuse, less 'tight' quality, and may not resolve as quickly or completely with rest. A tibial stress fracture (B) would typically cause localized pain that is present at rest or with minimal activity, and would likely be visible on radiographs or bone scan. Popliteal artery entrapment syndrome (D) would present with exertional leg pain, but it is primarily vascular claudication, often described as cramping, and may be associated with diminished pulses post-exercise. Tibialis Posterior tendinopathy (E) would cause pain with specific movements (inversion, plantarflexion) and tenderness directly over the tendon, and while exertional, the 'tightness' and rapid resolution with rest are more indicative of CECS.
Question 2783
Topic: 2. Trauma
A 22-year-old collegiate soccer player presents with exertional deep posterior leg pain. Intracompartmental pressure measurements are performed during a treadmill test that reproduces his symptoms. Which of the following pressure profiles, measured in mmHg, would be diagnostic for deep posterior chronic exertional compartment syndrome (CECS) requiring surgical consideration?
Correct Answer: BThe case outlines the standardized diagnostic criteria for CECS, which include: Resting pressure > 15 mmHg, 1-minute post-exercise pressure > 30 mmHg, and 5-minute post-exercise pressure > 20 mmHg. Option B (Resting: 18, 1-minute post-exercise: 35, 5-minutes post-exercise: 25) is the only option that meets all three of these criteria. Option A fails the 1-minute post-exercise criterion. Option C fails all three criteria. Option D fails the 1-minute post-exercise criterion. Option E fails the 5-minute post-exercise criterion. It is crucial that these measurements reproduce the patient's symptoms during the exercise provocation.
Question 2784
Topic: 2. Trauma
A 32-year-old military recruit has been diagnosed with deep posterior chronic exertional compartment syndrome (CECS) based on classic symptoms and positive intracompartmental pressure measurements. He has undergone 6 months of dedicated conservative therapy, including activity modification, physical therapy, and orthotics, but continues to experience debilitating pain that prevents him from performing his duties. Which of the following is the strongest indication for proceeding with surgical fasciotomy?
Correct Answer & Explanation
. Failure of non-operative management for at least 3-6 months with persistent, debilitating symptoms.
Explanation
Correct Answer: CThe strongest indication for operative intervention for deep posterior CECS is the failure of non-operative management for a minimum of 3-6 months, coupled with persistent and debilitating exertional deep posterior leg pain. While patient desire (A) is important, it's not the primary medical indication. A resting pressure of 16 mmHg (B) alone is not sufficient; the dynamic post-exercise pressures are more critical for diagnosis, and the overall picture of failed conservative care is paramount for surgical indication. MRI findings of muscle edema (D) are non-specific and not diagnostic for CECS. Exclusion of other pathologies like stress fracture (E) is a necessary step in the diagnostic workup, but it is not an indication for surgery itself; rather, it confirms the diagnosis of CECS by ruling out alternatives.
Question 2785
Topic: 2. Trauma
During a medial deep posterior fasciotomy, the surgeon has made the skin incision and carefully retracted the great saphenous vein and saphenous nerve. The medial gastrocnemius and soleus muscles have been retracted posteriorly and laterally. The image below shows the next critical anatomical layer encountered. Which structure, indicated by the arrow, is the primary target for surgical release in this procedure?
Correct Answer & Explanation
. Deep transverse crural fascia
Explanation
Correct Answer: CThe image depicts a surgical view after retracting the soleus muscle. The arrow points to the glistening, dense fascial layer that encapsulates the deep posterior compartment muscles. This is the deep transverse crural fascia, which is the primary target for release in a deep posterior fasciotomy. The case explicitly states: 'After retracting the soleus muscle, the surgeon will visualize a glistening, dense fascial layer. This is the deep transverse crural fascia, which encloses the deep posterior compartment. This is the primary target for release.' The tibial nerve (A) and posterior tibial artery (B) lie immediately superficial to this fascia and must be carefully identified and protected, not incised. The Flexor Digitorum Longus muscle (D) is one of the muscleswithinthe compartment, which will bulge once the fascia is released. The interosseous membrane (E) forms the anterior boundary of the deep posterior compartment and is not the structure being incised from this medial approach.
Question 2786
Topic: 2. Trauma
During a medial deep posterior fasciotomy for chronic exertional compartment syndrome, meticulous dissection is crucial to protect vital neurovascular structures. Which of the following statements accurately describes the anatomical relationship of the tibial nerve and posterior tibial vessels relative to the deep transverse crural fascia?
Correct Answer & Explanation
. They lie superficial to the deep transverse crural fascia, nestled between it and the soleus muscle.
Explanation
Correct Answer: CThe case explicitly states: 'Crucially, the tibial nerve and posterior tibial artery and veins lie immediately superficial to this deep transverse fascia, nestled between the soleus and the deep compartment muscles.' This anatomical relationship is critical for safe surgical technique, as the surgeon must identify and protect these structures before incising the deep transverse fascia. Options A and B are incorrect as the neurovascular bundle is not deep to or embedded within the fascia to be incised. Option D is incorrect as these structures are associated with the deep posterior compartment, not the superficial posterior compartment anterior to the gastrocnemius. Option E is incorrect as they are not located in the lateral compartment.
Question 2787
Topic: 2. Trauma
A 25-year-old female undergoes an uncomplicated medial deep posterior fasciotomy for chronic exertional compartment syndrome. During her 6-week post-operative follow-up, she expresses concern about a visible bulge along the posteromedial aspect of her calf, which is soft and non-tender. She has no pain or neurological symptoms. Based on the case information, what is the most appropriate management for this finding?
Correct Answer & Explanation
. Reassurance that this is a common, often asymptomatic, consequence of fasciotomy.
Explanation
Correct Answer: CThe case lists muscle herniation as a common complication of fasciotomy, stating: 'Often unavoidable as a consequence of fascial release. Usually asymptomatic and requires no specific treatment. May cause cosmetic concern; rarely requires fascial repair (with risk of recurrence) or mesh repair for significant symptoms.' Given that the patient is asymptomatic and has no pain or neurological symptoms, reassurance is the most appropriate management. Immediate surgical repair (A) is generally not indicated for asymptomatic herniation due to the risk of recurrence and potential for re-creating compartment syndrome. MRI (B) is unnecessary if the patient is asymptomatic and there are no signs of recurrence. A compression brace (D) might be used for cosmetic concerns but is not a primary medical management for an asymptomatic herniation. Aggressive scar massage (E) is for scar management, not for reducing muscle herniation.
Question 2788
Topic: 2. Trauma
A 29-year-old professional dancer is 12 weeks post-medial deep posterior fasciotomy and is progressing well through rehabilitation. She is eager to return to full dance activities, which involve high-impact movements and agility. According to the advanced rehabilitation protocols, which of the following is a key criterion for her safe return to sport?
Correct Answer & Explanation
. Ability to perform sport-specific drills without symptoms and achieve pre-injury strength symmetry.
Explanation
Correct Answer: CThe 'Phase 4 Advanced Rehabilitation & Return to Sport (Weeks 12+)' section outlines the criteria for return to sport: 'Full pain-free ROM and strength symmetry (isokinetic testing if available). Ability to perform sport-specific drills without symptoms. Achieve pre-injury fitness levels. Psychological readiness.' Therefore, the ability to perform sport-specific drills without symptoms and achieving pre-injury strength symmetry are key criteria. Completion of 12 weeks (A) is a timeline, not a functional criterion. Absence of pain during light walking (B) is a much earlier milestone. A negative repeat intracompartmental pressure test (D) is not a standard criterion for return to sport post-fasciotomy. Subjective feeling of readiness with mild residual tightness (E) is insufficient and could lead to re-injury or recurrence.
Question 2789
Topic: 2. Trauma
A 40-year-old recreational runner is considering treatment options for objectively diagnosed deep posterior chronic exertional compartment syndrome. He asks about the likelihood of success with conservative management. Based on the summary of key literature, what is the typical success rate for conservative management in patients with symptomatic, objectively diagnosed CECS?
Correct Answer & Explanation
. Low, often quoted in the range of 10-30%
Explanation
Correct Answer: CThe 'Summary of Key Literature / Guidelines' section explicitly states: 'Literature consistently supports an initial trial of conservative management for CECS... However, the success rate for conservative management ofsymptomatic, objectively diagnosed CECS(especially with pressures meeting surgical criteria) is generally low, often quoted in the range of 10-30%.' This highlights why surgical intervention is frequently necessary for definitive relief in these patients. Options A, B, and E represent high success rates, which are typically associated with surgical outcomes, not conservative management for objectively diagnosed CECS. Option D is incorrect as the literature provides a clear consensus on the low efficacy of conservative management for objectively diagnosed CECS.
Question 2790
Topic: 2. Trauma
A 24-year-old female runner complains of severe right leg pain after 20 minutes of running. Intracompartmental pressures are measured. Which of the following values is diagnostic for chronic exertional compartment syndrome (CECS) according to the Pedowitz criteria?
Correct Answer & Explanation
. 5-minute post-exercise pressure of 22 mm Hg
Explanation
According to the Pedowitz criteria, CECS is diagnosed if one of the following is met: resting pressure ≥ 15 mm Hg, 1-minute post-exercise ≥ 30 mm Hg, or 5-minute post-exercise ≥ 20 mm Hg. A 5-minute post-exercise pressure of 22 mm Hg meets these criteria.
Question 2791
Topic: 2. Trauma
A 28-year-old marathon runner undergoes isolated anterior compartment fasciotomy for chronic exertional compartment syndrome. Postoperatively, he complains of new-onset numbness in the first dorsal web space of his foot and weakness in great toe extension. Which nerve was most likely injured during the procedure?
Correct Answer & Explanation
. Deep peroneal nerve
Explanation
The deep peroneal nerve courses through the anterior compartment of the leg, providing motor innervation to the anterior musculature and sensation to the first dorsal web space. Iatrogenic injury during anterior fasciotomy can lead to these specific deficits.
Question 2792
Topic: 2. Trauma
According to the modified Pedowitz criteria, which of the following intracompartmental pressure measurements is diagnostic for chronic exertional compartment syndrome (CECS)?
Correct Answer & Explanation
. 5-minute post-exercise pressure ≥ 20 mm Hg
Explanation
The Pedowitz criteria for diagnosing CECS include a resting pressure ≥ 15 mm Hg, a 1-minute post-exercise pressure ≥ 30 mm Hg, or a 5-minute post-exercise pressure ≥ 20 mm Hg. Meeting any one of these thresholds is considered diagnostic.
Question 2793
Topic: 2. Trauma
A 24-year-old collegiate runner is diagnosed with isolated anterior chronic exertional compartment syndrome. Before considering surgical fasciotomy, the patient is advised to alter her running biomechanics. Which of the following gait modifications is MOST likely to decrease the intracompartmental pressure in her anterior compartment?
Correct Answer & Explanation
. Transitioning from a heel strike to a forefoot strike
Explanation
Transitioning from a heel strike to a forefoot strike pattern has been shown to significantly reduce anterior compartment pressures during running. However, this modification may concurrently increase pressures within the deep posterior compartment.
Question 2794
Topic: 2. Trauma
A 28-year-old military recruit undergoes an isolated lateral compartment fasciotomy for chronic exertional compartment syndrome. Postoperatively, he complains of numbness over the dorsum of his foot but has intact sensation in the first web space. Which nerve was most likely injured, and where does it typically pierce the deep fascia to become superficial?
Correct Answer & Explanation
. Superficial peroneal nerve; 10-12 cm proximal to the lateral malleolus
Explanation
The superficial peroneal nerve is at significant risk during lateral compartment fasciotomies. It typically pierces the deep fascia to exit the lateral compartment and become subcutaneous approximately 10 to 12 cm proximal to the lateral malleolus.
Question 2795
Topic: 2. Trauma
When performing an open fasciotomy for deep posterior chronic exertional compartment syndrome via a medial approach, the incision is typically placed 1-2 cm posterior to the posteromedial border of the tibia. Which structure must be identified and protected during this approach?
Correct Answer & Explanation
. Saphenous vein and nerve
Explanation
The medial approach for releasing the deep and superficial posterior compartments places the saphenous nerve and the greater saphenous vein at risk. These structures run superficially along the medial aspect of the leg and must be protected.
Question 2796
Topic: 2. Trauma
A 30-year-old marathon runner undergoes measurement of compartment pressures for suspected chronic exertional compartment syndrome. The catheter is inserted 3 cm lateral to the tibial crest in the proximal third of the leg. Which of the following muscles is located within the compartment being tested?
Correct Answer & Explanation
. Extensor hallucis longus
Explanation
The anterior compartment is located lateral to the tibial crest and contains the tibialis anterior, extensor hallucis longus (EHL), extensor digitorum longus (EDL), and peroneus tertius. The deep peroneal nerve and anterior tibial artery are also within this compartment.
Question 2797
Topic: 2. Trauma
A 24-year-old female runner complains of severe aching in her anterior legs after running 2 miles. Symptoms resolve 30 minutes after cessation of activity. Pre- and post-exercise intracompartmental pressures are measured. According to the Pedowitz criteria, which of the following resting (pre-exercise) pressure measurements is considered diagnostic for chronic exertional compartment syndrome (CECS)?
Correct Answer & Explanation
. Greater than 20 mm Hg
Explanation
According to the Pedowitz criteria for CECS, diagnostic pressures include a resting pressure ≥ 15 mm Hg, a 1-minute post-exercise pressure ≥ 30 mm Hg, or a 5-minute post-exercise pressure ≥ 20 mm Hg. Meeting any one of these criteria in the setting of appropriate clinical symptoms is diagnostic.
Question 2798
Topic: 2. Trauma
A 28-year-old male is undergoing an open fasciotomy for lateral chronic exertional compartment syndrome. During the approach, the surgeon must be careful to avoid a nerve that typically exits the crural fascia in the distal third of the leg. This nerve provides sensory innervation to which of the following areas?
Correct Answer & Explanation
. Dorsum of the foot excluding the first web space
Explanation
The superficial peroneal nerve exits the deep fascia approximately 10-12 cm proximal to the lateral malleolus. It provides sensory innervation to the dorsum of the foot, except for the first web space (deep peroneal nerve) and lateral border (sural nerve).
Question 2799
Topic: 2. Trauma
Which of the following muscle combinations correctly identifies the contents of the deep posterior compartment of the leg, which is often implicated in medial tibial stress syndrome and chronic exertional compartment syndrome?
The deep posterior compartment contains the tibialis posterior, flexor digitorum longus (FDL), and flexor hallucis longus (FHL) muscles. It is commonly involved in patients presenting with medial lower leg pain related to exercise.
Question 2800
Topic: 2. Trauma
A 24-year-old long-distance runner presents with bilateral exertional leg pain. Dynamic intracompartmental pressures are measured to evaluate for chronic exertional compartment syndrome (CECS). According to the Pedowitz criteria, which of the following isolated pressure measurements is considered diagnostic for CECS?
Correct Answer & Explanation
. 5-minute post-exercise pressure of 22 mmHg
Explanation
The Pedowitz criteria for diagnosing CECS require at least one of the following: resting pressure ≥ 15 mmHg, 1-minute post-exercise pressure ≥ 30 mmHg, or 5-minute post-exercise pressure ≥ 20 mmHg.
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