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ABPTS SCS study materials
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ABPTS SCS practice questions

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Question 1Injury Prevention and Risk Reduction

Which intrinsic risk factor most strongly predisposes a female athlete to non-contact anterior cruciate ligament injury?

  1. Wearing low-cut cleats on natural grass
  2. Landing with increased dynamic knee valgus Correct answer.
  3. Using a lace-up ankle brace
  4. Playing on a wet synthetic surface

Explanation

Excessive dynamic knee valgus during landing and cutting increases frontal-plane load on the ACL and is a well-established intrinsic biomechanical risk factor. The other choices are extrinsic equipment or surface factors rather than athlete-intrinsic mechanics.

Question 2Injury Prevention and Risk Reduction

A soccer coach asks how to reduce hamstring strain injuries in the squad. Which program element has the strongest evidence for prevention?

  1. Deep tissue massage after each session
  2. Static stretching held 60 seconds before training
  3. Nordic hamstring eccentric strengthening Correct answer.
  4. Increasing weekly sprint volume rapidly

Explanation

The Nordic hamstring exercise progressively loads the hamstrings eccentrically and has strong evidence for reducing hamstring strain incidence. Static stretching and massage do not confer meaningful protective effect, and rapid sprint load increases raise risk.

Question 3Injury Prevention and Risk Reduction

Which measure best describes the proportion of athletes who develop an injury during a defined period?

  1. Cumulative incidence Correct answer.
  2. Case fatality proportion
  3. Exposure-adjusted rate ratio
  4. Injury severity score

Explanation

Cumulative incidence expresses the proportion of an at-risk population that develops the outcome over a specified period. Severity scores describe harm magnitude, rate ratios compare rates between groups, and case fatality describes death among cases.

Question 4Injury Prevention and Risk Reduction

Which training principle most directly reduces overuse injury risk when athletes increase workload?

  1. Progressing one workload variable at a time with planned recovery Correct answer.
  2. Eliminating all rest days during preseason
  3. Increasing volume and intensity simultaneously each week
  4. Doubling training volume after a vacation

Explanation

Sequential progression of a single workload variable with adequate recovery limits spikes in load that drive overuse injury. Simultaneous increases and abrupt volume jumps create high acute-to-chronic workload ratios.

Question 5Injury Prevention and Risk Reduction

Which extrinsic factor is most consistently associated with increased risk of lower extremity injury in field sport athletes?

  1. Playing surface and shoe-surface interaction Correct answer.
  2. Athlete height
  3. Resting heart rate
  4. Hand dominance

Explanation

Shoe-surface interaction determines traction and is a recognized extrinsic risk factor for lower extremity injury. Height, resting heart rate, and hand dominance are not established extrinsic injury risk factors in this context.

Question 6Injury Prevention and Risk Reduction

What is the primary purpose of a pre-participation physical evaluation in injury prevention?

  1. Identifying conditions that may increase injury or illness risk Correct answer.
  2. Ranking athletes for team selection
  3. Measuring maximal aerobic capacity for training zones
  4. Guaranteeing that no injury will occur during the season

Explanation

The pre-participation evaluation screens for medical and musculoskeletal conditions that could raise risk during sport so that modifications can be made. It cannot guarantee injury-free participation and is not a selection or fitness-testing tool.

Question 7Injury Prevention and Risk Reduction

Which piece of protective equipment has the clearest evidence for reducing the incidence of dental and orofacial injury in contact sport?

  1. Mouthguard Correct answer.
  2. Compression shorts
  3. Wrist tape
  4. Neoprene knee sleeve

Explanation

Mouthguards absorb and distribute impact forces to the teeth and jaw, reducing dental and orofacial injury in contact sports. The other items do not protect the orofacial region.

Question 8Injury Prevention and Risk Reduction

An athlete reports a 40% increase in training volume over two weeks after a long break. What is the most appropriate injury-prevention response?

  1. Ignore it because volume changes do not affect risk
  2. Maintain the new volume to build tolerance quickly
  3. Reduce the load spike and progress more gradually Correct answer.
  4. Add a second daily session to adapt faster

Explanation

A large acute increase after detraining produces a high acute-to-chronic workload ratio, which is associated with increased injury risk. Reducing the spike and progressing gradually allows tissue adaptation while preserving fitness gains.

Question 9Injury Prevention and Risk Reduction

Which neuromuscular warm-up component has the strongest evidence for reducing ACL injury in female athletes?

  1. Plyometric and dynamic stabilization training Correct answer.
  2. Passive hamstring stretching
  3. Static quadriceps stretching alone
  4. Isolated biceps curl strengthening

Explanation

Programs combining plyometrics, dynamic stabilization, and technique feedback reduce ACL injury incidence in female athletes by improving landing and cutting mechanics. Static stretching alone and isolated upper extremity strengthening do not provide this protection.

Question 10Injury Prevention and Risk Reduction

A runner increases weekly mileage by 10% each week for six weeks and develops lateral knee pain. Which workload concept best explains this presentation?

  1. Chronic training load being too low relative to acute load Correct answer.
  2. Weekly training frequency being too stable
  3. Total career training hours being excessive
  4. Acute training load being too low relative to chronic load

Explanation

When acute load rises faster than the chronic load the athlete is prepared for, the acute-to-chronic ratio climbs and overuse injury risk increases. A low chronic base relative to the new acute demand is the key mismatch.

Question 11Injury Prevention and Risk Reduction

Which finding on preseason screening most warrants a targeted injury-prevention program for an overhead athlete?

  1. Symmetrical grip strength
  2. Bilateral equal shoulder external rotation
  3. Limited glenohumeral internal rotation with total arc deficit Correct answer.
  4. Pain-free full cervical range of motion

Explanation

Glenohumeral internal rotation deficit with a total arc deficit alters shoulder mechanics and is associated with shoulder injury in overhead athletes, justifying a targeted program. Symmetrical findings and normal cervical motion do not indicate elevated risk.

Question 12Injury Prevention and Risk Reduction

Which strategy most effectively reduces the risk of exertional heat illness during preseason practice in hot conditions?

  1. Scheduling practice at peak afternoon heat
  2. Gradual heat acclimatization with scheduled rest and hydration Correct answer.
  3. Wearing additional insulating layers to promote sweating
  4. Restricting fluids to prevent stomach cramping

Explanation

Progressive heat acclimatization combined with scheduled rest breaks and fluid access improves thermoregulation and reduces exertional heat illness risk. Peak heat exposure, fluid restriction, and extra insulating clothing all increase risk.

Question 13Injury Prevention and Risk Reduction

Which mechanism best explains why ankle taping and bracing reduce lateral ankle sprain risk?

  1. Reducing muscle protein breakdown
  2. Limiting excessive inversion motion Correct answer.
  3. Improving aerobic endurance
  4. Increasing plantarflexion strength

Explanation

Taping and bracing provide mechanical restraint against excessive inversion, the primary mechanism of lateral ankle sprain. They do not meaningfully increase strength, endurance, or affect protein metabolism.

Question 14Injury Prevention and Risk Reduction

Which program design element is most important for preventing overuse injuries in youth athletes who play a single sport year-round?

  1. Playing multiple teams in the same sport simultaneously
  2. Periodized rest and diversified movement exposure Correct answer.
  3. Eliminating strength training to reduce load
  4. Increasing specialization intensity through the off-season

Explanation

Periodized rest and varied movement exposure reduce repetitive tissue stress and are recommended to counter the risks of early single-sport specialization. Intensifying year-round play or stacking multiple teams increases cumulative load.

Question 15Injury Prevention and Risk Reduction

Which statement best reflects the relationship between previous injury and future injury risk?

  1. Previous injury is among the strongest predictors of subsequent injury Correct answer.
  2. Previous injury has no influence on future risk once symptoms resolve
  3. Previous injury only matters for the same season
  4. Previous injury reduces risk through protective adaptation

Explanation

Prior injury is one of the most consistent risk factors for subsequent injury, largely through residual deficits in strength, proprioception, and neuromuscular control. Risk persists beyond symptom resolution and across seasons.

Question 16Injury Prevention and Risk Reduction

A clinician wants to reduce concussion risk in a contact sport. Which combination is most appropriate?

  1. Mouthguard alone with no technique training
  2. Helmet use alone with no rule enforcement
  3. Neck strengthening alone with no equipment changes
  4. Mouthguard plus helmet use with technique training and rule enforcement Correct answer.

Explanation

Concussion prevention is multifactorial, combining protective equipment, contact technique training, and enforcement of rules that limit high-risk contact. Single-component approaches leave major risk pathways unaddressed.

Question 17Injury Prevention and Risk Reduction

Which factor most increases the risk of stress fracture in a distance runner?

  1. Running on varied terrain
  2. A gradual 5% weekly mileage progression
  3. Adequate calcium intake
  4. A history of low energy availability Correct answer.

Explanation

Low energy availability disrupts bone remodeling and is a key contributor to stress fracture risk in runners. Gradual progression, adequate calcium, and varied terrain are not risk-increasing factors.

Question 18Injury Prevention and Risk Reduction

An athletic trainer is designing a prevention program for a team with a high rate of groin injuries. Which approach is best supported?

  1. Adductor strengthening with hip and core control training Correct answer.
  2. Isolated static adductor stretching before matches
  3. Hamstring curls performed only in-season
  4. Avoiding all change-of-direction drills

Explanation

Adductor strengthening combined with hip and core control training addresses the strength and coordination deficits linked to groin injury in field sports. Static stretching alone and avoiding sport-specific drills do not reduce risk.

Question 19Injury Prevention and Risk Reduction

Which measure is most appropriate for comparing injury rates between two teams with different exposure hours?

  1. Number of injured players per roster
  2. Mean injury severity score
  3. Raw injury counts
  4. Injuries per 1,000 athlete-exposures Correct answer.

Explanation

Expressing injuries per athlete-exposure standardizes for differing participation time, allowing valid comparison between teams. Raw counts and roster proportions are confounded by exposure, and severity does not reflect rate.

Question 20Injury Prevention and Risk Reduction

Which statement best characterizes the evidence for stretching as a stand-alone injury-prevention strategy?

  1. It has not been shown to meaningfully reduce injury risk when used alone Correct answer.
  2. It is more effective than strength training for prevention
  3. It reliably prevents muscle strain injuries
  4. It prevents all overuse tendon injuries

Explanation

Systematic reviews have not found that stretching alone meaningfully reduces injury risk, and it is best used as one part of a broader program emphasizing strength and neuromuscular control. Strength training has stronger preventive evidence for strain injuries.

Question 21Injury Prevention and Risk Reduction

A team physician is evaluating whether a new prevention program works. Which outcome measure best captures program effectiveness in a prospective cohort?

  1. Number of exercises included in the program
  2. Number of athletes who report liking the program
  3. Total minutes spent on the program
  4. Incidence rate of the target injury compared with a control period Correct answer.

Explanation

Effectiveness is determined by whether the incidence rate of the target injury falls relative to a comparison group or period. Program liking, duration, and exercise count are implementation descriptors rather than outcomes.

Question 22Injury Prevention and Risk Reduction

In a cohort of 200 athletes followed for one season, 20 sustain an injury. Which statement correctly interprets the cumulative incidence?

  1. 10% of athletes were injured during the season Correct answer.
  2. 10 per 1,000 athlete-exposures were injured
  3. 20% of athletes were injured during the season
  4. The injury rate cannot be expressed as a proportion

Explanation

Cumulative incidence equals new cases divided by the at-risk population, so 20 of 200 equals 10% over the season. The other figures misapply the numerator or confuse incidence proportion with an exposure-adjusted rate.

Question 23Injury Prevention and Risk Reduction

A high school basketball program wants to lower overall lower extremity injury risk. Which program structure best reflects current best practice?

  1. Equipment changes alone with no training component
  2. A multicomponent program performed regularly across the season Correct answer.
  3. A single preseason education session without follow-up
  4. Individualized stretching only for athletes with prior injury

Explanation

Effective prevention uses multicomponent programs delivered regularly and sustained across the season rather than one-time education or single-component approaches. Regular delivery supports retention and neuromuscular adaptation.

Question 24Injury Prevention and Risk Reduction

An athlete returning from a hamstring strain completes rehabilitation but shows a 15% eccentric strength deficit compared with the uninjured limb. What is the most appropriate interpretation?

  1. The deficit is irrelevant because symptoms have resolved
  2. The deficit confirms the athlete is fully prepared to return
  3. The deficit should be addressed only if pain returns
  4. The deficit indicates elevated reinjury risk and warrants further loading Correct answer.

Explanation

Persistent eccentric strength asymmetry after hamstring strain is associated with increased reinjury risk, so rehabilitation should continue until deficits are minimized. Symptom resolution alone does not confirm readiness, and waiting for pain to recur is unsafe.

Question 25Evaluation and Diagnosis

A patient reports burning pain over the lateral forearm with numbness in the distribution of the lateral antebrachial cutaneous nerve after a distal biceps repair. Which clinical finding would most directly support a peripheral nerve source for these symptoms?

  1. Reproduction of symptoms with cervical rotation and extension
  2. A positive Tinel sign over the antecubital fossa Correct answer.
  3. Pain with resisted wrist extension
  4. Hypoesthesia respecting the C6 dermatome

Explanation

A Tinel sign localizes abnormal nerve irritability to a specific segment along a peripheral nerve course, supporting a peripheral rather than radicular source. Cervical provocation and dermatomal patterns point toward a spinal level.

Question 26Evaluation and Diagnosis

Which muscle test is most specific for assessing the C5 myotome in isolation?

  1. Elbow flexion with the forearm supinated Correct answer.
  2. Shoulder abduction with the arm internally rotated
  3. Elbow extension with the forearm pronated
  4. Thumb interphalangeal flexion

Explanation

Elbow flexion with supination preferentially recruits the biceps brachii, a C5-C6 innervated muscle with strong C5 representation. The other maneuvers emphasize different root levels or overlap multiple levels.

Question 27Evaluation and Diagnosis

During examination a patient's pain is reproduced by passive straight leg raise at 35 degrees and relieved by ankle dorsiflexion but worsened by ankle plantarflexion. What do these findings most suggest?

  1. Femoral nerve root irritation
  2. Hip capsular restriction
  3. Lumbosacral nerve root mechanosensitivity Correct answer.
  4. Hamstring tightness limiting hip flexion

Explanation

Symptom provocation at low angles with sensitizing maneuvers (dorsiflexion) and relief with desensitizing maneuvers (plantarflexion) indicate neural mechanosensitivity rather than pure tissue tightness. This pattern is consistent with lumbosacral nerve root involvement.

Question 28Evaluation and Diagnosis

A patient demonstrates loss of pain and temperature sensation on the contralateral trunk beginning two levels below a spinal cord lesion with preserved vibration sense. Which pathway is most likely affected?

  1. Dorsal columns
  2. Medial lemniscus
  3. Dorsal root ganglion
  4. Spinothalamic tract Correct answer.

Explanation

The spinothalamic tract carries pain and temperature and decussates near the level of entry, producing contralateral loss beginning roughly one to two levels below the lesion. Dorsal column lesions produce ipsilateral loss of vibration and proprioception.

Question 29Evaluation and Diagnosis

Which finding best distinguishes a true leg length discrepancy from a functional discrepancy during a standing examination?

  1. A positive Trendelenburg sign on the short side
  2. Asymmetry of the posterior superior iliac spines
  3. Restricted hip internal rotation on the long side
  4. Asymmetry of the iliac crests that disappears with a heel lift Correct answer.

Explanation

A structural discrepancy corrects with a heel lift, whereas a functional or apparent discrepancy related to pelvic obliquity or soft tissue does not fully correct. This test helps differentiate the source of the asymmetry.

Question 30Evaluation and Diagnosis

Which cranial nerve is most appropriately screened by testing the gag reflex and observing palatal elevation?

  1. Facial nerve
  2. Hypoglossal nerve
  3. Trigeminal nerve
  4. Glossopharyngeal nerve Correct answer.

Explanation

The glossopharyngeal nerve provides sensory input for the gag reflex and motor supply to the stylopharyngeus, and it contributes to palatal elevation with the vagus. Testing the gag reflex therefore primarily screens CN IX.

Question 31Evaluation and Diagnosis

A patient reports pain in the posterior thigh that is reproduced with a prone knee bend and relieved by cervical flexion. Which structure is most implicated?

  1. Tibial nerve
  2. Obturator nerve
  3. Sciatic nerve
  4. Femoral nerve Correct answer.

Explanation

The prone knee bend tensions the femoral nerve, and cervical flexion adds tension along the neuraxis, so relief with cervical flexion supports a neural source. The femoral nerve distribution and this test pattern localize the finding to the femoral nerve.

Question 32Evaluation and Diagnosis

Which physical examination finding is most characteristic of an upper motor neuron lesion?

  1. Hyperreflexia with clonus Correct answer.
  2. Hyporeflexia with flaccid tone
  3. Fasciculations with muscle atrophy
  4. Dermatomal sensory loss

Explanation

Upper motor neuron lesions produce increased tone, hyperreflexia, and clonus due to loss of descending inhibition. Lower motor neuron lesions instead produce atrophy, fasciculations, and hyporeflexia.

Question 33Evaluation and Diagnosis

A patient with acute low back pain demonstrates a positive crossed straight leg raise. What does this finding most strongly suggest?

  1. Hip joint osteoarthritis
  2. A large disc herniation with significant nerve root compression Correct answer.
  3. Simple mechanical low back strain
  4. Piriformis syndrome

Explanation

A crossed straight leg raise, in which raising the unaffected leg reproduces symptoms in the affected leg, has high specificity for a substantial disc herniation with nerve root compression. Its high specificity means a positive result strongly supports the diagnosis.

Question 34Evaluation and Diagnosis

Which measure best quantifies a patient's perceived disability related to neck pain for use in examination and outcome tracking?

  1. Global rating of change
  2. Neck Disability Index Correct answer.
  3. Patient-specific functional scale
  4. Numeric pain rating scale

Explanation

The Neck Disability Index is a condition-specific self-report measure of disability related to neck pain and is used for both baseline examination and outcome tracking. Pain scales and global change ratings measure different constructs.

Question 35Evaluation and Diagnosis

During a shoulder examination, a patient reports apprehension when the arm is abducted and externally rotated, and the symptoms are reduced when a posterior force is applied to the humeral head. Which diagnosis is most supported?

  1. Posterior shoulder instability
  2. Anterior shoulder instability Correct answer.
  3. Adhesive capsulitis
  4. Subacromial impingement

Explanation

Apprehension in abduction and external rotation with relief from a posteriorly directed force is characteristic of anterior instability, as the posterior force reduces anterior translation of the humeral head. This is the basis of the apprehension-relocation test.

Question 36Evaluation and Diagnosis

Which finding on a dermatomal sensory examination is most consistent with a C7 root level?

  1. Lateral upper arm
  2. Little finger
  3. Thumb and index finger
  4. Middle finger Correct answer.

Explanation

The C7 dermatome includes the middle finger and the posterior aspect of the hand and forearm. Adjacent dermatomes cover the thumb and index finger (C6) and the little finger (C8).

Question 37Evaluation and Diagnosis

A patient with suspected cervical myelopathy is being examined. Which finding would most raise concern for myelopathy rather than radiculopathy?

  1. Positive Spurling test
  2. Unilateral dermatomal numbness
  3. Focal muscle atrophy
  4. Hoffmann sign Correct answer.

Explanation

A Hoffmann sign reflects hyperreflexia of the upper extremity and indicates corticospinal tract involvement, which supports myelopathy. Radicular findings are typically segmental and unilateral.

Question 38Evaluation and Diagnosis

Which test is most appropriate to assess for a posterior cruciate ligament injury of the knee?

  1. Posterior drawer test Correct answer.
  2. Valgus stress test
  3. McMurray test
  4. Lachman test

Explanation

The posterior drawer test directly assesses posterior translation of the tibia on the femur, which is the primary function of the posterior cruciate ligament. The Lachman test assesses the anterior cruciate ligament.

Question 39Evaluation and Diagnosis

A patient's ankle dorsiflexion strength is graded 3/5 and the examiner notes the patient can move through full range against gravity but not against resistance. What does this grade indicate?

  1. Active movement with gravity eliminated
  2. Active movement against gravity only Correct answer.
  3. Normal strength
  4. A trace of muscle contraction without movement

Explanation

On the Medical Research Council scale, grade 3 indicates active movement through the available range against gravity but not against added resistance. Grade 5 is normal and grade 1 is a trace contraction.

Question 40Evaluation and Diagnosis

During gait observation, a patient shows excessive anterior pelvic tilt, increased lumbar lordosis, and trunk leaning forward with each step. Which impairment is most likely contributing?

  1. Plantar flexor spasticity
  2. Hip abductor weakness
  3. Gluteus maximus weakness Correct answer.
  4. Hip flexor contracture

Explanation

Gluteus maximus weakness impairs hip extension during stance, so patients lean the trunk forward and increase anterior pelvic tilt to maintain the center of mass over the hip. This pattern is a common compensatory gait deviation.

Question 41Evaluation and Diagnosis

Which finding is most consistent with a median nerve lesion at the wrist rather than at the elbow?

  1. Weakness of finger flexors
  2. Positive Tinel sign at the elbow
  3. Loss of sensation over the thenar eminence
  4. Weakness of thumb abduction with thenar atrophy Correct answer.

Explanation

A lesion at the wrist spares the long finger flexors, which are innervated proximal to the carpal tunnel, but affects the thenar muscles supplied by the recurrent branch. Weak long finger flexion indicates a more proximal lesion.

Question 42Evaluation and Diagnosis

A patient reports a sensation of the knee giving way and the examiner finds a positive pivot shift. Which structure is most likely injured?

  1. Anterior cruciate ligament Correct answer.
  2. Patellofemoral joint cartilage
  3. Medial collateral ligament
  4. Posterior cruciate ligament

Explanation

The pivot shift test detects rotational instability from anterior cruciate ligament deficiency and correlates with functional giving-way. It is considered highly specific for ACL rupture.

Question 43Evaluation and Diagnosis

Which finding on a cranial nerve examination would most suggest a lesion of the oculomotor nerve?

  1. Ptosis with the eye deviated downward and outward Correct answer.
  2. Loss of upward gaze only
  3. Inability to abduct the eye
  4. Absent corneal reflex

Explanation

The oculomotor nerve supplies most extraocular muscles and the levator palpebrae, so palsy produces ptosis with the eye resting in a down-and-out position due to unopposed lateral rectus and superior oblique action. Abduction deficits instead reflect abducens palsy.

Question 44Evaluation and Diagnosis

A patient is being evaluated for thoracic outlet syndrome. Which provocative maneuver involves the patient taking a deep breath, turning the head toward the tested side, and holding the breath while the examiner monitors the radial pulse?

  1. Adson maneuver Correct answer.
  2. Roos test
  3. Wright test
  4. Costoclavicular maneuver

Explanation

The Adson maneuver combines cervical extension, rotation toward the tested side, and a deep breath to provoke compression at the scalene triangle while monitoring the pulse. The Roos and Wright tests use different positions.

Question 45Evaluation and Diagnosis

A patient presents with a steppage gait and foot drop. Which pattern of findings would most localize the lesion to the common fibular nerve at the fibular head rather than to an L5 root?

  1. Weakness of ankle dorsiflexion with preserved sensation
  2. Weakness of ankle dorsiflexion with weakness of ankle inversion
  3. Weakness of ankle dorsiflexion with weakness of ankle eversion and sensory loss over the dorsum of the foot Correct answer.
  4. Weakness of ankle dorsiflexion with weakness of hip abduction

Explanation

The common fibular nerve supplies both the anterior and lateral compartments, so lesions produce dorsiflexion and eversion weakness with sensory loss over the dorsum of the foot. An L5 root lesion would also affect hip abduction and ankle inversion through the tibialis posterior.

Question 46Evaluation and Diagnosis

Which test is most appropriate for identifying a labral tear of the hip?

  1. FABER test
  2. FADIR test Correct answer.
  3. Trendelenburg test
  4. Thomas test

Explanation

The FADIR test, which combines flexion, adduction, and internal rotation, is a sensitive screening test for hip labral pathology and intra-articular pain. The FABER test is more associated with sacroiliac or hip joint provocation.

Question 47Evaluation and Diagnosis

A patient with chronic ankle instability demonstrates a positive anterior drawer and a negative talar tilt. Which structure is most likely involved?

  1. Syndesmosis
  2. Anterior talofibular ligament Correct answer.
  3. Calcaneofibular ligament
  4. Deltoid ligament

Explanation

The anterior drawer test assesses the anterior talofibular ligament, the most commonly injured lateral ankle ligament, while the talar tilt assesses the calcaneofibular ligament. A positive drawer with a negative tilt points to the anterior talofibular ligament.

Question 48Evaluation and Diagnosis

Which of the following best describes the purpose of using a likelihood ratio when interpreting a special test result?

  1. It measures the reliability of a single examiner
  2. It converts a pretest probability into a posttest probability Correct answer.
  3. It quantifies the magnitude of change in a functional outcome
  4. It estimates the prevalence of a condition in a population

Explanation

Likelihood ratios summarize the diagnostic value of a test result and allow conversion of pretest probability into posttest probability. They are derived from sensitivity and specificity and inform clinical decision-making.

Question 49Evaluation and Diagnosis

A patient demonstrates weakness of shoulder external rotation and sensory loss over the lateral arm. Which nerve is most likely affected?

  1. Radial nerve
  2. Axillary nerve Correct answer.
  3. Suprascapular nerve
  4. Musculocutaneous nerve

Explanation

The axillary nerve supplies the deltoid and teres minor and provides sensation over the lateral arm, so its involvement produces external rotation weakness with lateral arm sensory loss. The suprascapular nerve supplies the infraspinatus but has no cutaneous distribution.

Question 50Evaluation and Diagnosis

Which clinical finding best distinguishes a peripheral vestibular disorder from a central vestibular disorder during an acute dizziness evaluation?

  1. Nystagmus that is unidirectional and suppresses with visual fixation Correct answer.
  2. Nausea and vomiting that worsen with head movement
  3. Intense rotational vertigo accompanied by diaphoresis
  4. Presence of vertical nystagmus that does not suppress with visual fixation

Explanation

Peripheral lesions typically produce unidirectional, horizontal-rotatory nystagmus that is suppressed by visual fixation, whereas central lesions produce direction-changing or vertical nystagmus that fixation does not suppress. The other features listed can occur in either category.