SEM 3 - MSK wk. 1-10

A patient is observed performing repeated sagittal plane trunk movements. No history or examination findings are available.

Based on applied anatomy and biomechanics, which spinal motion is MOST dependent on the combined influence of intervertebral disc deformation and facet joint orientation?

 

 

• Thoracic Extension

• Lumbar flexion

• Lumbar axial rotation

• Lumbar Extension

• Lumbar Extension

A patient works from home and reports sitting for several hours per day. They describe generalized lumbar discomfort that improves with standing and movement. They deny distal lower-extremity symptoms, night pain, or a history of trauma.

Based on posture and sustained loading alone, which tissue is most plausibly exposed to increased mechanical stress?

 

 

• Lumbar intervertebral disc

• Lumbar spinous processes

• Lumbar facet joints

• Sacroiliac joint

• Lumbar intervertebral disc

A patient reports pain localized to the low back and right buttock region. They deny numbness, tingling, or symptoms distal to the knee. Pain intensity varies day to day.

At the end of Week 1 ASYNCH content, which conclusion is MOST appropriate?

 

 

• Sacroiliac joint pathology is the primary diagnosis

• Nerve root involvement should be prioritized

• Red flag pathology is likely

• Multiple lumbopelvic contributors remain plausible

• Multiple lumbopelvic contributors remain plausible

A patient reports low back pain that changes with sitting posture and prolonged flexed positions. They also note mild morning stiffness that resolves quickly.

Which feature is MOST consistent with disc-related conditions as presented in the Week 1 ASYNCH material?

 

• Symptoms only present with walking

• Symptom behavior influenced by sustained or repeated spinal loading

• Pain isolated to the PSIS region

• Symptoms unrelated to posture or load

• Symptom behavior influenced by sustained or repeated spinal loading

A 55-year-old presents with low back pain that worsens during prolonged standing and improves slightly with sitting. There are no neurological complaints.

Facet joint–related pain is MOST plausibly influenced by which biomechanical factor?

 

 

• Neural tension

• Prolonged unloaded positioning

• Sustained spinal flexion

• Axial compression combined with extension bias

• Axial compression combined with extension bias

A patient presents with unilateral low back and buttock pain. They deny trauma, leg symptoms, or bowel/bladder changes.

Which statement BEST reflects appropriate Week 1 reasoning regarding potential sacroiliac joint involvement?

 

• SIJ involvement requires neurological symptoms

• Unilateral pain confirms SIJ involvement

• SIJ may remain plausible based on location alone but is non-specific

• SIJ can be excluded without history or examination

• SIJ may remain plausible based on location alone but is non-specific

A physically active individual reports low back discomfort during prolonged activity but minimal pain at rest. No imaging is available.

Lumbar hypermobility is MOST appropriately considered in Week 1 ASYNCH content as relating to:

 

• Acute inflammatory pathology

• Excessive passive joint motion with pain at end-range

• Reduced structural control under load

• Disc extrusion with radiculopathy

• Reduced structural control under load

A warehouse employee reports gradually worsening low back discomfort over several months. They cannot identify a specific injury but perform repetitive lifting daily.

Which presentation is MOST compatible with repetitive or cumulative lumbar trauma?

 

• Acute neurological deficit

• Sudden onset pain after a single lift

• Gradual symptom development with repeated low-level loading

• Constant pain unrelated to activity

• Gradual symptom development with repeated low-level loading

A patient reports low back pain that does not change with posture or movement. They also report night pain and unintended weight loss over the past two months.

Which finding should raise concern for potential non-mechanical pathology?

 

• Night pain with unexplained weight loss

• Intermittent pain that improves with activity

• Pain reproduced with lumbar motion

• Pain localized above the gluteal fold

• Night pain with unexplained weight loss

After completing the Week 1 ASYNCH material, a student states:
“I’m not sure what the diagnosis is yet, but several structures could be involved.”

Which statement BEST supports this reasoning?

 

• Most competing explanations can now be excluded

• Several pathoanatomical contributors may remain plausible

• Directional preference should already be clear

• A primary diagnosis should already be identified

• Several pathoanatomical contributors may remain plausible

A patient reports low back pain present for 4 weeks. Symptoms are intermittent, improve with rest, and are not associated with trauma, systemic illness, or neurological complaints.

Based on Week 2 ASYNCH content, the PRIMARY value of this historical information is:

 

• Excluding non-mechanical causes of symptoms

• Modifying the relative likelihood of possible contributors

• Establishing a definitive structural diagnosis

• Determining an immediate treatment approach

• Modifying the relative likelihood of possible contributors

A patient reports low back pain that has progressively worsened over the past month. Symptoms are present daily and have not improved despite reduced activity. The patient denies numbness, tingling, weakness, fever, or recent trauma.

Based on Week 2 ASYNCH material, this information MOST appropriately:

 

• Suggests central sensitization as the primary driver

• Confirms the absence of neurological involvement

• Raises concern and prompts closer clinical monitoring

• Indicates a mechanical condition requiring exercise progression

• Raises concern and prompts closer clinical monitoring

Which symptom presentation MOST appropriately raises concern for non-mechanical contributors, based on Week 2 ASYNCH teaching?

 

• Symptoms that vary with posture and movement

• Symptoms that improve with unloading or rest

• Symptoms that are constant and unrelated to activity

• Symptoms reproduced the repeated motion testing

• Symptoms that are constant and unrelated to activity

A patient reports low back pain that is worsening over time, not clearly influenced by posture or activity, and present at night without meaningful relief from rest.

Based on Week 2 ASYNCH content, this history MOST appropriately:

 

• Increases clinical concern and the need for ongoing vigilance

• Confirms the presence of a non-mechanical condition

• Predicts a prolonged recovery from mechanical pain

• Identifies the primary source of the symptoms

• Increases clinical concern and the need for ongoing vigilance

A patient demonstrates full lumbar flexion and extension during active range of motion testing, with mild pain reported at end range. Movement quality appears guarded, and symptoms do not change following single movements.

According to Week 2 ASYNCH material, which statement is MOST accurate?

 

• Active motion alone provides limited insight into symptom behavior

• The absence of symptom change suggests a non-mechanical source

• Guarded movement confirms fear-avoidant behavior

• Normal range of motion reduces concern for disc involvement

• Active motion alone provides limited insight into symptom behavior

A patient demonstrates reduced trunk endurance compared to age-matched norms but reports no change in symptoms during testing.

Based on Week 2 ASYNCH teaching, this finding MOST appropriately contributes to:

 

• Characterizing physical capacity and symptom tolerance

• Confirming the presence of segmental instability

• Excluding neurological involvement

• Localizing the primary pain generator

Characterizing physical capacity and symptom tolerance

A patient reports tenderness during palpation of lumbar paraspinal tissues, but symptoms are not reproduced with movement or loading.

Based on Week 2 ASYNCH content, palpation findings are MOST appropriately used to:

 

• Confirming the specific pain source

• Excluding disc-related involvement

• Diagnosing isolated soft tissue pathology

• Providing contextual information about tissue irritability

• Providing contextual information about tissue irritability

A patient demonstrates intact strength, sensation, and reflexes despite reporting intermittent buttock pain.

Based on Week 2 ASYNCH material, this neurological screen MOST appropriately suggests:

 

• Indicating the presence of disc herniation

• Confirming a mechanical source of pain

• Eliminating the possibility of neural involvement

• Reducing the likelihood of nerve root compromise

• Reducing the likelihood of nerve root compromise

A clinician performs a lumbar special test known to have high sensitivity for a suspected condition. The test is performed late in the examination and does not reproduce the patient’s symptoms.

Based on Week 2 ASYNCH content, this finding MOST appropriately:

 

• Confirms the absence of the suspected condition

• Eliminates the need for further examination

• Decreases the probability of the suspected condition

• Identifies the structure responsible for symptoms

• Decreases the probability of the suspected condition

Based on the Week 2 ASYNCH presentation of the 2012 Low Back Pain Clinical Practice Guidelines, the PRIMARY purpose of classification categories is to:

 

Identifying a preferred treatment approach

 

Replacing elements of the physical examination

 

Selecting a specific exercise intervention

 

Estimating probability to support ongoing clinical reasoning

Estimating probability to support ongoing clinical reasoning

Which structure is primarily responsible for transferring load between the trunk and lower extremities?

Lumbar intervertebral discs

Lumbar facet joints

Sacroiliac joints

Paraspinal muscles

Sacroiliac joints

Which region contributes most to flexion and extension motion within the lumbopelvic system?

Sacroiliac joints

Pelvic ring

Lumbar spine

Hip joints

Lumbar spine

During lumbar extension, what happens to the intervertebral foramina?

They enlarge bilaterally

They remain unchanged

They narrow bilaterally

One enlarges while the other narrows

They narrow bilaterally

Which structure contributes most to resisting shear and rotation in a lumbar motion segment?

Facet joints and disc shape

Paraspinal muscles alone

Abdominal wall only

Nerve roots

Facet joints and disc shape

oss of force closure due to fatigue most often begins with dysfunction of which structure?

Vertebral bodies

Multifidus and deep stabilizers

Facet cartilage

Endplates

Multifidus and deep stabilizers

Which pathology is most associated with symptoms related to time-under-tension rather than a single movement?

Acute muscle strain

Disc herniation

Repetitive cumulative trauma

Pars defect

Repetitive cumulative trauma

Which tissue commonly contributes to localized pain with palpation, contraction, and stretch?

Lumbar disc

Facet joint capsule

Paraspinal muscle

Spinal nerve root

Paraspinal muscle

Which condition is most associated with posture-dependent changes in available space for neural tissue?

Muscle strain

Lumbar spinal stenosis

Facet synovitis

SIJ irritation

Lumbar spinal stenosis

Which mechanism best explains fluctuating symptoms with fatigue and repeated loading?

Acute inflammation alone

Central sensitization only

Loss of force closure and load distribution

Structural fracture

Loss of force closure and load distribution

In Week 1, why should high-risk considerations (e.g, sinister pathology, vascular conditions) remain explicitly documented in the Pathoanatomical CRIM section?

Because they are common causes of low back pain

Because anatomy and biomechanics alone cannot provide exclusionary evidence

Because they typically respond poorly to physical therapy

Because they always present with neurological signs

Because anatomy and biomechanics alone cannot provide exclusionary evidence

After Week 1, which statement best reflects appropriate handling of pathoanatomical hypotheses?

Hypotheses should be down-weighted until confirmed

Hypotheses should be weighted based on anatomy alone

Mechanically plausible hypotheses should remain broadly viable until evidence excludes them

Only common conditions should be retained

Mechanically plausible hypotheses should remain broadly viable until evidence excludes them

After Week 1, what is the MOST appropriate use of the Pathoanatomical section of the Clinical Reasoning Integration Matrix (CRIM)?

To identify the most likely pain generator based on anatomy alone

To finalize pathoanatomical likelihoods before selecting interventions

To document current confidence in possible structures, recognizing these values are expected to change as history and examination findings are added

To leave the matrix blank until all examination findings are available

To document current confidence in possible structures, recognizing these values are expected to change as history and examination findings are added

Which daily movement pattern is most plausibly contributing to lumbar loading based on the patient's reported aggravating and relieving factors?

Symptoms worsen with flexion activities

Symptoms improve with upright activities

Transitional pain when rising from sitting

Diurnal pattern with worsening later in the day

Symptoms worsen with flexion activities

What is the primary purpose of patient history in lumbar differential diagnosis?

To narrow mechanisms, symptom behavior, and classification before physical testing.

Why can most lumbar conditions not be diagnosed with a single test or symptom?

Because multiple tissues can produce similar symptom patterns.

Why should imaging findings be interpreted cautiously in low back pain?

Because imaging abnormalities are common in asymptomatic individuals.

How do patient history and self-report differ in clinical use?

History narrows the differential; self-report contextualizes impact and disability.

What does patient self-report primarily measure?

Severity, disability, psychosocial risk, prognosis, and response to care.

What information can ONLY be obtained from patient history (not the exam)?

Symptom location, duration, constancy, and trend over time.

What does central lumbar pain most strongly suggest? Common mechanical contributors to central lumbar pain include what?

A mechanical driver without identifying a specific tissue.

Discogenic irritation, muscle strain, hypermobility, cumulative trauma.

What CPG classifications commonly align with central lumbar pain?

Mobility deficits and movement coordination impairments.

Why does unilateral lumbar pain NOT automatically indicate nerve root involvement?

Because it may represent non-dermatomal referred pain.

Dermatomal pain increases suspicion for what?

Neural involvement.

Possible contributors to unilateral lumbar or buttock pain?

Facet joints, SIJ, unilateral discogenic referral.

Common causes of anterior thigh pain?

Upper lumbar disc referral, L2–L3 radiculopathy, facet joints (L2–L4), SIJ, hip pathology.

Common causes of posterior thigh pain?

Discogenic referral, facet joints (L4–S1), SIJ, radiculopathy.

Symptoms distal to the knee increase suspicion for what conditions?

Radiculopathy, spinal stenosis, claudication, peripheral nerve involvement.

At this stage of evaluation, what is the goal regarding distal symptoms?

Recognize patterns, not confirm etiology.

Key features of neurogenic claudication?

Worse with standing/walking, relieved by sitting or flexion, variable distance tolerance.

Key features of vascular claudication (red flag)?

Exertion-dependent, not posture-dependent, relieved by rest only.

Common contributors to acute low back pain (<6 weeks)? Common contributors to subacute pain (6–12 weeks)? Common contributors to chronic pain (>12 weeks)?

Muscle strain, facet joint, acute discogenic pain, SIJ sprain.

Developing instability, persistent discogenic pain, cumulative trauma, facet, SIJ.

Movement coordination impairments, degenerative changes, central sensitization, cumulative trauma.

What does intermittent pain strongly suggest?

Mechanical origin.

Why does intermittent pain increase suspicion of mechanical disorder?

It reflects load or position sensitivity.

What does constant pain indicate?

Higher irritability, not necessarily non-mechanical pathology.

When is constant pain concerning?

When accompanied by non-mechanical features or red flags.

Red flags related to pain constancy include what?

Unrelenting night pain, no mechanical modifiers, systemic symptoms.

Why must symptom trend be interpreted relative to duration?

Timeframes change the clinical meaning of “recent” symptoms.

Worsening symptoms may indicate what? Improving symptoms suggest what?

Progressive deformation, radiculopathy, stenosis, cumulative trauma, or red flags.

Favorable mechanical behavior and tissue healing.

What is the primary purpose of MOI in history taking?

Assess plausibility, not diagnose tissue.

Why is minor trauma with severe symptoms concerning?

It raises suspicion for non-mechanical pathology.

Does insidious onset rule out mechanical pain?

No

Four core historical features that guide lumbar differential diagnosis?

Location, duration, constancy, and symptom trend.

What principle should guide interpretation of tests and findings?

Convergence of history, exam, and response—not single-test confirmation.

What is lesion behavior in the context of low back pain? Common activities used to assess lesion behavior?

The mechanical fingerprint of the condition based on symptom response to load, position, and movement.

Bending, sitting, rising from sitting, standing, walking, lying positions, time of day, still vs moving.

Primary clinical task when identifying lesion behavior?

Guide selection of force, load, time, and direction during the exam.

How should prior history be used in clinical reasoning?

To inform pattern recognition, not override the current presentation.

Key elements of prior history to assess?

Prior episodes, prior care and response, injections/surgery, imaging impact, self-management strategies.

What is the primary role of patient self-report measures?

Describe symptom impact and risk, not tissue source.

Clinical uses of self-report measures?

Establish baseline, monitor change, inform prognosis.

What does the NPRS measure? What does the PSFS measure?

Pain intensity only.

Task-specific functional limitation.

What does the Modified Oswestry Disability Index assess?

Disability related to low back pain.

FABQ score >19 suggests what?

Elevated risk for poor outcome due to fear-avoidance.

Examples of psychosocial risk screening tools?

FABQ, Yellow Flag Risk Form, STarT Back, OSPRO-YF.

Purpose of the Global Rating of Change?

Patient-perceived change over time.

Purpose of ROS screening in low back pain?

Safety, not diagnosis.

How do red flags affect the exam?

Guide exam modification and risk awareness.

Key neurologic red flags? Systemic red flags include? Oncologic red flags include? Infectious red flags include? Vascular red flags include?

Bowel/bladder changes, saddle anesthesia, progressive weakness, new gait disturbance.

Fever, chills, unexplained weight loss, night sweats.

History of cancer, new pain not responding to mechanical change.

Recent infection, IV drug use, immunosuppression.

Vascular risk factors, claudication-type symptoms.

Medications that increase risk during exam?

Steroids, anticoagulants, immunosuppressants.

What do aggravating/relieving factors do diagnostically?

Shift probability; they do not confirm tissue source.

Discogenic Probability ↑ // History features increasing discogenic probability?

Flexion/sitting intolerance, morning stiffness improving with movement, prior centralization, non-dermatomal distal referral.

Facet Probability ↑ // History features increasing facet contribution?

Extension/standing intolerance, pain with transitions, localized unilateral LBP, thigh referral (posterior or anterior L2–L4).

SIJ Probability ↑ // History features increasing SIJ contribution?

Unilateral buttock pain, load asymmetry intolerance, transitional task sensitivity.

Stenosis Probability ↑ // History features increasing stenosis probability?

Walking intolerance relieved by sitting/flexion, age-related onset, bilateral variable LE symptoms.

Features suggesting Directional Preference / Specific Exercise?

Clear flexion or extension sensitivity, prior directional response, centralization history.

Features suggesting Movement Coordination Impairment?

Recurrent episodes, “giving way,” pain with transitions, prolonged posture intolerance.

Features suggesting Mobility Deficits / Manipulation?

Acute onset, no distal symptoms, low fear avoidance, localized pain.

Current evidence position on traction?

Historically proposed but not routinely recommended.

If history does not shift probability, what is likely true?

The exam rarely will.

First question before examination?

Is there anything I must avoid or modify?

What does “Caution ≠ Inaction” mean?

Test with monitoring, not avoidance.

What should the exam challenge?

Competing hypotheses, not clinician favorites.

Most powerful tool in lumbar differential diagnosis?

Patient history.

What does symptom behavior reflect?

Mechanical loading.

What should clinicians keep during evaluation?

A short list of hypotheses, not a conclusion.

Role of the physical exam overall?

Refine and confirm history-based hypotheses.

What CAN observation help identify?

Asymmetry, guarding/fear, aberrant movement, load avoidance, coordination deficits

What CANNOT be determined by observation alone?

Specific pain generator, instability, alignment, or replacement of testing.

Key boundary statement for posture and movement?

They are descriptive, not diagnostic.

How should scoliosis observed in standing be framed?

Structural vs functional appearance only, not diagnosis.

What is a lateral shift? Why is a lateral shift clinically relevant? How does a lateral shift often change?

Trunk displacement relative to the pelvis in standing. May represent symptom avoidance and affect AROM interpretation.