10.1 Degenerative & Overuse Musculoskeletal Disorders: Osteoarthritis, Tendinopathies & Spine Disorders

Degenerative & Overuse Musculoskeletal Disorders: Osteoarthritis, Tendinopathies & Spine Disorders

Musculoskeletal complaints account for over 20% of all primary care encounters and represent the leading cause of chronic disability and functional impairment in adult and geriatric populations. For the Adult-Gerontology Primary Care Nurse Practitioner (AGPCNP), board certification demands precision in physical examination maneuvers, mastery of radiographic interpretation, judicious use of advanced diagnostic imaging, and evidence-based pharmacologic and non-pharmacologic management that minimizes adverse drug events in older adults.

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1. Osteoarthritis (OA / Degenerative Joint Disease)

Pathophysiology & Structural Failure

Osteoarthritis is not merely "wear and tear" of cartilage; it is an active, biomechanically and biochemically driven disease of the entire synovial joint involving articular cartilage degradation, chondrocyte hypertrophy, matrix metalloproteinase (MMP) upregulation, subchondral bone remodeling, marginal osteophytosis, and low-grade synovial inflammation.

+---------------------------------------------------------------------------------------------------+
|                               OSTEOARTHRITIS PATHOGENIC CASCADE                                   |
|                                                                                                   |
|   Mechanical Overload + Genetic Predisposition + Age-Related Senescence                           |
|                                     |                                                             |
|                                     v                                                             |
|   Chondrocyte Stress & Phenotypic Shift (Secretion of IL-1beta, TNF-alpha, MMP-13, ADAMTS-5)      |
|                                     |                                                             |
|                                     v                                                             |
|   Breakdown of Type II Collagen & Aggrecan Core Proteins (Loss of Hydration & Elasticity)         |
|                                     |                                                             |
|                                     v                                                             |
|   Cartilage Fissuring, Erosion & Full-Thickness Chondral Denudation                               |
|                                     |                                                             |
|                                     v                                                             |
|   Subchondral Bone Exposure -> Sclerosis (Eburnation) + Microfractures + Subchondral Cysts        |
|                                     |                                                             |
|                                     v                                                             |
|   Periosteal Chondrogenesis & Endochondral Ossification -> Marginal Bone Spurs (OSTEOPHYTES)      |
+---------------------------------------------------------------------------------------------------+

Clinical Presentation & Joint Distribution

• Pain Pattern: Deep, aching joint pain that is characteristically worsened by joint use, weight-bearing, and physical activity, and relieved by rest (in early disease; advanced OA causes resting and nocturnal pain).
• Stiffness ("Gel Phenomenon"): Morning joint stiffness is brief, characteristically lasting $<30\text{ minutes}$. Patients also experience transient stiffness after periods of daytime inactivity (e.g., getting up from a chair).
• Joint Distribution:
  • Hands: Distal interphalangeal (DIP) joints, proximal interphalangeal (PIP) joints, and the first carpometacarpal (CMC / base of thumb) joint.
  • Lower Extremities: Knees (tibiofemoral and patellofemoral compartments), hips (acetabulofemoral), and first metatarsophalangeal (MTP) joints.
  • Spine: Cervical (C5-C7) and lumbar (L3-S1) facet joints and intervertebral discs.
  • Characteristic Spares: Osteoarthritis characteristically SPARES the metacarpophalangeal (MCP) joints, wrists, elbows, and ankles (unless secondary to prior major intra-articular trauma or metabolic disease).

+---------------------------------------------------------------------------------------------------+
|                         OSTEOARTHRITIS vs. RHEUMATOID ARTHRITIS MATRIX                            |
|                                                                                                   |
|   CLINICAL FEATURE            OSTEOARTHRITIS (OA)                RHEUMATOID ARTHRITIS (RA)        |
|   ---------------------------------------------------------------------------------------------   |
|   Underlying Pathology        Non-inflammatory degenerative      Autoimmune systemic synovitis    |
|   Joint Symmetry              ASYMMETRIC / Unilateral            SYMMETRIC / Bilateral            |
|   Morning Stiffness Duration  < 30 minutes ("Gel phenomenon")    > 60 minutes (prolonged)         |
|   Pain Trajectory             Worsens with activity/end of day   Improves with movement/use       |
|   Hand Joint Distribution     DIP (Heberden), PIP (Bouchard),    MCP, PIP, Wrist, MTP             |
|                               1st CMC (Base of thumb)            (SPARES DIP and thoracolumbar)   |
|   Physical Palpation          Hard, bony, cool enlargement       Spongy, warm, boggy synovitis    |
|   Systemic Symptoms           ABSENT (no fever, fatigue, weight) PRESENT (fatigue, fever, anemia) |
|   Inflammatory Markers        NORMAL (ESR, CRP normal)           ELEVATED (ESR, CRP, Ferritin)    |
|   Autoantibodies              Negative (RF, anti-CCP negative)   Positive (anti-CCP, RF positive) |
+---------------------------------------------------------------------------------------------------+

Physical Examination Signs in Osteoarthritis

• Heberden Nodes: Bony, hard enlargement located at the Distal Interphalangeal (DIP) joints.
• Bouchard Nodes: Bony, hard enlargement located at the Proximal Interphalangeal (PIP) joints.
• Crepitus: Coarse, audible or palpable crunching/grating sensation during active or passive joint range of motion reflecting cartilage loss and denuded bone rubbing.
• Bony Enlargement & Deformity: Joint expansion, fixed flexion contractures, genu varum ("bowleg" from medial compartment knee OA) or genu valgum ("knock-knee" from lateral compartment OA).
• Joint Effusion: Cool, non-inflammatory joint fluid accumulation without marked erythema or warmth.

Radiographic Grading (Kellgren-Lawrence Classification)

Plain weight-bearing radiographs (anteroposterior, lateral, and sunrise/skyline views for knee) remain the imaging standard:

+---------------------------------------------------------------------------------------------------+
|                       KELLGREN-LAWRENCE (K-L) RADIOGRAPHIC GRADING OF OA                          |
|                                                                                                   |
|   GRADE 0: None       - No radiographic features of osteoarthritis.                               |
|   GRADE 1: Doubtful   - Minute osteophyte of doubtful significance; doubtful joint space narrowing.|
|   GRADE 2: Mild       - Definite osteophytes, unimpaired or possible joint space narrowing.        |
|   GRADE 3: Moderate   - Moderate multiple osteophytes, definite joint space narrowing, some       |
|                         subchondral sclerosis, possible deformity of bone contour.                |
|   GRADE 4: Severe     - Large osteophytes, marked joint space narrowing ("bone-on-bone"), severe   |
|                         subchondral sclerosis, and definite contour deformity of bone ends.       |
+---------------------------------------------------------------------------------------------------+

Guideline-Directed Management (ACR / AAOS Guidelines)

1. Non-Pharmacologic Management (Universal Foundation)

• Weight Loss: Strongly recommended for all overweight/obese patients. A weight reduction of $\ge 5\text{--}10%$ of total body weight yields a clinically significant $>50%$ reduction in knee pain and decelerates cartilage degradation (each pound lost removes 4 pounds of compressive force per step on the tibiofemoral joint).
• Exercise: Low-impact aerobic conditioning (walking, aquatic therapy, cycling) combined with quadriceps and hip abductor strengthening exercises.
• Assistive Devices: Using a cane held in the contralateral hand (opposite to the affected weight-bearing limb) reduces joint contact forces by up to 30%. Lateral wedge insoles for subtalar realignment.

2. Pharmacotherapy: Stepwise Evidence-Based Algorithm

+---------------------------------------------------------------------------------------------------+
|                         STEPWISE PHARMACOTHERAPY ALGORITHM FOR OA                                 |
|                                                                                                   |
|   STEP 1: TOPICAL THERAPY (Preferred First-Line for Knee and Hand OA)                             |
|   - Topical Diclofenac 1% gel (Voltaren gel): 2-4 g applied QID to affected joint.                |
|   - Delivers equivalent efficacy to oral NSAIDs with minimal systemic absorption (<5%),           |
|     avoiding GI, renal, and cardiovascular toxicity. Ideal for adults age >= 65!                  |
|   - Topical Capsaicin 0.025-0.075%: Substance P depleting agent (counsel on burning sensation).   |
|                                     |                                                             |
|                                     v (Inadequate relief / Multi-joint involvement)               |
|   STEP 2: ORAL NONSTEROIDAL ANTI-INFLAMMATORY DRUGS (NSAIDs)                                      |
|   - Lowest effective dose for the shortest duration (e.g., Ibuprofen, Naproxen, Meloxicam,       |
|     Celecoxib).                                                                                   |
|   - High GI Risk: Prescribe COX-2 selective inhibitor (Celecoxib 100-200 mg/day) OR non-selective  |
|     NSAID co-prescribed with a Proton Pump Inhibitor (PPI).                                       |
|   - High CV / Renal Risk: AVOID oral NSAIDs if eGFR < 30 mL/min, decompensated CHF, or unmanaged   |
|     hypertension. If NSAID mandatory in CV disease, Naproxen has lowest relative thrombotic risk. |
|                                     |                                                             |
|                                     v (Neuropathic/Centralized pain overlap)                      |
|   STEP 3: SEROTONIN-NOREPINEPHRINE REUPTAKE INHIBITORS (SNRIs)                                    |
|   - Duloxetine (Cymbalta) 30-60 mg daily: Strongly recommended by ACR for chronic knee/hip OA   |
|     with concomitant depression, chronic widespread pain, or contraindications to NSAIDs.         |
|                                     |                                                             |
|                                     v (Acute flare / Refractory localized joint pain)              |
|   STEP 4: INTRA-ARTICULAR INJECTIONS                                                              |
|   - Intra-articular Corticosteroids (e.g., Triamcinolone 40 mg + Lidocaine): Provides rapid,      |
|     short-term pain relief (4 to 12 weeks). Limit frequency to no more than 3-4 injections/year   |
|     due to risk of accelerated chondral loss and subchondral necrosis.                            |
|   - Intra-articular Hyaluronic Acid (Viscosupplementation): Conditionally NOT recommended by ACR  |
|     due to inconsistent clinical trial efficacy and high cost.                                    |
+---------------------------------------------------------------------------------------------------+

[!CAUTION] Treatments NOT Recommended or Strongly Discouraged in OA:

• Acetaminophen (Paracetamol): Recent ACR/AAOS guidelines demonstrate minimal to no clinical benefit over placebo in knee/hip OA; high risk of hepatotoxicity if dosed $>3\text{ g/day}$ in older adults.
• Oral Opioids (Tramadol, Oxycodone): Strongly recommended against due to lack of long-term efficacy, severe risk of dependence, cognitive impairment, sedation, and catastrophic fall/fracture risk in older adults.
• Glucosamine and Chondroitin: Strongly recommended against by ACR due to lack of reproducible efficacy in blinded randomized trials.

3. Surgical Management

• Total Joint Arthroplasty (TJA / Knee or Hip Replacement): Indicated for patients with end-stage osteoarthritis (Kellgren-Lawrence Grade 3 or 4) who have intractable pain and profound functional limitation refractory to optimized non-pharmacologic and pharmacologic therapies.

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2. Upper Extremity Overuse Tendinopathies & Entrapment Syndromes

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|                    UPPER EXTREMITY PROVOCATIVE PHYSICAL EXAMINATION MANEUVERS                     |
|                                                                                                   |
|   ANATOMICAL SITE       PROVOCATIVE TEST           PATHOLOGY / TARGET TENDON OR NERVE             |
|   ---------------------------------------------------------------------------------------------   |
|   Shoulder              Neer Impingement Test      Subacromial Impingement / Supraspinatus        |
|   Shoulder              Hawkins-Kennedy Test       Subacromial Impingement / Rotator Cuff         |
|   Shoulder              Empty Can (Jobe) Test      Supraspinatus Tendinopathy / Tear              |
|   Shoulder              Drop Arm Test              Full-Thickness Supraspinatus Tear              |
|   Shoulder              Lift-Off / Bear-Hug Test   Subscapularis Tendon Tear                      |
|   Shoulder              Speed / Yergason Test      Biceps Tendinopathy (Long head)                |
|   Elbow                 Cozen / Mill Test          Lateral Epicondylitis (Extensor Carpi Radialis)|
|   Elbow                 Resisted Wrist Flexion     Medial Epicondylitis (Flexor-Pronator mass)    |
|   Wrist / Thumb         Finkelstein Test           De Quervain Tenosynovitis (APL & EPB)          |
|   Wrist / Hand          Phalen & Tinel Tests       Carpal Tunnel Syndrome (Median Nerve)          |
|   Wrist / Hand          Durkan Compression Test    Carpal Tunnel Syndrome (Highest Sensitivity)   |
+---------------------------------------------------------------------------------------------------+

A. Rotator Cuff Tendinopathy, Tears & Subacromial Impingement

The rotator cuff comprises four dynamic stabilizing muscles (SITS):

1. Supraspinatus: Abduction initiation ($0\text{--}15^\circ$); most frequently torn tendon.
2. Infraspinatus: External rotation.
3. Teres Minor: External rotation and adduction.
4. Subscapularis: Internal rotation.

Provocative Diagnostic Maneuvers:

• Neer Impingement Test: Passively forward flex the fully pronated arm to maximum overhead elevation while stabilizing the scapula. Positive if pain is elicited (compresses supraspinatus against anteroinferior acromion).
• Hawkins-Kennedy Test: Forward flex shoulder to $90^\circ$ with elbow flexed to $90^\circ$, then forcefully internally rotate the arm. Positive if pain is elicited (compresses supraspinatus against coracoacromial ligament).
• Empty Can (Jobe) Test: Abduct arm to $90^\circ$, forward flex $30^\circ$ in the scapular plane, internally rotate fully (thumbs pointing down), and apply downward resistance. Positive if pain or weakness (isolates supraspinatus).
• Drop Arm Test: Passively abduct arm to $90^\circ$ and ask patient to slowly lower it to side. Positive if the arm drops suddenly with severe pain, indicating a full-thickness supraspinatus tear.
• Diagnostics & Management: Plain radiographs (AP, true glenohumeral, axillary, scapular Y views) rule out calcific tendinitis, acromial spurs, and OA. MRI of the shoulder is the gold standard for full-thickness vs. partial-thickness tears. First-line therapy includes physical therapy (rotator cuff and periscapular strengthening), NSAIDs, subacromial corticosteroid injection, and surgical repair for acute traumatic full-thickness tears in active adults.

B. Adhesive Capsulitis ("Frozen Shoulder")

• Pathophysiology: Fibroblastic proliferation and capsular contraction resulting in progressive contracture of the glenohumeral capsule. Highly associated with Diabetes Mellitus (up to 20% prevalence), thyroid disorders, and prolonged shoulder immobilization.
• Clinical Stages:
  1. Freezing Stage (2–9 months): Progressive, severe, diffuse aching pain, worse at night.
  2. Frozen Stage (4–12 months): Pain diminishes, but profound stiffness and restricted motion persist.
  3. Thawing Stage (5–24 months): Gradual recovery of motion.
• Physical Exam Hallmark: Marked global reduction in BOTH active AND passive range of motion, particularly external rotation and abduction (differentiates from rotator cuff tear, where passive ROM is preserved!).

C. Epicondylopathies (Elbow)

• Lateral Epicondylitis ("Tennis Elbow"): Microtrauma and degenerative tendinosis at the common extensor tendon origin, predominantly involving the Extensor Carpi Radialis Brevis (ECRB). Pain is provoked by resisted wrist extension and resisted middle finger extension with elbow in full extension (Cozen test).
• Medial Epicondylitis ("Golfer's Elbow"): Repetitive valgus stress and microtrauma at the common flexor-pronator tendon origin (pronator teres and flexor carpi radialis). Pain is provoked by resisted wrist flexion and resisted forearm pronation.
• Management: Counterforce brace (forearm strap placed 2 cm distal to epicondyle), eccentric physical therapy, topical/oral NSAIDs, avoidance of repetitive gripping. Corticosteroid injections provide short-term relief but increase long-term recurrence rates.

D. De Quervain Tenosynovitis

• Pathophysiology: Stenosing tenosynovitis of the first dorsal extensor compartment of the wrist, containing the Abductor Pollicis Longus (APL) and Extensor Pollicis Brevis (EPB) tendons.
• Risk Factors: Repetitive thumb pinching/wrist ulnar deviation (postpartum mothers lifting infants "baby wrist", smartphone texting, assembly line workers).
• Physical Exam (Finkelstein Test): Have the patient make a fist with the thumb tucked inside the fingers, then passively deviate the wrist in an ulnar direction. Positive if sharp, severe pain is elicited over the radial styloid.
• Management: Thumb spica splint (immobilizing thumb CMC and MCP joints), activity modification, NSAIDs, and localized corticosteroid injection into the first dorsal compartment sheath (up to 80% curative).

E. Carpal Tunnel Syndrome (CTS)

• Pathophysiology: Compression of the Median Nerve within the fibro-osseous carpal tunnel beneath the transverse carpal ligament (flexor retinaculum).
• Etiologies & Risk Factors: Repetitive hand/wrist motion, obesity, pregnancy (fluid retention), hypothyroidism (mucopolysaccharide deposition), diabetes mellitus (increased nerve susceptibility), rheumatoid arthritis (synovial proliferation), amyloidosis, and end-stage renal disease.
• Clinical Manifestations: Burning pain, tingling, and paresthesias in the median nerve distribution: palmar surface of the thumb, index finger, middle finger, and radial half of the ring finger. Symptoms are classically worse at night, frequently awakening the patient from sleep (relieved by "flicking" or shaking the hands: the Flick sign).
• Physical Examination:
  • Phalen Test: Patient holds wrists in maximum unforced flexion for 60 seconds. Positive if paresthesias reproduce in median nerve distribution.
  • Tinel Sign: Lightly percussing the volar aspect of the wrist over the median nerve reproduces tingling/electric shocks.
  • Durkan Carpal Compression Test: Examiner applies direct thumb pressure over the transverse carpal ligament for 30 seconds. Highest sensitivity (~87%) and specificity (~90%) of all provocative clinical maneuvers.
  • Late Physical Finding: Thenar eminence atrophy and weakness of thumb abduction (Abductor Pollicis Brevis); sensation over the thenar eminence itself is preserved because the palmar cutaneous branch of the median nerve passes superficial to the carpal tunnel.
• Diagnostic Confirmation: Electromyography and Nerve Conduction Studies (EMG/NCS) are the diagnostic gold standard, demonstrating slowed median sensory and motor conduction velocity across the carpal tunnel.
• Management:
  1. Mild-to-Moderate CTS: Neutral-position volar wrist splint worn at night (prevents nocturnal wrist flexion), ergonomic workplace modification, and oral NSAIDs.
  2. Persistent Symptoms: Local ultrasound-guided corticosteroid injection into the carpal tunnel.
  3. Severe CTS (Thenar atrophy, persistent sensory loss, or failure of conservative therapy x 6 months): Surgical carpal tunnel decompression release (open or endoscopic division of the transverse carpal ligament).

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3. Spine Disorders & Low Back Pain (LBP)

Low back pain is categorized chronologically as Acute ($<4\text{ weeks}$), Subacute (4–12 weeks), or Chronic ($>12\text{ weeks}$). Over 85% of primary care cases represent non-specific mechanical lumbosacral strain.

+---------------------------------------------------------------------------------------------------+
|                         SPINAL "RED FLAGS" MANDATING IMMEDIATE IMAGING                            |
|                               (THE TUNA FISH MNEMONIC)                                            |
|                                                                                                   |
|   * T - Trauma (Major fall, MVA in young; minor fall/lifting in elderly with osteoporosis)        |
|   * U - Unexplained Weight Loss (> 10 lbs in 6 months -> suggests spinal metastasis)              |
|   * N - Neurologic Deficits / CAUDA EQUINA SYNDROME (Saddle anesthesia, bowel/bladder dysfunction)|
|   * A - Age < 18 or > 50 years with new-onset unremitting back pain                               |
|   * F - Fever, Chills, Diaphoresis (Vertebral osteomyelitis, epidural abscess, discitis)          |
|   * I - Intravenous Drug Use / Immunosuppression (High risk for epidural abscess / infection)     |
|   * S - Steroid Use (Chronic systemic corticosteroid therapy -> severe vertebral fracture risk)   |
|   * H - History of Malignant Neoplasm (Breast, Prostate, Lung, Thyroid, Renal -> Spine mets)      |
+---------------------------------------------------------------------------------------------------+

+---------------------------------------------------------------------------------------------------+
|                             CAUDA EQUINA SYNDROME DIAGNOSTIC CRITERIA                             |
|                                  (NEUROSURGICAL EMERGENCY!)                                       |
|                                                                                                   |
|   * Pathophysiology: Massive central disc herniation or tumor compressing lumbar and sacral       |
|     nerve roots within the spinal canal.                                                          |
|   * Clinical Triad / Cardinal Features:                                                           |
|     1. SADDLE ANESTHESIA (loss of sensation over perineum, buttocks, anus, inner thighs).        |
|     2. BOWEL & BLADDER DYSFUNCTION (urinary retention with overflow incontinence, fecal          |
|        incontinence, loss of anal sphincter tone on digital rectal exam).                         |
|     3. BILATERAL SCIATICA & PROGRESSIVE LOWER EXTREMITY MOTOR WEAKNESS ("foot drop").           |
|   * Clinical Action: STAT Emergency Non-Contrast/Contrast MRI of Lumbar Spine + Immediate          |
|     Neurosurgical / Orthopedic Spine Surgical Decompression within 24 to 48 hours to prevent      |
|     permanent paraplegia and irreversible sphincter incontinence.                                 |
+---------------------------------------------------------------------------------------------------+

Lumbar Radiculopathy (Herniated Nucleus Pulposus / Sciatica)

• Mechanism: Herniation of the nucleus pulposus through a torn annulus fibrosus, posterolaterally compressing the exiting or traversing nerve root.
• Provocative Maneuvers:
  • Straight Leg Raise (SLR / Lasègue Sign): With patient supine, examiner passively elevates the symptomatic straight leg. Positive if sharp, shooting radicular pain radiates below the knee between $30^\circ$ and $70^\circ$ of hip flexion (High sensitivity ~90%).
  • Crossed (Contralateral) Straight Leg Raise: Passively elevating the unaffected leg reproduces radicular pain radiating down the affected symptomatic leg. (High specificity ~90% for disc herniation).

+---------------------------------------------------------------------------------------------------+
|                       LUMBAR RADICULOPATHY NEUROLOGIC LOCALIZATION MATRIX                         |
|                                                                                                   |
|   NERVE ROOT   DISC LEVEL   MOTOR DEFICIT (TEST ACTION)       SENSORY LOSS       REFLEX DEFICIT   |
|   ---------------------------------------------------------------------------------------------   |
|   L4           L3 - L4      Ankle Dorsiflexion / Quadriceps   Medial lower leg,  PATELLAR REFLEX  |
|                             (Difficulty squatting & rising)   Medial malleolus   (Diminished)     |
|                                                                                                   |
|   L5           L4 - L5      Great Toe Dorsiflexion (EHL)      Dorsum of foot,    NONE             |
|                             (Difficulty walking on HEELS)     Web space 1st/2nd  (Normal)         |
|                                                                                                   |
|   S1           L5 - S1      Plantarflexion / Gastrocnemius    Lateral foot,      ACHILLES REFLEX  |
|                             (Difficulty walking on TOES)      Sole, Small toe    (Diminished)     |
+---------------------------------------------------------------------------------------------------+

Lumbar Spinal Stenosis (Neurogenic vs. Vascular Claudication)

Lumbar spinal stenosis is narrowing of the central spinal canal, lateral recesses, or neural foramina by degenerative facet hypertrophy, osteophytes, and ligamentum flavum thickening in older adults.

Cervical Spondylosis, Radiculopathy & Myelopathy

• Cervical Radiculopathy: Most commonly involves C6 (biceps reflex, thumb numbness, wrist extensor weakness) or C7 (triceps reflex, middle finger numbness, triceps/wrist flexor weakness). Spurling Test (Neck Compression Test): Patient extends and rotates neck toward affected side while examiner applies downward axial pressure. Positive if radicular pain shoots down the ipsilateral arm.
• Cervical Spondylotic Myelopathy (CSM): Spinal cord compression in the cervical canal. Clinical hallmarks are Upper Motor Neuron (UMN) signs:
  • Hyperreflexia below level of lesion ($3+$ to $4+$ DTRs, sustained patellar/Achilles clonus).
  • Hoffman Sign: Flicking distal phalanx of middle finger produces involuntary flexion of thumb and index finger.
  • Babinski Sign: Upward extension of great toe with fanning of other digits on plantar stimulation.
  • Gait Ataxia: Wide-based, spastic, clumsy gait ("walking on sponges"), loss of fine motor dexterity in hands (difficulty buttoning shirts, handwriting deterioration).
  • Action: Urgent MRI of cervical spine and immediate spine surgical referral.

Evidence-Based Back Pain Imaging Guidelines (Choosing Wisely)

• For acute, non-specific low back pain without red flag features, diagnostic imaging (X-rays, CT, MRI) is NOT recommended during the first 4 to 6 weeks.
• Imaging does not improve clinical outcomes and leads to unnecessary interventions, patient anxiety, and radiation exposure.
• First-line acute LBP management: Stay active (avoid bed rest >24 hours), apply superficial heat, first-line NSAIDs or short course muscle relaxants (e.g., Cyclobenzaprine for severe spasm), and initiate physical therapy if symptoms persist beyond 2–4 weeks.

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4. Board-Yield Summary & Clinical Pearls

+---------------------------------------------------------------------------------------------------+
|                                 ANCC AGPCNP CLINICAL EXAM PEARLS                                  |
|                                                                                                   |
|   - Osteoarthritis: DIP = Heberden nodes, PIP = Bouchard nodes. Spares MCP and wrists!            |
|     Morning stiffness is <30 minutes. 1st-line knee/hand OA in elderly = Topical Diclofenac.      |
|                                                                                                   |
|   - Carpal Tunnel Syndrome: Durkan compression test has highest sensitivity/specificity.           |
|     Numbness in digits 1, 2, 3, radial 4. Spares thenar skin sensation. Initial tx: Night splint. |
|                                                                                                   |
|   - Frozen Shoulder (Adhesive Capsulitis): Associated with Diabetes. Loss of BOTH active AND      |
|     passive range of motion, especially external rotation. Passive ROM preserved in rotator cuff! |
|                                                                                                   |
|   - Neurogenic vs. Vascular Claudication: If pain is relieved by sitting or leaning forward        |
|     ("shopping cart sign") = Spinal Stenosis. If relieved simply by stopping standing = PAD.      |
|                                                                                                   |
|   - Disc Herniation: L4 = Diminished patellar reflex, medial shin loss, squat weakness.           |
|     L5 = Great toe dorsiflexion weakness (heel walking), dorsal foot loss, NO reflex change.      |
|     S1 = Diminished Achilles reflex, lateral foot loss, toe walking weakness.                     |
|                                                                                                   |
|   - Spinal Red Flags: Acute back pain with new urinary retention / overflow incontinence is       |
|     Cauda Equina Syndrome until proven otherwise -> STAT MRI + Emergency decompression!          |
+---------------------------------------------------------------------------------------------------+