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Musculoskeletal Clinical Reference

Body Mechanics & MSK Pain

Differentiating osteoarthritic pain from biomechanical dysfunction — with targeted interventions, exercises, and bracing guidance.

Differentiating OA Pain vs. Body Mechanics / Biomechanical Pain

Osteoarthritic (OA) Pain

  • Deep, aching, localized to joint line
  • Worse with activity, improves with rest (early) or constant (late)
  • Morning stiffness <30 minutes
  • Bony enlargement, crepitus on exam
  • X-ray: joint space narrowing, osteophytes, sclerosis
  • Pain reproduced with joint compression or passive ROM
  • Bilateral symmetry common in weight-bearing joints
  • Insidious onset over years

Body Mechanics / Biomechanical Pain

  • Often muscular, diffuse, referred or radiating
  • Worse with specific movements or sustained postures
  • Improves with corrected alignment or movement
  • Tender trigger points in muscle or tendon insertions
  • Imaging often negative or incidental findings
  • Pain reproduced with functional movement patterns
  • Often unilateral or asymmetric
  • Responds well to strengthening, stretching, bracing
i These conditions frequently coexist. OA changes the joint mechanics, which then drives compensatory movement patterns that cause secondary muscular pain. Treat both simultaneously.
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Hip, Gait, and Gluteus Medius Dysfunction

Medial foot deviation · Trendelenburg gait · Hip abductor weakness

Medial Foot Deviation (In-Toeing) Midstride

  • Foot rolls inward (pronation) at midstance
  • Driven by weak hip abductors and external rotators
  • Gluteus medius fails to stabilize the pelvis
  • Leads to knee valgus stress and medial knee pain
  • Often bilateral; worse going downstairs
  • Associated with IT band tightness and patellofemoral pain

Trendelenburg Gait

  • Contralateral pelvis drops during single-leg stance
  • Caused by ipsilateral gluteus medius weakness
  • Compensated: trunk leans over the weak side (hip hike)
  • Uncompensated: pelvis drops to opposite side
  • Increases compressive load on lumbar spine
  • Associated with hip OA, post-hip replacement, neurologic conditions

Clinical Signs to Watch For

  • Knee caving inward with squat or step-down
  • Hip drop visible during gait observation
  • Positive Trendelenburg test (single-leg stance 30 sec)
  • Lateral hip and low back pain combination
  • Medial knee pain without joint line tenderness

Gluteus Medius Strengthening Program

Side-Lying Hip Abduction

Lie on side, keep pelvis stacked. Raise top leg 30-45 degrees slowly. 3x15. Add ankle weight as tolerated.

Clamshells

Side-lying with hips at 45 degrees, knees bent. Open top knee like a clamshell while keeping feet together. 3x20. Add resistance band.

Single-Leg Stand with Perturbation

Stand on one leg, hold for 30 seconds. Progress to eyes closed or on foam surface. Builds dynamic hip stability.

Lateral Band Walks

Resistance band just above knees. Semi-squat position. Step side-to-side 10-15 steps each direction. Keep toes forward.

Hip Hitch (Pelvic Drop)

Stand on step on one leg. Lower opposite hip below step level, then hitch it back up. 3x10 each side. Mirrors Trendelenburg correction.

Step-Ups with Control

Step onto low step, focus on keeping knee aligned over second toe. No inward collapse. 3x12. Progress step height.

✓ For patients with significant Trendelenburg gait post-hip replacement, lateral trunk lean is a protective compensation in the short term — do not aggressively correct it until glute med strength is established.
Gluteus Medius Trendelenburg Sign Hip Abductor Strengthening Gait Correction Medial Knee Stress
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Knee Deformity, OA Pain, and Hinged Bracing

Valgus deformity · Varus deformity · Unloader braces · OA management

Valgus Deformity ("Knock Knees")

  • Knees angle inward, feet apart in stance
  • Lateral compartment OA over time
  • Lateral joint line pain and IT band stress
  • Medial collateral ligament laxity common
  • Associated with pes planus and femoral anteversion
  • Bracing: Hinged valgus unloader brace shifts load to medial compartment
  • Lateral wedge insole can supplement

Varus Deformity ("Bow Legs")

  • Knees angle outward, feet together in stance
  • Medial compartment OA (most common pattern)
  • Medial joint line pain, worse with walking
  • Lateral collateral ligament laxity common
  • Worsens with obesity and prolonged standing
  • Bracing: Hinged varus unloader brace shifts load to lateral compartment
  • Medial wedge insole reduces adduction moment

Hinged Unloader Brace Principles

  • Applies a corrective three-point valgus or varus force
  • Offloads the affected compartment by 5-10 degrees
  • Most effective in unicompartmental OA
  • Requires proper fitting — refer to orthotist
  • Hinged design maintains ROM during activity
  • Reduces pain during walking, stairs, and prolonged standing
  • Not a substitute for strengthening — use together

OA Knee Conservative Management

  • Quadriceps strengthening is first-line
  • Low-impact activity: cycling, swimming, walking
  • Weight reduction (each lb lost = 4 lbs less knee force)
  • Topical NSAIDs for localized pain
  • Intra-articular corticosteroid or hyaluronic acid injection
  • Avoid prolonged kneeling, high-impact loading

Strengthening Exercises for Knee OA

  • Straight leg raises (quadriceps without joint load)
  • Terminal knee extensions (TKE) with band
  • Short arc quads (0-40 degrees)
  • Seated leg press (limited range)
  • Hamstring curls for posterior chain balance
  • Hip abductor work to reduce valgus collapse
! Unloader braces are most effective when deformity is mild to moderate. Strengthening programs and assistive devices have been shown to be more effective than medications, and in some cases surgery.
Valgus Unloader Brace Varus Unloader Brace Knee OA Unicompartmental Quadriceps Strengthening
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Lumbar Spine: Lordosis, Posture, and Iliac Crest Pain

Hip tucking for lordosis · Gardener's back · Iliac crest band pain · Posterior chain

Hyperlordosis (Excessive Lumbar Curve)

Anterior pelvic tilt increases lumbar lordosis, compressing facet joints and shortening posterior spinal structures. Associated with hip flexor tightness and weak abdominals.

  • Central low back pain, worse with extension
  • Relief with sitting or lumbar flexion
  • Often combined with protruding abdomen
  • Hip flexors (iliopsoas, rectus femoris) chronically shortened

Hip Tucking (Posterior Pelvic Tilt) Technique

  • Standing: gently contract glutes and draw navel inward
  • Imagine your pelvis is a bowl — tip it backward slightly
  • Do not over-flatten — goal is neutral spine, not flat back
  • Practice standing against a wall: small of back lightly touches wall
  • Apply during all standing and walking activities
  • Cue: "tuck your tailbone slightly downward"

Gardener's Back — Iliac Crest Band Pain

What Is Gardener's Back?

  • Band-like aching pain across the low back at the level of the iliac crests
  • Caused by prolonged forward flexion (gardening, mopping, raking)
  • Thoracolumbar fascia and posterior iliac crest attachments under chronic stretch
  • Quadratus lumborum and erector spinae muscles in sustained strain
  • Worsens with prolonged standing after bending activity
  • Often described as "a tight band" rather than sharp pain

Contributing Factors

  • Bending from the waist instead of the hips
  • Weak core and hip extensors forcing spinal muscles to overwork
  • Poor hip hinge mechanics
  • Prolonged static flexion without rest breaks
  • Tight hamstrings limiting hip flexion, increasing lumbar flex

Interventions

  • Teach proper hip hinge mechanics for all forward bending
  • Rest breaks every 20-30 minutes with extension stretches
  • Lumbar extension: stand and press hands into low back, gently arch backward
  • Heat and gentle massage to QL and thoracolumbar fascia
  • Hamstring stretching to restore hip flexion range
  • Core strengthening (dead bugs, bird dogs, bridges)

Core and Lumbar Stabilization Exercises

Pelvic Tilts

Supine, knees bent. Flatten low back to floor by contracting abs and glutes. Hold 5 seconds, repeat 15-20x. Foundation for neutral spine control.

Glute Bridges

Supine, knees bent. Drive hips upward by squeezing glutes. Hold 2-3 seconds at top. 3x15. Strengthens glutes and reduces lumbar overload.

Bird Dog

On hands and knees. Extend opposite arm and leg simultaneously. Keep spine neutral. 3x10 each side. Builds lumbar stability without compression.

Dead Bug

Supine with arms and knees at 90 degrees. Slowly lower opposite arm and leg toward floor while pressing low back down. 3x8 each side.

Hip Hinge Training

Practice hinging at hips (not waist) using a dowel rod along spine. Keep three contact points (head, thoracic, sacrum). Retrain daily movement patterns.

Hip Flexor Stretch

Kneeling lunge position. Tuck pelvis posteriorly and gently drive hips forward. Hold 30 seconds each side. Relieves anterior pelvic tilt.

! Iliac crest pain that is severe, unilateral, or accompanied by radicular symptoms (numbness, tingling below the knee) requires imaging to rule out stress fracture, sacroiliitis, or nerve entrapment (cluneal nerve).
Hyperlordosis Posterior Pelvic Tilt Hip Hinge Quadratus Lumborum Core Stabilization Thoracolumbar Fascia
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Cervical Spine, Kyphosis, and Shoulder Mechanics

Chronic neck pain · Kyphosis · Trapezius strengthening · Scapular alignment · Shoulder injury prevention

Thoracic Kyphosis and Chronic Neck Pain

  • Forward head posture increases cervical load dramatically
  • Every inch of forward head = +10 lbs on cervical spine
  • Upper trapezius and levator scapulae become overloaded
  • Deep cervical flexors become weak and inhibited
  • Thoracic kyphosis drives the head forward as a compensation
  • Suboccipital muscles develop trigger points causing headaches

Scapular Dyskinesis and Shoulder Injury Risk

  • Protracted (rounded) shoulders narrow the subacromial space
  • Impingement of supraspinatus and biceps tendon
  • Rotator cuff tears more common with chronic scapular malposition
  • Scapula must upwardly rotate 1 degree per 2 degrees of arm elevation
  • Serratus anterior and lower trapezius are key stabilizers
  • Tight pectoralis minor pulls coracoid down and forward

Posture Correction Cues

  • "Ears over shoulders over hips" alignment
  • Chin tuck: gently retract chin to create a "double chin" — holds deep cervical flexors
  • "Squeeze a pencil between your shoulder blades" for scapular retraction
  • Drop and depress shoulders away from ears
  • Open chest, do not hyperextend thoracic spine
  • Practice posture cues every hour during seated work

Trapezius and Cervical Stabilization Program

Chin Tucks

Seated or supine. Gently draw chin straight back (not down). Hold 5 seconds. 3x15. Directly strengthens deep cervical flexors and counters forward head posture.

Scapular Retractions

Seated or standing. Squeeze shoulder blades together and down. Hold 5 seconds. 3x15. Activates middle and lower trapezius. Essential baseline exercise.

Prone Y-T-W Raises

Prone on table. Raise arms in Y, T, and W shapes off table. Targets all three trapezius heads plus rhomboids. 2x10 each position. Low resistance.

Band Pull-Aparts

Hold resistance band at shoulder height, arms extended. Pull band apart horizontally until arms are fully abducted. 3x15. Strengthens posterior shoulder and mid-traps.

Thoracic Extension on Foam Roller

Roller placed horizontally across mid-back. Gently extend over it at multiple levels. Holds 30-60 seconds each level. Mobilizes thoracic kyphosis.

Doorway Chest Stretch

Stand in doorway, forearms on frame at 90 degrees. Step forward until stretch felt across chest. Hold 30 seconds. Releases pectoralis minor tightness.

Scapular Alignment and Shoulder Injury Prevention

Proper Scapular Position

  • Flat against rib cage (not winging)
  • Tilted slightly anterior at rest is normal
  • During arm elevation: upward rotation + posterior tilt + external rotation
  • Serratus anterior must be active to prevent medial border winging
  • Lower trapezius depresses scapula to avoid impingement arc

Key Strengthening Targets

  • Serratus anterior: Wall push-up plus (protraction at end range)
  • Lower trapezius: Prone I/Y raises, seated cable rows low to high
  • Rotator cuff: Side-lying external rotation, ER with band
  • Rhomboids: Rows with retraction emphasis

Red Flags for Shoulder Injury

  • Painful arc between 60-120 degrees of abduction (impingement)
  • Night pain disrupting sleep (rotator cuff tear)
  • Weakness with external rotation (supraspinatus/infraspinatus)
  • Visible scapular winging at rest
  • Sudden loss of strength after acute pain event
✓ For elderly patients with kyphosis and chronic neck pain, start with chin tucks and scapular retractions only — before progressing to resistance. Overdoing upper trap exercises early can worsen cervicogenic headaches.
Forward Head Posture Trapezius Strengthening Scapular Dyskinesis Subacromial Impingement Thoracic Kyphosis Serratus Anterior

Quick Reference: Dysfunction → Cause → Intervention

Problem Primary Cause Key Intervention
Medial foot deviation Weak gluteus medius, hip abductors Clamshells, lateral band walks, step-ups
Trendelenburg gait Ipsilateral glute med weakness Hip hitch, single-leg stance, side-lying abduction
Valgus knee pain Lateral compartment OA + medial laxity Valgus unloader brace + hip abductor strengthening
Varus knee pain Medial compartment OA Varus unloader brace + quads strengthening
Hyperlordosis back pain Anterior pelvic tilt, tight hip flexors Hip tucking, pelvic tilts, hip flexor stretching
Iliac crest band pain QL/thoracolumbar fascia strain, poor hip hinge Hip hinge retraining, core strengthening, extension breaks
Chronic neck pain Forward head posture, thoracic kyphosis Chin tucks, scapular retractions, thoracic mobility
Shoulder impingement Scapular dyskinesis, pec minor tightness Y-T-W raises, serratus activation, doorway stretch