Seronegative Spondyloarthropathy

Spine

Overview

Seronegative spondyloarthropathy (SpA) is a group of chronic inflammatory conditions affecting the spine and peripheral joints, characterized by absence of rheumatoid factor and the presence of HLA-B27 antigen. These conditions include ankylosing spondylitis, psoriatic arthritis, reactive arthritis, and enteropathic arthritis, presenting with axial and peripheral joint inflammation, enthesitis, and progressive spinal fusion.

Pathophysiology

The pathophysiology involves HLA-B27 genetic predisposition triggering aberrant immune responses to environmental triggers (infections, gut dysbiosis). This leads to TNF-alpha mediated inflammation affecting the entheses (tendon-bone junctions), synovial joints, and spinal facet joints. Progressive inflammation causes ossification of spinal ligaments and disc margins, resulting in syndesmophyte formation and eventual vertebral fusion, restricting spinal mobility and increasing fracture risk.

Patient Education

Early recognition and consistent management with disease-modifying antirheumatic drugs (DMARDs) and TNF inhibitors are crucial to slow spinal fusion and maintain long-term mobility and function.

Typical Presentation

Site

Sacroiliac joints, lumbar spine, thoracic spine, cervical spine, peripheral joints (knees, ankles, shoulders), heels, and entheses

Quality

Deep, inflammatory pain; morning stiffness; intermittent sharp pain at entheseal sites (plantar fasciitis, Achilles tendinopathy)

Intensity

Moderate to severe; typically worse in morning (>30 minutes stiffness), improving with activity; may alternate between rest and activity aggravation

Aggravating

Prolonged rest, inactivity, morning hours, forward spinal flexion (if advanced), certain infections, stress

Relieving

Continued movement and activity, warm showers/baths, NSAIDs, TNF inhibitor therapy, heat application

Associated

Fatigue, systemic inflammation markers, ocular involvement (uveitis in 25-30%), skin manifestations (psoriasis), GI symptoms (inflammatory bowel disease), heel pain, chest wall stiffness, reduced chest expansion, anterior uveitis

Orthopaedic Tests

Schober Test (Modified Schober Test)

Procedure

Patient stands upright; mark the lumbosacral junction (S1) and a point 10 cm above it. Ask patient to bend forward maximally without bending knees. Measure the distance between the two marks.

Positive Finding

An increase of less than 5 cm in the distance between marks (normal is 5–7 cm increase), indicating reduced lumbar flexion

Sensitivity / Specificity

60–70% / 80–90%

Moll & Wright, 1971; supported by multiple reviews including Hegedus et al. systematic reviews on axial SpA assessment

Interpretation

Suggests reduced spinal mobility consistent with axial spondyloarthropathy; a hallmark sign of ankylosing spondylitis and related seronegative spondyloarthropathies

Occiput-to-Wall Distance Test

Procedure

Patient stands with heels against a wall, attempts to place the back of the head against the wall while maintaining neutral cervical posture. Measure the distance from occiput to wall.

Positive Finding

Distance greater than 0 cm (inability to touch head to wall while maintaining upright posture)

Sensitivity / Specificity

null / null

See current literature; widely used clinical screening measure for spinal deformity in axial spondyloarthropathy

Interpretation

Indicates cervical or thoracic hyperkyphosis, commonly seen in advanced ankylosing spondylitis; suggests progressive spinal fusion and postural change

Lateral Lumbar Flexion Test (Side Bending)

Procedure

Patient stands upright with arms at sides; measure the distance from fingertip to floor on one side. Patient then bends laterally as far as tolerable. Repeat bilaterally.

Positive Finding

Reduced lateral flexion bilaterally (less than 20 cm fingertip-to-floor distance) or asymmetric restriction

Sensitivity / Specificity

null / null

See current literature; functional spinal mobility assessment

Interpretation

Reduced lateral spinal mobility consistent with spinal inflammation and/or fusion; supportive of axial spondyloarthropathy diagnosis

Chest Expansion Test

Procedure

Patient stands upright with arms crossed over chest. Measure chest circumference at the level of the 4th intercostal space at full expiration, then at full inspiration.

Positive Finding

Chest expansion of less than 2.5 cm (normal is 5–7 cm), indicating reduced thoracic mobility

Sensitivity / Specificity

55–65% / 75–85%

Moll & Wright, 1971; supported by ASAS (Assessment of Spondyloarthritis International Society) criteria and clinical reviews

Interpretation

Suggests thoracic cage involvement and costovertebral joint restriction, common in advanced ankylosing spondylitis and seronegative spondyloarthropathies

Fabri Test (Sacroiliac Joint Assessment)

Procedure

Patient supine; examiner flexes hip and knee to 90°, then applies internal rotation to the hip. Positive if sacroiliac joint pain is reproduced.

Positive Finding

Reproduction of pain in the sacroiliac joint region

Sensitivity / Specificity

null / null

See current literature; sacroiliac joint stress test variation commonly used in SpA assessment

Interpretation

Suggests sacroiliac joint involvement; early hallmark of seronegative spondyloarthropathy, often precedes axial symptoms

Finger-to-Floor Distance Test

Procedure

Patient stands with feet together and knees extended; measure the distance from fingertip to floor as patient bends forward maximally.

Positive Finding

Increased distance from floor (>20 cm typically indicates limitation), reduced forward flexion range

Sensitivity / Specificity

60–75% / 70–85%

Widely used in spondyloarthritis assessment; supported by ASAS and EULAR guidelines on axial SpA evaluation

Interpretation

Global marker of lumbar and thoracic spinal stiffness; correlates with spinal inflammation and fusion in axial spondyloarthropathy

⚠ Red Flags

  • •Acute anterior uveitis with eye pain and photophobia requiring urgent ophthalmology referral
  • •Severe spinal rigidity with loss of extension in cervical spine (high fracture risk)
  • •Neurological deficit or myelopathy symptoms suggesting spinal cord compression
  • •Acute cauda equina syndrome presentation
  • •Uncontrolled systemic inflammation despite appropriate DMARD therapy
  • •Evidence of cardiac involvement (pericarditis, aortic regurgitation)
  • •Severe anemia or thrombocytopenia suggesting disease complications

⚡ Yellow Flags

  • •High health anxiety or catastrophization about progressive spinal fusion
  • •Poor adherence to DMARD and anti-TNF therapy due to cost, side effects, or health beliefs
  • •Severe functional impairment disproportionate to imaging findings suggesting central sensitization
  • •Depression or anxiety comorbidity affecting pain perception and rehabilitation engagement
  • •Occupational demands incompatible with spinal rigidity requiring vocational counseling
  • •Social isolation or lack of support for managing chronic inflammatory condition
  • •Substance use affecting immune function or medication compliance

Osteopathic Techniques

Region

Sacroiliac joints

Technique

Articulation

Rationale

Gentle articulation maintains sacroiliac joint mobility and proprioceptive feedback; prevents stiffness progression in early disease and provides temporary pain relief through mechanoreceptor stimulation without exacerbating inflammation

Region

Lumbar and thoracic spine

Technique

Soft Tissue

Rationale

Gentle soft tissue techniques reduce paraspinal muscle tension and splinting response that develops secondary to inflammatory stiffness; improves local circulation and reduces muscle guarding without forcing motion

Region

Thoracic spine and rib cage

Technique

Articulation

Rationale

Maintains thoracic extension and chest wall mobility; counters kyphotic deformity and progressive thoracic rigidity while supporting respiratory function and reducing accessory muscle overuse

Region

Cervical spine

Technique

Functional

Rationale

Functional technique supports cervical mobility in early disease and prevents catastrophic loss of extension; avoids HVLA contraindicated in progressive fusion and high fracture risk populations

Region

Peripheral joints and entheses (heels, Achilles, shoulders)

Technique

Soft Tissue

Rationale

Addresses secondary enthesitis and muscle tension around inflamed insertion sites; improves proprioceptive input and reduces pain-related guarding in peripheral manifestations

Region

Whole body and lymphatic system

Technique

Lymphatic

Rationale

Supports lymphatic drainage to reduce systemic inflammatory burden; enhances fluid dynamics and tissue healing capacity, particularly beneficial adjunct to medical anti-inflammatory therapy

Add-On Approaches

Chinese Medicine

TCM approaches addressing underlying 'Bi Syndrome' (obstruction pattern) and Kidney Yang deficiency; acupuncture and moxibustion at affected spinal levels and sacroiliac joints to improve Qi circulation and reduce stagnation; herbal formulas combining anti-inflammatory herbs (turmeric, ginger) with wind-damp clearing agents

Chiropractic

Gentle diversified adjustments to maintain spinal segmental mobility in early disease; emphasis on maintaining extension mobility rather than forcing flexion; avoid aggressive manipulation in advanced fusion; consideration of postural and ergonomic modification to prevent deformity progression

Physiotherapy

Progressive spinal mobility and extension exercises to counter kyphotic tendency; chest wall stretching and breathing exercises for thoracic involvement; aquatic therapy for low-impact strengthening; postural education and ergonomic modification; management of peripheral joint involvement with targeted strengthening

Remedial Massage

Deep tissue massage to paraspinal musculature and affected peripheral areas; focus on reducing secondary myofascial tension and muscle splinting; gentle fascial release techniques; trigger point therapy for muscle guarding around inflamed joints; avoid aggressive techniques that may exacerbate inflammation

Rehabilitation Exercises

Spinal Extension Mobilization (prone or standing)

Range of MotionBeginner

Thoracic Spine Extension Over Foam Roller

StretchingBeginner

Hamstring and Calf Stretching (bilateral)

StretchingBeginner

Chest and Pectoral Stretching (doorway or corner stretch)

StretchingBeginner

Core Stabilization (transverse abdominis engagement with breathing)

StrengtheningIntermediate

Glute Strengthening (bridges, clams, side-lying hip abduction)

StrengtheningIntermediate

Back Extensor Strengthening (prone hip extension, swimming movements)

StrengtheningIntermediate

Postural Awareness and Spinal Alignment Training

PosturalBeginner

Standing Balance and Proprioceptive Training (single leg stance progression)

BalanceIntermediate

Low-Impact Aerobic Activity (swimming, cycling, walking)

CardiovascularBeginner

Cervical Spine Rotation and Lateral Flexion Mobility

Range of MotionBeginner

Hip Flexor Stretching (lunges, kneeling hip flexor stretch)

StretchingIntermediate

Referral Criteria

  • •Suspected diagnosis of seronegative spondyloarthropathy (urgent referral to rheumatology for HLA-B27 testing, imaging, inflammatory markers, and DMARD/TNF inhibitor initiation)
  • •Acute anterior uveitis or ocular symptoms (urgent referral to ophthalmology)
  • •Neurological deficit, myelopathy, or spinal cord compression signs (urgent imaging and neurosurgery consultation)
  • •Evidence of cardiac involvement or pericarditis (referral to cardiology)
  • •Severe functional impairment or progressive spinal deformity despite optimal medical management
  • •Failure to respond to NSAIDs and initial DMARD therapy requiring escalation to TNF inhibitors
  • •Complex peripheral joint involvement requiring specialist joint management
  • •Suspected inflammatory bowel disease with associated SpA (referral to gastroenterology)
  • •Psychological distress, depression, or anxiety significantly impacting rehabilitation (referral to mental health services)
  • •Occupational or vocational limitations requiring occupational health assessment