Diagnostic accuracy of recently proposed criteria for inflammatory back pain (IBP) in suspected ankylosing spondylitis (AS) and early axial spondyloarthritis (axial SpA)

Status

Active, not recruiting

Phases

Unknown

Study type

Observational

Source

ISRCTN

Registry ID

ISRCTN66488490

Enrollment

550

Registered

2008-08-19

Start date

2008-09-01

Completion date

Unknown

Last updated

2015-01-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Ankylosing spondylitis (AS), early axial spondyloarthritis (axial SpA) Musculoskeletal Diseases Ankylosing spondylitis

Interventions

Experimental group (no medical intervention): The diagnostic accuracy of IBP will be investigated in four private practices and two hospitals by assessing IBP by an independent and blinded observer (

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Patients (aged greater tha 18 years, either sex) with chronic back pain (greater than 3 months) of unknown origin: 1. Referred to the rheumatologist because of suspected AS/axial SpA 2. Seen by primary care physicians/orthopaedists, who agree to subsequently be referred to the rheumatologists

Exclusion criteria

Exclusion criteria: Patients with a definite diagnosis (cause) related to their back pain.

Design outcomes

Primary

Measure	Time frame
Sensitivity, specificity and positive likelihood-ratio (LR+) if two out of four parameters of IBP are present.	—

Secondary

Measure	Time frame
Sensitivity, specificity and positive likelihood-ratio (LR+) if three or four out of four parameters of IBP are present.	—

Countries

Germany

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 4, 2026