E2 ModerateModerate confidencePEM unclearCross-SectionalPeer-reviewedReviewed
Assessment of systemic joint laxity in the clinical context: Relevance and replicability of the Beighton score in chronic fatigue.
Bernhoff, Gabriella, Huhmar, Helena, Käll, Lina Bunketorp · Journal of back and musculoskeletal rehabilitation · 2022 · DOI
Quick Summary
Some ME/CFS patients have joints that are unusually flexible or loose, which doctors call systemic joint laxity. This study tested whether a simple physical exam called the Beighton score—where doctors check how flexible your joints are—accurately identifies this condition. The researchers found that the Beighton score alone isn't reliable enough on its own and works better when combined with questions about your medical history.
Why It Matters
Joint hypermobility and connective tissue features are recognized comorbidities in ME/CFS that may contribute to symptom severity and functional impairment. Establishing reliable assessment methods is crucial for accurate diagnosis and stratification of ME/CFS phenotypes, which could improve clinical management and research participant selection.
Observed Findings
- The Beighton score showed poor criterion validity against comprehensive clinical assessment (74% agreement, kappa 0.39 at 3-point cutoff; 73% agreement, kappa 0.39-0.45 at 4-5 point cutoffs)
- Interrater reliability between physicians and physiotherapists was moderate when interpreting the score categorically (Spearman's rho 0.66)
- Categorical interpretation (no/some/clear joint laxity) showed better clinical relevance than dichotomous yes/no scoring
- 74-73% overall agreement rate indicates substantial but not high concordance between the Beighton score and clinician assessment of joint laxity
Inferred Conclusions
- The Beighton score alone is an insufficient proxy for systemic joint laxity and should be combined with detailed patient history for reliable assessment
- Categorical interpretation of the Beighton score provides greater clinical utility than dichotomous cutoff approaches
- Interrater reliability is acceptable when using categorical rather than dichotomous scoring, suggesting consistency can be achieved with proper implementation
Remaining Questions
- What specific components of targeted clinical history best supplement the Beighton score for ME/CFS populations?
- Does the performance of the Beighton score differ in ME/CFS patients compared to other patient populations?
What This Study Does Not Prove
This study does not establish whether joint laxity causes ME/CFS symptoms or whether treating joint laxity improves ME/CFS outcomes. It also cannot determine optimal diagnostic criteria for joint laxity in ME/CFS populations, as it only evaluates one screening tool's performance. The findings may not generalize to all ME/CFS patients, as participants were from secondary care settings.
Tags
Symptom:PainFatigue
Method Flag:Weak Case DefinitionNo ControlsExploratory Only
Metadata
- DOI
- 10.3233/BMR-210081
- PMID
- 34957987
- Review status
- Editor reviewed
- Evidence level
- Single-study or moderate support from human research
- Last updated
- 12 April 2026
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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