SPADI - Quick Summary

SPADI has been evaluated in both primary care patients with non-specific shoulder pain and specific conditions such as frozen shoulder. Study populations have typically included middle-aged adults (approximately 45–60 years), though results vary depending on condition and clinical setting.

SPADI structure, scoring, and interpretation

SPADI consists of 13 items referring to the past week, divided into two subdomains:

• Pain (5 items)
• Disability (8 items)

Note. Although SPADI is commonly reported using separate pain and disability subscales, some studies show overlap between these constructs, suggesting pain and function are closely related. hence caution advised when interpreting the subdomain scores.

The original version used a visual analogue scale (VAS); later studies commonly employ a numeric rating scale (NRS, 0–10), which is also implemented in Physitrack.

Scores are converted to a 0–100 total score:

• 0 = no pain or disability
• 100 = worst possible pain and disability

Psychometric properties

SPADI has shown generally good to excellent reliability, validity, and responsiveness across multiple shoulder pain populations. However, the quality of evidence varies between studies and language versions, which should be considered when interpreting results. Internal consistency is consistently high, indicating stable and coherent item responses. Construct validity is supported by strong correlations with other shoulder-specific outcome measures.

Floor and ceiling effects are generally low, though they may vary depending on the population and symptom severity. SPADI is responsive to clinical change over time, making it suitable for monitoring progress. As a result, variations between language versions, population samples, and study methods warrant cautious interpretation when comparing results across studies.

Interpreting SPADI scores in practice

Evidence for minimal detectable change (MDC) and clinically important change (MIC/MCID) varies between populations:

• In frozen shoulder populations, the smallest detectable change has been reported at approximately 6 points per subscale, suggesting the minimum change likely to exceed measurement error (SEM ≈ 2.3 per subscale).
• In primary care shoulder pain, larger improvements—around 15–20 points—are typically needed for patients to perceive meaningful change.

Respondent burden

SPADI takes approximately 2–3 minutes to complete and is generally considered easy to understand and fill out. When using the NRS version, Physitrack automatically calculates total and subdomain scores, which can also be verified manually if needed.

Language versions

SPADI has been translated into more than 20 languages, with the strongest psychometric evidence currently available for the Danish and Dutch versions. At present, Physitrack supports SPADI in English and Dutch. If SPADI is not available in a patient’s preferred language, healthcare professionals can independently add and use alternative outcome measures within the platform.

Disclaimer

This blog post is intended as an educational overview for clinicians. It does not replace formal training, primary research literature, or clinical judgment. Although the content is based on peer‑reviewed sources, it is not continuously updated, and accuracy cannot be guaranteed. Always verify reference links and consult original research for clinical decision‑making.

References

Thoomes-de Graaf M, Scholten-Peeters GG, Schellingerhout JM, et al. Evaluation of measurement properties of self-administered PROMs aimed at patients with non-specific shoulder pain and "activity limitations": a systematic review. Qual Life Res. 2016;25(9):2141–2160. doi:10.1007/s11136-016-1277-7

MacDermid JC, Solomon P, Prkachin K. The Shoulder Pain and Disability Index demonstrates factor, construct and longitudinal validity. BMC Musculoskelet Disord. 2006;7:12. doi:10.1186/1471-2474-7-12

Roach KE, Budiman-Mak E, Songsiridej N, Lertratanakul Y. Development of a shoulder pain and disability index. Arthritis Care Res. 1991;4(4):143–149.

Venturin D, Giannotta G, Pellicciari L, et al. Reliability and validity of the Shoulder Pain and Disability Index in a sample of patients with frozen shoulder. BMC Musculoskelet Disord. 2023;24(1):212. doi:10.1186/s12891-023-06268-2

Paul A, Lewis M, Shadforth MF, Croft PR, Van Der Windt DA, Hay EM. A comparison of four shoulder-specific questionnaires in primary care. Ann Rheum Dis. 2004;63(10):1293–1299. doi:10.1136/ard.2003.012088

KC S, Sharma S, Ginn KA, Reed D. Measurement properties of translated versions of the Shoulder Pain and Disability Index: A systematic review. Clinical Rehabilitation. 2020;35(3):410-422. doi:10.1177/0269215520963199

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