Shoulder Pain and Disability Index

Abstract

The Shoulder Pain and Disability Index (SPADI) is a widely utilized, patient-reported outcome measure designed to assess the severity of shoulder pain and the resulting functional impairment in individuals with shoulder pathology. This 13-item questionnaire is structured into two primary dimensions: a 5-item pain subscale and an 8-item disability (activity limitation) subscale. The SPADI specifically focuses on the patient’s experience of pain and limitations over the preceding week. Responses are typically captured using either a Visual Analog Scale (VAS) or a Numerical Rating Scale (NRS). A higher composite score on the SPADI indicates greater pain severity and functional limitation.

Keywords

SPADI, shoulder pain, disability index, functional limitation, patient-reported outcome measure, upper extremity, orthopedics, rheumatology, musculoskeletal disorders, rehabilitation.

Authors

Roach KE, Budiman-Mak E, Songsiridej V, Lertratanakul Y (1991); Dutch translation and validation: Elvers JWH, Oostendorp RAB, Sierevelt IN (2003).

Purpose

The primary purpose of the SPADI is to provide a standardized, reliable, and valid metric for quantifying the impact of shoulder disorders on a patient’s daily life. It is intended for use in clinical practice and research to track changes in pain and function over time, particularly following therapeutic interventions such as physical therapy or surgery. The scale is highly sensitive to clinically important changes, making it an essential tool for outcome measurement in shoulder rehabilitation.

It allows clinicians to understand the subjective burden of the condition from the patient’s perspective, moving beyond objective measures of range of motion or strength. By separating the assessment into pain and functional activity domains, the SPADI offers a nuanced view of the patient’s overall health status related to their shoulder condition.

Construct

The SPADI measures the psychological construct of **Health-Related Quality of Life (HRQoL)**, specifically focusing on the dimension of physical function and pain related to the shoulder joint. It is fundamentally a measure of shoulder-specific functional status. The scale operationalizes this construct through two distinct, yet related, subscales:

• Pain Subscale: Assesses the severity of pain experienced during various activities and rest.
• Disability/Activity Limitation Subscale: Measures the difficulty encountered by the patient in performing specific activities of daily living (ADLs) that require upper extremity movement, such as dressing, reaching, or carrying objects.

The construct assumes that shoulder pathology results in a quantifiable decrease in the ability to perform necessary daily tasks, which correlates directly with the self-reported severity of the pain experienced.

Validity

The SPADI demonstrates strong validity across various populations suffering from shoulder pathology.

• Construct Validity: Numerous studies confirm strong correlations between the SPADI and other established shoulder outcome measures, such as the Disabilities of the Arm, Shoulder and Hand (DASH) questionnaire and the Constant-Murley Score. It effectively differentiates between patients with different levels of severity.
• Content Validity: The items included in the SPADI were derived from patient interviews and expert opinion, ensuring that they adequately cover the relevant domains of pain and functional limitation associated with shoulder disorders.
• Responsiveness: The scale exhibits excellent responsiveness, meaning it is highly sensitive to detecting genuine clinical changes over time, particularly following interventions. The minimum clinically important difference (MCID) has been established in several studies, guiding clinicians in determining meaningful recovery.

Reliability

The psychometric properties of the SPADI confirm its reliability as a measurement tool.

• Internal Consistency: The scale consistently demonstrates high internal consistency, typically reflected by Cronbach’s alpha values exceeding 0.90 for the total score and generally above 0.80 for the individual pain and disability subscales. This indicates that the items within each subscale are highly interrelated and measure the same underlying construct.
• Test-Retest Reliability: Studies assessing the stability of the SPADI scores over short periods (when the patient’s condition is stable) consistently report high intraclass correlation coefficients (ICCs), often above 0.90, confirming its excellent test-retest reliability. This ensures that observed changes in scores reflect actual changes in the patient’s condition rather than measurement error.

Factor Analysis

The factor structure of the SPADI has been extensively investigated. Initial factor analysis conducted by the original authors supported a two-factor model corresponding to the intended subscales: Pain and Disability/Functional Limitation.

Subsequent confirmatory factor analysis (CFA) across different languages and populations generally confirms this **two-factor structure**. Although some analyses occasionally suggest a slight overlap between the two domains, the two-subscale model remains the most clinically relevant and psychometrically sound interpretation of the scale, allowing for separate evaluation of pain experience and functional impairment. This distinct factor structure enhances the clinical utility of the SPADI compared to single-score instruments.

Instrument

Test Type: Questionnaire (Patient-Reported Outcome Measure, PROM)

Format: 13 items scored using either a 10-point Visual Analog Scale (VAS) or a 10-point Numerical Rating Scale (NRS), ranging from 0 (no pain/difficulty) to 10 (worst pain/difficulty). The total score is averaged and typically converted to a percentage score (0-100), where 100 represents maximum disability.

Language Available: Original English, Dutch (validated), Spanish, German, French, Chinese, and many others.

Population Group: Clinical populations presenting with various shoulder pathologies, including rotator cuff tears, adhesive capsulitis, impingement syndrome, and osteoarthritis.

Age Group: Children, Adults, and Older Adults (Geriatric population).

Population Details: Applicable to individuals capable of self-reporting their symptoms and functional limitations. The Dutch translation was specifically validated for use in the Netherlands.

Test Methodology: Self-administered questionnaire, usually completed in a clinical waiting room or during an initial assessment. The patient rates the severity of pain and difficulty in performing activities over the past week.

The explanation form for the Dutch version can be downloaded here: Toelichtingsformulier (PDF).

The original Dutch measurement instrument can be downloaded here: Meetinstrument (PDF).

Keywords

Shoulder Pain and Disability Index, functional status, outcome measurement, patient self-report, rotator cuff pathology, VAS, NRS, rehabilitation outcomes.

Authors

Author ORCID Identifier: Not uniformly provided for all original authors; typically requires specific search for each researcher (e.g., Roach KE).

Affiliation Email addresses: Information not provided in the source material; contact details generally correspond to the authors’ institutional affiliations at the time of publication (1991).

Correspondence Address: Information not provided in the source material; typically directed to the primary author, Roach KE.

Permissions & Fee and Test Year

The **Shoulder Pain and Disability Index (SPADI)** was first published in 1991. Given its widespread use in clinical research and practice and its age, the SPADI is generally considered to be a public domain instrument for non-commercial clinical and research use, and no fee is typically required for its administration.

However, researchers intending to create new translations, adaptations, or large-scale commercial implementations are advised to contact the original corresponding author or their affiliated institution (University of Toronto at the time of publication) to ensure compliance with any existing licensing requirements or to verify copyright status for their specific application.

Reference’s

• Roach KE, Budiman-Mak E, Songsiridej V, Lertratanakul Y. Development of a shoulder pain and disability index.

  Arthritis Care Res.

  1991 Dec;4(6):143-9.

• Elvers JWH, Oostendorp RAB, Sierevelt IN. De Nederlandse versie van de Shoulder Pain and Disability Index (SPADI): vertaling, culturele aanpassing en psychometrische evaluatie.

  Ned Tijdschr Fysiother.

  2003;113(1):16-24.

• Williams JW Jr, Holleman DR Jr, Samsa GP, et al. Musculoskeletal disorders: the reliability and validity of the shoulder pain and disability index.

  J Clin Epidemiol.

  1995;48(8):1013-20.

Items of the Shoulder Pain and Disability Index

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

The specific text of the 13 individual scale items was not provided in the source content. The scale is divided into two parts: 5 items assessing **Pain** and 8 items assessing **Disability** (functional limitation).