Content » Vol 42, Issue 10

Original report

Heterogeneous assessment of shoulder disorders: Validation of the Standardized Index of Shoulder Function

Arnaud Dupeyron, Anthony Gelis , Philippe Sablayrolles, Philippe-Jean Bousquet, Marc Julia, Christian Herisson, Jacques Pélissier, Philippe Codine
DOI: 10.2340/16501977-0627


Objective: Although 40 assessment tools are described in the literature, very few of them have been correctly validated. The Standardized Index of Shoulder Function (FI2S) encompasses pain, mobility, strength and function. The aim of this work is to describe the FI2S and to study its construct validity, reliability and responsiveness to change.
Patients: Fifty-nine patients with non-surgical (rotator cuff lesions, frozen shoulders, osteoarthritis) or post-surgical (acromioplasty, repairs of rotator cuff tears, arthroplasty) shoulder disorders were included.
Methods: The FI2S was compared with the Disabilities of the Arm, Shoulder and Hand questionnaire (DASH), with the Constant-Murley Score (CMS), and with a visual analogue scale for pain.
Results: Inter-test reliability and inter-rater reliability are excellent, with intra-class correlation coefficient of 0. 93 (0. 88–0. 96) and 0. 94 (0. 90–0. 96), respectively. Under a convergent
hypothesis, the Spearman’s correlation coefficients with the CMS and DASH score are 0. 91 (p < 0. 0001) and –0. 64 (p < 0. 0001), respectively. Correlations between the FI2S and the CMS are excellent for mobility and strength, but
moderate for pain and functional capacities. Under a divergent hypothesis, no correlation is observed between the FI2S total score and age. Responsiveness to change is excellent.
Conclusion: The FI2S appears to be a proper assessment tool for pain, mobility, strength and function in shoulder disorders, easy to administer and of good metric value.

Lay Abstract


Do you want to comment on this paper? The comments will show up here and if appropriate the comments will also separately be forwarded to the authors. You need to login/create an account to comment on articles. Click here to login/create an account.