Responsiveness of specific and generic patient-reported outcome measures in patients with plantar fasciopathy

Marte Heide; Marianne Mørk; Aasne Fenne Hoksrud; Jens Ivar Brox; Cecilie Røe

doi:10.1080/09638288.2023.2267438

Responsiveness of specific and generic patient-reported outcome measures in patients with plantar fasciopathy

Disabil Rehabil. 2023 Oct 19:1-7. doi: 10.1080/09638288.2023.2267438. Online ahead of print.

Authors

Marte Heide^{1

2}, Marianne Mørk^{1

2

3}, Aasne Fenne Hoksrud⁴, Jens Ivar Brox^{1

2}, Cecilie Røe^{1

2}

Affiliations

¹ Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway.
² Department of Physical Medicine and Rehabilitation, Oslo University Hospital, Nydalen, Norway.
³ Research and Communication Unit for Musculoskeletal Health (FORMI), Division of Clinical Neuroscience, Oslo University Hospital, Oslo, Norway.
⁴ Norwegian Olympic and Paralympics Committee and Confederation of Sports, Oslo, Norway.

PMID: 37855657
DOI: 10.1080/09638288.2023.2267438

Abstract

Purpose: To evaluate and compare responsiveness characteristics for the Foot Function Index revised short form (FFI-RS), RAND-12 Health Status Inventory (RAND-12), and Numeric Rating Scale (NRS), in patients with plantar fasciopathy receiving non-surgical treatment.

Materials and methods: This study was conducted on a sub-group of patients from an ongoing randomised controlled trial. One-hundred fifteen patients were included. The patient-reported outcome measures (PROMs) were applied at baseline and after 6 months. Responsiveness was calculated using standardised response mean and area under the receiver operating characteristic (ROC) curve. ROC curves were used to compute the minimal important change (MIC) for the outcome measures.

Results: The region specific FFI-RS had best responsiveness and the NRS at rest had lowest responsiveness.

Conclusion: FFI-RS were marginally more responsive than the other PROMs. Responsiveness and MIC estimates should be regarded as indicative rather than fixed estimates.

Keywords: Plantar fasciopathy; RAND-12 health status inventory; foot function index revised short form; minimal important change; numeric rating scale; patient-reported outcome measures; responsiveness.

Plain language summary

The region-specific Foot Function Index Revised Short Form could, based on responsiveness perspectives, be recommended as an outcome measurement for patients with plantar fasciopathy.Responsiveness and minimal important change estimates are indicative and should be interpreted with caution.