The aim of this observational study is to validate the content of a tailored ICF core set for the management of musculoskeletal conditions in primary care physiotherapy services.

The main question it aims to answer is:

- Are the ICF entities included in the ICF Core Set under evaluation useful from a clinical point of view?

Participants will evaluate the relevance of each ICF entity included in the ICF core set according to their musculoskeletal condition.

Primary care physiotherapy services provide community-based care for musculoskeletal conditions. These conditions are often associated with disability and impact on patients' quality of life. The International Classification of Functioning, Disability and Health (ICF) is the global framework for describing disability. ICF Core Sets are ICF-based tools that facilitate the clinical use of this classification. Some ICF Core Sets are designed to describe the functioning of patients with musculoskeletal problems.

These Core Sets are focused on the acute phase, typical of emergency care, and the post-acute phase, intended for multidisciplinary teams in rehabilitation centers. However, no ICF core set exists for the final stages of these conditions, when the patient has been reintegrated into the community. The development of ICF Core Sets follows a scientific process that integrates the perspectives of researchers, patients, professionals, and the care setting. Therefore, preparatory studies were carried out, taking as a reference the physiotherapy services in primary care, where most of these conditions are treated. A preliminary ICF core set was developed from these studies, the entities of which were agreed upon through a subsequent cross-sectional study involving a group of primary care physiotherapy experts. In order to confirm the usefulness of this ICF core set, a cross-sectional study will be developed to assess the clinical relevance of the ICF entities included in it.

A multicenter cross-sectional observational study will be carried out in primary care physiotherapy services to assess the relevance of various aspects of functioning in patients with musculoskeletal problems. The participants will be people suffering from musculoskeletal problems referred to these services for treatment by a general practitioner. The ICF core set will be used as outcome measure and the relevance of its ICF entities will be assessed by the participants. For this purpose, a 100 mm visual analog scale will be used, where 0 will mean "no problem" and 100 will mean "complete problem". Scores will be converted into ICF qualifiers. The criterion for confirming each ICF entity will be that it represents a problem in at least 5% of the sample. Confirmation of the ICF entities will allow the development of an ICF-based clinical tool for the management of musculoskeletal conditions in primary care physiotherapy services.

Inclusion Criteria:

• 18 years of age or older
• Patients diagnosed with a musculoskeletal condition by a general practitioner
• Patients with adequate knowledge of the Spanish language

Exclusion Criteria:

• Patients referred for a non-musculoskeletal problem
• Patients referred from hospital services

The study population will be the group of patients referred by a general practitioner to physiotherapy services in primary care for the management of musculoskeletal problems.

The authors confirm that the data supporting the findings of this study will be available within the article and/or its supplementary materials.

From the publication of the study, with no time limit.

Access to this data will be conditioned by the type of publication.