Turkish Adaptation Study of the Generic Functional Index

Not yet recruiting

• Conditions: Musculoskeletal Diseases

• Registration Number: NCT07004478
• Lead Sponsor: Istanbul Bilgi University

Brief Summary

The Generic Functional Index is a scale developed to assess the general functional status of individuals. This study aims to evaluate the validity and reliability of the Turkish version of the Generic Functional Index. The adaptation process was designed to follow a standardized translation protocol, including forward translation, expert committee review, back-translation, pilot testing, and psychometric analyses. Data will be collected from individuals with musculoskeletal problems. Psychometric testing will include test-retest reliability, internal consistency, and construct validity analyses.

The main hypotheses of this study are as follows:

1. The Turkish version of the Generic Functional Index will demonstrate high test-retest reliability when administered to individuals with musculoskeletal disorders.

2. The scores of the Turkish version of the Generic Functional Index will show a significant positive correlation with the scores of the Functional Independence Measure in individuals with musculoskeletal disorders.

Detailed Description

Functional assessment is a fundamental component in evaluating the impact of health conditions on individuals' daily lives and in guiding rehabilitation strategies. The Generic Functional Index is a multidimensional instrument developed to assess overall functional status by capturing the effects of a person's problem on their daily activities, mobility, pain, and self-care performance. There is currently no validated Turkish version of the Generic Functional Index available for use in musculoskeletal populations.

This study aims to translate and culturally adapt the Generic Functional Index into Turkish and to investigate its psychometric properties in individuals with musculoskeletal disorders. The adaptation will follow an internationally recognized translation methodology, including forward translation, synthesis, back-translation, expert committee review, and pre-testing. Psychometric evaluation will involve data collection from individuals with musculoskeletal conditions, with analyses focusing on internal consistency, test-retest reliability, and construct validity.

Construct validity will be examined by analyzing the relationship between the Turkish Generic Functional Index and the Functional Independence Measure, which is a widely used tool for assessing independence in daily living activities. A strong correlation between these tools will support the convergent validity of the Turkish Generic Functional Index.

This study is significant because a valid and reliable Turkish version of the Generic Functional Index will provide clinicians and researchers with a standardized tool for evaluating functional limitations in Turkish-speaking populations with musculoskeletal disorders. It will also contribute to the international applicability of the Generic Functional Indexby expanding its use to different cultural and linguistic contexts.

Study Timeline

• Status Verified: 2025-05
• Study First Submitted: 2025-05-27
• Study First Submitted QC: 2025-05-27
• Last Update Submitted: 2025-05-27
• Study First Posted: 2025-06-04
• Last Update Posted: 2025-06-04
• Study Start: 2025-07-01
• Primary Completion: 2025-09-01
• Study Completion: 2025-12-01

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 200

Inclusion Criteria

• Being 18 years of age or older,
• Turkish literacy,
• Cognitive competence,
• Having a musculoskeletal disorder

Exclusion Criteria

• Those with acute functional impairment
• Those with cognitive impairment, or
• Those with a mental or physical condition that would prevent them from understanding the scale.

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
The Turkish Version of Generic Functional Index	T0 and T1 (Baseline and after 1 week after)	This index is designed for use across a wide range of musculoskeletal and functional conditions and comprises four parts: Part 1 - Global Status: Patients rate their overall post-injury status on a 0-10 scale, multiplied by 10 to yield a percentage (range: 0-100).; Part 2 - Duties and Pain: Assesses functional duties and pain level, each on a 0-10 scale converted to percentages (range: 0-100 each).; Part 3 - Functional Limitations: A 10-item checklist (mobility, dressing, sleep, etc.), with full or half points; total score (0-10) is multiplied by 10 for a 100-point scale.; Part 4 - Patient-Specific Index: Patients rate up to 5 activities on a 0-10 scale (0 = worst, 10 = best); total is doubled to yield a percentage (range: 0-100).; Lower scores indicate greater disability; higher scores reflect better function.
Functional Independence Measure	Baseline	Functional Independence Measure will be used to examine the construct validity of the Turkish version of the Generic Functional Index. The Functional Independence Measure is a widely accepted and validated tool that assesses functional independence in daily activities through 18 items across motor and cognitive domains, scored on a 7-point scale. Since both instruments aim to evaluate functional status, a significant correlation between Functional Independence Measure and Generic Functional Index scores would support the convergent validity of the Generic Functional Index. Functional Independence Measure's established use in rehabilitation and its robust psychometric properties make it an appropriate reference measure for this validation study. Total Functional Independence Measure scores range from 18 to 126, where lower scores indicate complete dependence and higher scores reflect complete functional independence.