ArticleBMC musculoskeletal disorders2026
German translation and initial measurement properties of the Q-TFA in transfemoral bone-anchored prosthesis users.
Article in BMC musculoskeletal disorders, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundTo translate and cross-culturally adapt the Questionnaire for Persons with a Transfemoral Amputation (Q-TFA) into German and evaluate initial measurement properties in adults with unilateral transfemoral amputation using a transcutaneous bone-anchored prosthesis.
methodsSixty-one participants completed the German Q-TFA and comparator patient-reported outcome measures at baseline and after 12-15 days. The original four-score Q-TFA structure was retained: Prosthetic Use, Prosthetic Mobility, Problem, and Global scores. Test-retest reliability, measurement error, internal consistency of the Problem Score, floor and ceiling effects, and hypothesis-based construct validity were assessed.
resultsThe 61 participants (42 male, 19 female; mean age 56.2 ± 11.7 years) used bone-anchored transfemoral prostheses; trauma was the etiology in 74%. Baseline mean ± SD scores were 82.1 ± 29.2 for Prosthetic Use, 52.0 ± 10.0 for Prosthetic Mobility, 21.3 ± 16.6 for Problems, and 65.4 ± 18.6 for Global. ICCs ranged from 0.960 to 1.000. The Problem Score had high internal consistency (Cronbach's α = 0.955), no score showed a substantial floor or ceiling effect, and all six nonredundant construct-validity hypotheses were confirmed.
conclusionsThe German Q-TFA, scored according to its original four-score structure, showed high short-interval test-retest reliability and supportive construct-validity findings in this selected bone-anchored prosthesis cohort. Structural validity, patient-based content validity, responsiveness, and interpretability remain to be established before the instrument is used to infer clinically important change or for formal cross-center benchmarking.
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