title: Evaluation of a disease-specific instrument for idiopathic clubfoot outcome.
abstract: In 2001, Roye et al. developed a disease-specific instrument (DSI) to measure outcomes of treatment for clubfoot. We assessed this instrument using a cohort of 62 patients, ages 5 through 12 years (mean, 8.6 years), with idiopathic clubfoot who were treated as infants by various methods. Treatment groups were defined by whether the patient received joint-invasive surgery (posterior or posteromedial release surgery) or joint-sparing treatment only (manipulation and casting with or without tendo-Achilles lengthening or anterior tibial tendon transfer). The DSI scales demonstrated internal consistency reliability of 0.74 to 0.85 using Cronbach's alpha. Higher (better) DSI scores were associated with "excellent" general health ratings and better health-related quality of life; lower DSI score were related to special healthcare needs. Patients treated using joint-sparing techniques only (eg, Ponseti technique) had higher DSI scores than those who had received joint-invasive surgery. DSI scores for patients who had received posterior or posterior medial release surgery were very similar to those reported by Roye et al. in New York for a comparable group of patients. Our findings suggest the DSI is sensitive to differences in treatment technique or underlying severity of disease. These data support the use of the Roye DSI as an outcome measure for idiopathic clubfoot in children.
  
  
  METHODS
  Level III, diagnostic study. See the Guidelines for Authors for a complete description of levels of evidence.
authors.affiliation: Department of Orthopaedic Surgery, University of Iowa Hospitals and Clinics, Iowa City, IA 52242, USA. Frederick-dietz@uiowa.edu
authors.forename: Frederick R
authors.initials: FR
authors.lastname: Dietz
authors.forename: Margaret C
authors.initials: MC
authors.lastname: Tyler
authors.forename: Kecia S
authors.initials: KS
authors.lastname: Leary
authors.forename: Peter C
authors.initials: PC
authors.lastname: Damiano
mesh_terms: D000125:Achilles Tendon / Q000601:surgery; D002370:Casts, Surgical; D002648:Child; D002675:Child, Preschool; D003025:Clubfoot / Q000175:diagnosis* / Q000628:therapy*; D003131:Combined Modality Therapy; D004185:Disability Evaluation; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D026201:Musculoskeletal Manipulations; D019637:Orthopedic Procedures; D011237:Predictive Value of Tests; D011788:Quality of Life; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires; D013709:Tendon Transfer; D016896:Treatment Outcome