Gillette gait index as a gait analysis summary measure: Comparison with qualitative visual assessments of overall gait

T. A L Wren, Khanh Patrick Do, Reiko Hara, Frederick J. Dorey, Robert M. Kay, Norman Y. Otsuka

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

BACKGROUND: The Gillette Gait Index (GGI) is a summary measure incorporating 16 clinically important kinematic and temporal parameters. The purpose of this study was to compare GGI scores from computerized gait analysis versus qualitative visual assessments of overall gait to assess the validity of the GGI as a summary score for gait analysis. METHODS: The GGI was calculated for 25 children with cerebral palsy who underwent computerized gait analysis before and 1 year after lower extremity surgery to correct gait problems. Twelve observers reviewed video recordings from the gait analysis to assess the severity of each patient's gait impairment preoperatively and postoperatively and the amount of preoperative to postoperative change. Variability of the video ratings was assessed, and GGI scores were compared with the mean video ratings. RESULTS: The individual ratings showed some variability, with moderate intrarater agreement (weighted κ = 0.49-0.56) and slight to fair interrater agreement (κ = 0.11-0.25). However, the mean scores from all raters were much more consistent, as demonstrated by a highly significant relationship in preoperative to postoperative change viewing the videos separately versus together (r = 0.62; P = 0.0001). GGI scores were correlated with these mean scores preoperatively (r = 0.34; P = 0.003), postoperatively (r = 0.30; P= 0.005), and in preoperative to postoperative change (r = 0.30, P = 0.006 for absolute change; r = 0.22, P = 0.02 for percentage change). CONCLUSIONS: These results support the validity of GGI as a gait analysis summary score and suggest that GGI may be a useful outcome measure in patients undergoing gait analysis. CLINICAL RELEVANCE: Clinicians and researchers should consider using the GGI as a quantitative outcome measure for assessing overall gait.

Original languageEnglish (US)
Pages (from-to)765-768
Number of pages4
JournalJournal of Pediatric Orthopaedics
Volume27
Issue number7
DOIs
StatePublished - Oct 2007
Externally publishedYes

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Gait
Outcome Assessment (Health Care)
Video Recording
Cerebral Palsy
Biomechanical Phenomena
Reproducibility of Results

Keywords

  • Gait analysis
  • Outcome assessment
  • Outcome measure

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Pediatrics, Perinatology, and Child Health
  • Surgery

Cite this

Gillette gait index as a gait analysis summary measure : Comparison with qualitative visual assessments of overall gait. / Wren, T. A L; Do, Khanh Patrick; Hara, Reiko; Dorey, Frederick J.; Kay, Robert M.; Otsuka, Norman Y.

In: Journal of Pediatric Orthopaedics, Vol. 27, No. 7, 10.2007, p. 765-768.

Research output: Contribution to journalArticle

Wren, T. A L ; Do, Khanh Patrick ; Hara, Reiko ; Dorey, Frederick J. ; Kay, Robert M. ; Otsuka, Norman Y. / Gillette gait index as a gait analysis summary measure : Comparison with qualitative visual assessments of overall gait. In: Journal of Pediatric Orthopaedics. 2007 ; Vol. 27, No. 7. pp. 765-768.
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AB - BACKGROUND: The Gillette Gait Index (GGI) is a summary measure incorporating 16 clinically important kinematic and temporal parameters. The purpose of this study was to compare GGI scores from computerized gait analysis versus qualitative visual assessments of overall gait to assess the validity of the GGI as a summary score for gait analysis. METHODS: The GGI was calculated for 25 children with cerebral palsy who underwent computerized gait analysis before and 1 year after lower extremity surgery to correct gait problems. Twelve observers reviewed video recordings from the gait analysis to assess the severity of each patient's gait impairment preoperatively and postoperatively and the amount of preoperative to postoperative change. Variability of the video ratings was assessed, and GGI scores were compared with the mean video ratings. RESULTS: The individual ratings showed some variability, with moderate intrarater agreement (weighted κ = 0.49-0.56) and slight to fair interrater agreement (κ = 0.11-0.25). However, the mean scores from all raters were much more consistent, as demonstrated by a highly significant relationship in preoperative to postoperative change viewing the videos separately versus together (r = 0.62; P = 0.0001). GGI scores were correlated with these mean scores preoperatively (r = 0.34; P = 0.003), postoperatively (r = 0.30; P= 0.005), and in preoperative to postoperative change (r = 0.30, P = 0.006 for absolute change; r = 0.22, P = 0.02 for percentage change). CONCLUSIONS: These results support the validity of GGI as a gait analysis summary score and suggest that GGI may be a useful outcome measure in patients undergoing gait analysis. CLINICAL RELEVANCE: Clinicians and researchers should consider using the GGI as a quantitative outcome measure for assessing overall gait.

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