Dianne Russell

Development and reliability of a system to classify gross motor function in children with cerebral palsy

To address the need for a standardized system to classify the gross motor function of children with cerebral palsy, the authors developed a five‐level classification system analogous to the staging and grading systems used in medicine. Nominal group process and Delphi survey consensus methods were used to examine content validity and revise the classification system until consensus among 48 experts (physical therapists, occupational therapists, and developmental pediatricians with expertise in cerebral palsy) was achieved. Interrater reliability (k) was 0.55 for children less than 2 years of age and 0.75 for children 2 to 12 years of age. The classification system has application for clinical practice, research, teaching, and administration.

THE GROSS MOTOR FUNCTION MEASURE: A MEANS TO EVALUATE THE EFFECTS OF PHYSICAL THERAPY

This paper reports the results of a study to validate a measure of gross motor function in detecting change in the motor function of disabled children. Physiotherapists used this instrument to assess 111 patients with cerebral palsy, 25 with head injury and 34 non‐disabled preschool children on two occasions, the second after an interval of four to six months. Parents and therapists independently rated the childrens function within two weeks of each assessment, and a sample of paired assessments was videotaped for ‘blind’ evaluation by therapists. Correlations between scores for change on this measure and the judgments of change by parents, therapists and ‘blind’ evaluators supported the hypothesis that the instrument would be responsive to both negative and positive changes.

Stability of the Gross Motor Function Classification System

The aim of this study was to assess the stability of the Gross Motor Function Classification System (GMFCS) by examining whether children with cerebral palsy (CP) remain in the same level over time. Participants were 610 children with CP (342 males, 268 females; mean age 6y 9mo [SD 2y 10mo]), range 16mo-13y). Children were assessed 2 to 7 times (mean 4.3) at 6-month (children <6y old) or 12-month(children >or=6y old) intervals. Seventy-three per cent of children remained in the same level for all ratings. The weighted kappa coefficient between the first and last ratings was 0.84 for children less than 6 years old and 0.89 for children at least 6 years old, indicating excellent chance-corrected agreement. Children initially classified in Levels I and V were least likely to be reclassified. There was a tendency for children younger than 6 years who were reclassified to be done so to a lower level of ability. The results provide evidence of stability of the GMFCS.

Development of the Gross Motor Function Classification System for cerebral palsy

The Gross Motor Function Classification System (GMFCS) for cerebral palsy has been widely used internationally for clinical, research, and administrative purposes. This paper recounts the ideas and work behind the creation of the GMFCS, reports on the lessons learned, and identifies some philosophical challenges inherent in trying to develop an ordered, valid, and consistent system to describe function in children and adolescents with developmental differences. It is hoped that these ideas will be useful to others who choose to expand the field with additional systems in other areas of childhood neurodisability.

Stability and Decline in Gross Motor Function among Children and Youth with Cerebral Palsy Aged 2 to 21 Years

This paper reports the construction of gross motor development curves for children and youth with cerebral palsy (CP) in order to assess whether function is lost during adolescence. We followed children previously enrolled in a prospective longitudinal cohort study for an additional 4 years, as they entered adolescence and young adulthood. The resulting longitudinal dataset comprised 3455 observations of 657 children with CP (369 males, 288 females), assessed up to 10 times, at ages ranging from 16 months to 21 years. Motor function was assessed using the 66‐item Gross Motor Function Measure (GMFM‐66). Participants were classified using the Gross Motor Function Classification System (GMFCS). We assessed the loss of function in adolescence by contrasting a model of function that assumes no loss with a model that allows for a peak and subsequent decline. We found no evidence of functional decline, on average, for children in GMFCS Levels I and II. However, in Levels III, IV, and V, average GMFM‐66 was estimated to peak at ages 7 years 11 months, 6 years 11 months, and 6 years 11 months respectively, before declining by 4.7, 7.8, and 6.4 GMFM‐66 points, in Levels III, IV, and V respectively, as these adolescents became young adults. We show that these declines are clinically significant.

Health status of school-aged children with cerebral palsy: information from a population-based sample.

In this study parents’systematic accounts of the health status of 408 school‐aged children with cerebral palsy (CP) are reported (221 males, 187 females; mean age 8 years 5 months, SD 1 year 11 months; range 5 to 13 years), as are relations between severity of functional motor impairment and eight functional health status domains. Data were collected as part of a longitudinal study of the motor development of a population‐based, stratified, random sample of children with CP from across Ontario, Canada. The Gross Motor Function Classification System (GMFCS) was used to classify severity of CP and functional health status was described with the eight‐level Health Utilities Index ‐ Mark 3. Rates of functional limitations in Mobility, Dexterity, Speech, and Vision were statistically significantly associated with GMFCS levels (all p<0.01), with correlation values (tau‐b) of 0.82,0.58,0.46, and 0.36, respectively. Functional limitations in hearing (tau‐b=0.16; p=0.04) and cognition (tau‐b=0.27;p<0.01) were both statistically significantly associated with GMFCS levels, though correlations were low. Neither emotion (tau‐b=0.03;p=0.24) nor pain (tau‐b=0.07;p=0.37) was associated with degree of functional limitation as described by the GMFCS. Clinical and epidemiological implications of findings are discussed.

Focus on function: a cluster, randomized controlled trial comparing child‐ versus context‐focused intervention for young children with cerebral palsy

Aim  This study evaluated the efficacy of a child‐focused versus context‐focused intervention in improving performance of functional tasks and mobility in young children with cerebral palsy.

Rasch analysis of the gross Motor Function Measure: Validating the assumptions of the Rasch model to create an interval-level Measure

OBJECTIVES To describe the Rasch analysis of the Gross Motor Function Measure (GMFM-88) and to demonstrate how the assumptions of unidimensionality, sample-free measurement, and test-free measurement were validated to create an interval level measure. DESIGN Cross-sectional and longitudinal (12-mo) data from a prospective study of motor development in children with cerebral palsy (CP) were used for the analysis. SETTING Motor assessments were completed at 18 childrens ambulatory rehabilitation centers in Ontario, Canada, by pediatric physical therapists trained in the use of the GMFM-88. PARTICIPANTS The first 537 of 682 children enrolled into a longitudinal study of motor development in children with CP. Children had a mean age of 6.43+/-2.75 years (range, 11mo-12y) with varying types and severity of CP. INTERVENTIONS Not applicable. MAIN OUTCOME MEASURE The GMFM-88. RESULTS The Rasch analysis, in conjunction with clinical decisions, identified 66 items from the GMFM-88 that formed a unidimensional measure (GMFM-66). Assumptions of sample-free and test-free measurement were confirmed, and a user-friendly scoring program was developed. CONCLUSIONS The GMFM-66 is an interval-level measure of gross motor function for children with CP; it should improve the scoring, interpretation, and overall clinical and research utility over the original GMFM.

Neurodevelopmental Therapy and Upper-Extremity Inhibitive Casting for Children with Cerebral Palsy

The purpose of this research was to study the effect of intensive neurodevelopmental therapy (NDT) and upper‐extremity inhibitive casting, separately or in combination, on hand function, quality of upper‐extremity movement and range of motion of 73 children with spastic cerebral palsy aged 18 months to eight years. There was no significant difference between intensive or regular therapy and casting or no casting for hand function, between intensive and regular NDT, or between intensive NDT plus casting and the other groups for quality of movement and range of motion. Casting led to increased quality of movement and wrist extension after six months. Casting with NDT improved the quality of upper‐extremity movement and range of motion. There appear to be no immediate benefits from intensive therapy alone.

Quality of life among adolescents with cerebral palsy: what does the literature tell us?

This review describes trends in quality of life (QOL) and health‐related quality of life (HRQOL) among adolescents with cerebral palsy (CP). Twenty original articles were identified by a structured search of multiple databases and grouped by design. Categories included descriptive cross‐sectional studies (n=8), measurement validation studies (n=9), and exploratory qualitative studies (n=3). Several trends were apparent. First, individuals with CP are reported to have decreased QOL and HRQOL compared with a normative population in some but not all areas of well‐being. Second, functional status measures such as the Gross Motor Function Classification System are reliable indicators of variations in physical function, but do not correlate consistently with psychosocial well‐being. Third, although adolescents with CP have different life issues than adults or children, limited research on factors associated with QOL and HRQOL has been described for this age range. We recommend that clinicians and researchers interested in assessing well‐being among adolescents with CP include participants from across the spectrum of motor impairment, allow adolescents to self‐report whenever possible, and assess adolescents independently, rather than including them with individuals from other age groups or clinical populations.