RESEARCH REPORT: PDF OnlyPilon Julie M. BSc PT; Sadler, Gabrielli T. BSc, PT; Bartlett, Doreen J. PhD, PTPediatric Physical Therapy: Spring 2000 - p 10-15 Free Abstract Many children examined by pediatrie physical therapists present with generalized hypotonia, joint laxity, and motor delay. These signs are assumed to coexist and to be causally related. The objectives of this study were to determine 1) whether a relationship exists between hypotonia and early motor development and 2) whether infants presenting with joint laxity differ from infants without joint laxity in gross motor scores or initial age of ambulation. A secondary analysis was conducted using a longitudinal data set of 180 singletons born at full term; complete data for 141 infants were available for this investigation. Muscle tone and motor development at seven, 10, and 15 months were assessed using the French Angles Factor of the Infant Neurological International Battery and the Alberta Infant Motor Scale, respectively. Motor development was also assessed at 15 months using the Gross Motor Scale of the Peabody Developmental Motor Scales, and joint laxity was assessed at 18 months using the method of Beighton et al. No statistically significant or clinically meaningful relationships between hypotonia and motor development were found. No significant differences in motor development or average age of initial ambulation were found between children with and without joint laxity. The belief that hypotonia and joint laxity are causally related to motor delay was not supported by the results of this investigation. This information assists in the rational evaluation of early neuromotor examinations by giving a new perspective on the role of these variables in motor development and contributes to planning by suggesting that targeting change in muscle tone might not be a rational focus for intervention if the goal is to enhance motor abilities. © 2000 Lippincott Williams & Wilkins, Inc.