Annie Pouliot-Laforte1, Martin Lemay1, Frank Rauch2, Louis-Nicolas Veilleux3. 1. Research Center, Sainte-Justine UHC, Marie Enfant Rehabilitation Center, Montreal, Quebec, Canada; Department of Physical Activity Sciences, University of Quebec in Montreal, Montreal, Quebec, Canada. 2. Shriners Hospital for Children - Canada, Montreal, Quebec, Canada; Department of Pediatrics, McGill University, Montreal, Quebec, Canada. 3. Shriners Hospital for Children - Canada, Montreal, Quebec, Canada; Department of Kinesiology, University of Montreal, Montreal, Quebec, Canada. Electronic address: lnveilleux@shrinenet.org.
Abstract
OBJECTIVES: To assess static postural control in eyes-open and eyes-closed conditions in individuals with osteogenesis imperfecta (OI) type I as compared with typically developing (TD) individuals and to explore the relation between postural control and lower limb muscle function. DESIGN: Cross-sectional study. SETTING: Outpatient department of a pediatric orthopedic hospital. PARTICIPANTS: A convenience sample (N=38) of individuals with OI type I (n=22; mean age, 13.1y; range, 6-21y) and TD individuals (n=16; mean age, 13.1y; range, 6-20y) was selected. Participants were eligible if they were between 6 and 21 years and if they did not have any fracture or surgery in the lower limb in the 12 months before testing. INTERVENTIONS: Not applicable. MAIN OUTCOMES MEASURES: Postural control was assessed through static balance tests and muscle function through mechanographic tests on a force platform. Selected postural parameters were path length, velocity, 90% confidence ellipse area, and the ellipse's length of the mediolateral and anteroposterior axes. Mechanographic parameters were peak force and peak power as measured using the multiple two-legged hopping and the single two-legged jump test, respectively. RESULTS: Individuals with OI type I had poorer postural control than did TD individuals as indicated by longer and faster displacements and a larger ellipse area. Muscle function was unrelated to postural control in the OI group. Removing visual information resulted in a larger increase in postural control parameters in the OI group than in the TD group. CONCLUSIONS: A proprioceptive deficit could explain poorer postural control in individuals with OI type I.
OBJECTIVES: To assess static postural control in eyes-open and eyes-closed conditions in individuals with osteogenesis imperfecta (OI) type I as compared with typically developing (TD) individuals and to explore the relation between postural control and lower limb muscle function. DESIGN: Cross-sectional study. SETTING:Outpatient department of a pediatric orthopedic hospital. PARTICIPANTS: A convenience sample (N=38) of individuals with OI type I (n=22; mean age, 13.1y; range, 6-21y) and TD individuals (n=16; mean age, 13.1y; range, 6-20y) was selected. Participants were eligible if they were between 6 and 21 years and if they did not have any fracture or surgery in the lower limb in the 12 months before testing. INTERVENTIONS: Not applicable. MAIN OUTCOMES MEASURES: Postural control was assessed through static balance tests and muscle function through mechanographic tests on a force platform. Selected postural parameters were path length, velocity, 90% confidence ellipse area, and the ellipse's length of the mediolateral and anteroposterior axes. Mechanographic parameters were peak force and peak power as measured using the multiple two-legged hopping and the single two-legged jump test, respectively. RESULTS: Individuals with OI type I had poorer postural control than did TD individuals as indicated by longer and faster displacements and a larger ellipse area. Muscle function was unrelated to postural control in the OI group. Removing visual information resulted in a larger increase in postural control parameters in the OI group than in the TD group. CONCLUSIONS: A proprioceptive deficit could explain poorer postural control in individuals with OI type I.