The effects of gender and pubertal status on generalized joint laxity in young athletes

Our purpose was to examine the effects of pubertal status on generalized joint laxity in a population of mate and female athletes. We hypothesized that females would show higher generalized joint laxity after the onset of puberty white mates would not. This cross-sectional cohort study included 275 female and 143 mate middle school and high school basketball and soccer athletes. Joint laxity was assessed using the Beighton and Horan Joint Mobility Index. BHJMI scores were averaged and female and mate athletes were compared by pubertal stage. Females demonstrated increased joint laxity scores between pre-pubertal and post-pubertal groups (P = 0.042), white mates did not. Pre-pubertal mate and female athletes were not different in cumulative joint laxity scores (female pre-puberty mean = 2.00; mate pre-pubertal mean = 1.66). However, following the onset of puberty females (pubertal mean = 2.96; post-pubertal mean = 3.03) demonstrated a greater joint laxity score compared to mates (pubertal mean = 1.24; post-pubertal mean = 1.30). Gender differences in BHJMI score was found at puberty and post-puberty (P < 0.001). In contrast to mates, females may have greater generalized joint laxity following the onset of puberty. Structural and physiological changes that occur during puberty such as alterations in passive joint restraints, may affect the type, severity and incidence of injuries in the maturing adolescent population. (C) 2007 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.