Scapula and hip joint function in baseball players
Baseball players are exposed to large amounts of repetitive throwing - dysfunctional biomechanics have been linked to increased injury rates. The hip and shoulder are important links in the kinetic chain of throwing, however, knowledge about the development of adaptive changes (and thus asymmetry) in these joints is scarce.
108 preadolescent and adolescent baseball players were allocated to two groups based on age range (7-12 and 13-18 years, respectively) and completed hip ROM and strength testing, the single-legged squat and measurements for dyskinesis and coracoid distance (measured supine in cm from the table).
In the adolescent group, the prevalence of scapular dyskinesis was significantly higher than in the preadolescent group. The coracoid distance was increased in the throwing shoulder in both groups, regardless of the presence of scapular dyskinesis – the adolescent group showing higher values. Performance on the single-legged squat was poor, in fact no player below the age of 13 could perform a proper single-legged squat. Hip ROM values were lower in the adolescent group, whereas hip abduction strength was higher.
> From: Beckett et al., Am J Sports Med 42 (2015) 2502-2509. All rights reserved to The Author(s). Click here for the Pubmed summary.