Quadratus lumborum asymmetry and L4 pars injury in fast bowlers: a prospective MR study.
Med Sci Sports Exerc
; 39(6): 910-7, 2007 Jun.
Article
en En
| MEDLINE
| ID: mdl-17545879
ABSTRACT
PURPOSE:
This prospective study examined the association between quadratus lumborum (QL) asymmetry and the development of symptomatic pars interarticularis lesions in the lumbar spine of adolescent cricket fast bowlers.METHODS:
Annual magnetic resonance imaging was used to measure QL volume asymmetry and for identifying pars lesions of the lumbar vertebrae in fast bowlers (N=51) and a control group of swimmers (N=18). Manual segmentation of axial images spanning the lumbar spine was performed to calculate percent QL asymmetry relative to the bowling- or throwing- (swimmers) arm side. Asymmetry above 100% indicated a larger QL volume on the bowling- (throwing) arm side.RESULTS:
The mean QL asymmetry in bowlers of 110.5% (SD=12.1%) was significantly different from the 96.6% (SD=5.0%) asymmetry in swimmers (t=6.75, PCONCLUSION:
The strong association between QL asymmetry and the development of symptomatic unilateral L4 pars lesions in adolescent bowlers conceivably reflects a mechanical coupling between the loading milieu generating these injuries and preferential hypertrophy of this paraspinal muscle in response to repetitive activation during fast bowling.
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Banco de datos:
MEDLINE
Asunto principal:
Fracturas por Estrés
/
Músculo Esquelético
/
Vértebras Lumbares
Tipo de estudio:
Diagnostic_studies
/
Etiology_studies
/
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Límite:
Adolescent
/
Humans
/
Male
País como asunto:
Oceania
Idioma:
En
Año:
2007
Tipo del documento:
Article