title: Exercise-induced rib stress fractures: influence of reduced bone mineral density.
abstract: Exercise-induced rib stress fractures have been reported frequently in elite rowers during the past decade. The etiology of rib stress fractures is unclear, but low bone mineral density (BMD) has been suggested to be a potential risk factor for stress fractures in weight-bearing bones. The present study investigated BMD in seven Danish national team rowers with previous rib stress fracture (RSF) and 7 controls (C) matched for gender, age, height, weight and training experience. Total body scan and specific scans of the lumbar spine (L2-L4), femoral neck and distal radius were performed using a DEXA scanner. The RSF subjects showed significantly lower L2-L4 BMD: RSF: 1.22+/-0.05 g cm(-2) (mean+/-SEM) (median 1.19 g cm(-2), range 1.02-1.37 g cm(-2)) compared to C: 140+/-0.04 g cm(-2) (median 1.41 g cm(-2), range 1.27-1.57 g cm(-2)) (P=0.028). The present results suggest that low bone mineral density may be a potential risk factor for the development of exercise-induced rib stress fractures in elite rowers.
authors.affiliation: Department of Medicine Q, Rheumatology and Geriatrics, Herlev University Hospital, University of Copenhagen, Herlev Ringvej 75, DK-2730 Herlev, Denmark. t.a.vinther@mail.tele.dk
authors.forename: Anders
authors.initials: A
authors.lastname: Vinther
authors.forename: Inge-Lis
authors.initials: IL
authors.lastname: Kanstrup
authors.forename: Erik
authors.initials: E
authors.lastname: Christiansen
authors.forename: Tine
authors.initials: T
authors.lastname: Alkjaer
authors.forename: Benny
authors.initials: B
authors.lastname: Larsson
authors.forename: S Peter
authors.initials: SP
authors.lastname: Magnusson
authors.forename: Per
authors.initials: P
authors.lastname: Aagaard
mesh_terms: D015502:Absorptiometry, Photon; D000328:Adult; D001265:Athletic Injuries / Q000209:etiology*; D015519:Bone Density / Q000502:physiology*; D016022:Case-Control Studies; D015444:Exercise; D005260:Female; D015775:Fractures, Stress / Q000209:etiology*; D006801:Humans; D008297:Male; D012253:Rib Fractures / Q000209:etiology*; D018709:Statistics, Nonparametric; D013851:Thinness