title: Effects of statins on bone mineral density: a meta-analysis of clinical studies.
abstract: BACKGROUND
  Statins inhibit HMG-CoA reductase, preventing synthesis of mevalonate but also of isoprenoids, which affect osteoclast activity. Amino-bisphosphonates share this effect. In vitro and in vivo, statins show convincing anabolic and anti-resorptive bone effects. However, in a clinical meta-analysis (MA), they did not prevent hip fractures.
  
  
  OBJECTIVE
  Our meta-analysis studied the impact of statins on bone mineral density (BMD) at various sites and compared the effects of lipophilic and more hydrophilic statins.
  
  
  METHODS
  Our PubMed and Embase queries using two keywords (statins, BMD) were updated to October 2006.
  
  
  METHODS
  Two readers independently collected BMDs from studies.
  
  
  RESULTS
  Twenty-one studies, mostly observational (three randomized controlled trials and one pseudo-randomized study), were assessed. Two studies were excluded (no control groups). Three studies could not be analyzed. The sixteen studies analyzed mainly included postmenopausal osteopenic women (2971 patients under statins). Statins significantly increased BMD at total hip (TH) and femoral neck (FN). Effect sizes (ESs) were modest: 0.21 at TH (95% confidence interval [CI]: 0.16-0.25) and 0.20 at FN (CI: 0.08-0.28). Among women, statins acted similarly (ES: 0.20 for TH and 0.18 for FN; CI: 0.14-0.25 and 0.06-0.31 respectively); lipophilic statins (simvastatin, lovastatin) almost entirely caused this effect, at both TH (ES: 0.20; CI: 0.15-0.26) and FN (ES: 0.22; CI: 0.06-0.37).
  
  
  CONCLUSIONS
  Our findings of modest but statistically significant beneficial effects of statins on hip BMD should promote large double-blind randomized controlled trials on their bone effects, in view of their major beneficial cardiovascular effects with excellent safety profile.
authors.affiliation: AP-HP, Laboratoire de Pharmacologie, Hôpital Avicenne, 125 route de Stalingrad, 93009-Bobigny, France. bernard.uzzan@avc.aphp.fr
authors.forename: Bernard
authors.initials: B
authors.lastname: Uzzan
authors.forename: Régis
authors.initials: R
authors.lastname: Cohen
authors.forename: Patrick
authors.initials: P
authors.lastname: Nicolas
authors.forename: Michel
authors.initials: M
authors.lastname: Cucherat
authors.forename: Gérard-Yves
authors.initials: GY
authors.lastname: Perret
mesh_terms: D015519:Bone Density / Q000187:drug effects*; D002986:Clinical Trials as Topic; D005260:Female; D006801:Humans; D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors / Q000627:therapeutic use*; D008875:Middle Aged; D015663:Osteoporosis, Postmenopausal / Q000517:prevention & control; D016896:Treatment Outcome
chemical_list: D019161:Hydroxymethylglutaryl-CoA Reductase Inhibitors