Radiological Biological Genetic and Micro-architectural Bone Determinants of Fractures in Men With Low Bone Mineral Density

Overview

Rational: Osteoporosis in men is responsible for one third of fragility fractures. However the definition and especially the determinants of fracture in humans are less well known than in women. Primary Objective: To search radiologic, biochemical, genetic and micro-architecture bone factors associated to fractures in men with low bone density. Study design: case/control study (fracture vs. no fracture) with men selected according to low bone density (Z-score\<-2). Eligibility criteria: Included subjects will be men whose age is ³ 40 and £ 70 years with a Z-score\< -2 at least at one of the 3 measured sites (wrist, lumbar spine, femoral neck). Subjects with secondary osteoporosis will be excluded (corticosteroid treatment, hypogonadism, …) Progress of the study: The recruitment will be over two years. The study will include two periods, an inclusion visit and a period of 3 months to achieve radiological and biological examinations. The subjects will be recruited in the 3 rheumatology departments (LARIBOISIERE, COCHIN). Subjects will be investigated at LARIBOISIERE hospital to perform radiological examinations and biological sampling for laboratory tests within 3 months of enrollment. Evaluation criteria: Biochemistry: dosages of sexual steroids, bone remodeling markers and homocysteine; Genetic: evaluation of polymorphism of candidates genes associated to fragility fractures (collagen type I, homocysteine, LRP5); Radiology: evaluation of bone micro-architecture with a scan of lumbar spine and hip and peripheral micro-scan (XTREME sSCANCO) and bone densitometry at spine, femoral neck and wrist. Duration of participation: there is no follow up Total duration of the study: 2 years and 3 months. Number of subjects: 100 patients with fracture and 100 controls without fracture

Statistical Analysis: Relationship between computed scan parameters at different sites, bone micro-architectural parameters (peripheral scan), biological parameters, genetic markers and the occurrence of fracture will be analyzed initially by univariate analysis (screening process). This will help to reduce the number of variables analyzed at the second stage of analysis (i.e. multivariate analysis). Expected results: This study will help to evaluate radiological, biochemical and genetic determinants of bone quality in men with decreased bone density. It will help to establish a prospective study to evaluate predictive factors of fractures in men.