Relationship between phalangeal bone density and risk of vertebral fracture.

Abstract

The aims of our study were to determine the relationship between bone mineral density (BMD) measurements of the phalanges obtained with the accuDEXA and recent vertebral fractures. To determine whether osteoarthritis of the hands affects phalangeal BMD measurements, and to illustrate the conversion of phalangeal BMD measurements to absolute fracture risk estimates for clinical application. The prospective Hawaii Osteoporosis Study began in 1981, and incident vertebral fractures were identified from serial radiographs obtained at approx 2-yr intervals. Vertebral fractures occurring between 1993 and 1994 and 1997 and 1998 were compared to phalangeal BMD measurements obtained in 1997-1998. A total of 199 women participated in this case-control study. The association of the phalangeal BMD measurements with vertebral fractures was examined in age-adjusted, logistic regression models. Results are expressed as odds ratios (ORs) per SD difference in the phalangeal BMD measurements. Osteoarthritis of the hands was graded according to the Kellgren-Lawrence scale. There were 34 incident fractures since the eighth examination in 1993-1994. For vertebral fractures, the OR per SD of phalangeal BMD was 1.5 (1.0-2.1). Phalangeal BMD was not influenced significantly by established osteoarthritis (p = 0.68). Phalangeal BMD measurements obtained with the accuDEXA device relate to recent vertebral fractures and can be used to identify women at high risk of fractures. The phalangeal BMD measurements obtained with this device are not significantly influenced by the presence of osteoarthritis of the hands.