Dexa-measured bone density changes over time after intertrochanteric hip fractures.

: The local bone density after an intertrochanteric hip fracture changes over time. In this study, bone density was measured in proximal femur and third lumbar vertebrae in patients treated for an intertrochanteric hip fracture at various periods. There were 60 patients (mean age 71.4 years) and 50 control patients (mean age 62.4 years). Bone density measurements were performed with Dual energy X-ray absorptiometry (DEXA). Bilateral measurements of the greater trochanter, lesser trochanter and femoral diaphysis as well as the third lumbar vertebrae were performed. Each area showed different course of change. The bone density of the greater trochanter and the lesser trochanter in the injured side increased after three months as compared with the control. After three years, the bone density of the greater trochanter decreased. The bone density of the femoral diaphysis and the third vertebrae gradually decreased over time. The authors suggest that bone density changes under the influence of callus formation, bone remodeling, decrease in daily activity, and use of ambulatory aids, etc.