PMID: 2112120May 1, 1990Paper

Randomized trial comparing single dose versus fractionated irradiation for prevention of heterotopic bone: a preliminary report

International Journal of Radiation Oncology, Biology, Physics
A A KonskiP Rubin

Abstract

Radiation therapy has been shown to prevent heterotopic bone formation in high risk patients undergoing total hip replacement. A number of doses have been used without a randomized trial comparing one dose regimen against another. A prospective randomized trial was undertaken comparing 10 Gy in 5 fractions versus 8 Gy in 1 fraction. Forty-seven patients have been randomized at the time of this evaluation with 37 patients eligible for analysis. The pre-operative, immediate post-operative and 2 month post-operative radiographs were graded. At the time of this analysis, 17 patients were randomized to the 8 Gy arm with 20 patients in the 10 Gy arm. Patients were treated with limited fields so as to only cover the area at risk for development of heterotopic bone to prevent adverse effects on biologic fixation of uncemented implants. When comparing the pre-operative, operative, and 2 month post-operative radiographs, only four patients (1 patient in the 8 Gy arm and 3 patients in the 10 Gy arm), had an increase in the score. No patient had an increase in score to a clinically significant level, usually grade 3 or 4. These preliminary results appear to show that 8 Gy in a single fraction can be as effective as 10 Gy in 5 fractions in ...Continue Reading

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