Longitudinal Analysis of Bone Mineral Density after Gastrectomy and Colo-rectal Resection by Dual Energy X-ray Absorptiometry

Taichi Kanamaru, Makoto Usami, Hiroshi Kasahara, Atsunori Iso, Joji Kotani, Kazuya Sakata, Masahiro Yamamoto, Yoichi Saitoh

First Department of Surgery, Kobe University School of Medicine

Thirty-two cases after gastrectomy and 15 cases after colo-rectal resection were studied before and 1 year after surgery to determine the changes in bone mineral density (BMD, g/cm²) by dual energy X-ray absorptiometry. BMD in 1 year after gastrectomy was significantly lower than preoperative BMD (0.93±0.17 vs. 0.89±0.15 in males, 0.68±0.13 vs. 0.65±0.13 in females)(p<0.01) and BMD in males after color-rectal resection was lower than preoperative BMD (0.97±0.20 vs. 0.88±0.16) (p<0.05). The rates of bone loss, expressed as the percent change in preoperative BMD was no difference between males and females, -4.1±6.7 vs. -5.7±5.3 after gastrectomy, and, -2.3±2.9 vs. -0.3±4.0 after colo-rectal resection. The rates of bone loss in patients with after total gastrectomy, Billroth I, Billroth II and color-rectal resection were -9.5±5.7, -1.8±5.5, -4.5±4.8 and -l.7±3.3, respectively. Only the rate of bone loss in patients with after total gastrectomy was greater than that in patients with other three operation methods (p<0.05) . We suggest that bone mineral disorders occur in a year after gastro-intestinal surgery, especially after total gastrectomy and it is necessary to evaluate BMD longitudinally.

Key words
longitudinal analysis of bone mineral density, dual eneray X-ray absorptiometry, gastrointestinal surgery

Reprint requests
Taichi Kanamaru First Department of Surgery, Kobe University School of Medicine
7-5-2 Kusunoki-cho, Chuo-ku, Kobe-city, 650 JAPAN

Accepted
January 10, 1996

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