[1] Nippon Med Sch, Inst Gerontol, Kawasaki, Kanagawa, Japan
[2] Nippon Med Sch, Dept Orthoped, Kawasaki, Kanagawa, Japan
[3] Univ Utah, Salt Lake City, UT USA
[4] Tokyo Metropolitan Inst Gerontol, Tokyo, Japan
[5] Tokyo Metropolitan Geriatr Hosp, Tokyo 173, Japan