抄録
Osteoarthritis is one of the universal indicators of physical aging. The factor influence on the aggravation of osteoarthritis is mechanical stress. Therefore, the influence of body size (body mass), or muscular development are suggested, but the positional behaveor (physical movement and posture) is the strongest factor. However, the influence has not been evaluated. Osteoarthritis occurs in macaques, especially in vertebral column. Macaques in captivity showed great aggravation than humans with human age equivalency, and specific differences are suggested, that is in pigtailed macaque it starts to occur earlier and to aggravates more severely than in rhesus or Japanese macaques. Many of these macaque subjects are reared in cages. This makes us suppose that the initiation age and aggravation rate would be influenced by positional behavior habit. The two populations, free-ranging macaque population, Koshima troop; and captive individuals, Primate Research Institute population (PRI), which may differ in positional behavior in quantity and quality, showed much different age change pattern in trunk length (Hamada et al. 2012). We compared the age change in lumbar vertebral osteoarthritis between the two populations. We used lateral-lateral radiographs of lumbar region: 60kv, 20mA, 0.32-0.8sec of exposure in 1m of cube-film distance. The degree of kyphosis, disc space narrowing and osteophytosis were evaluated with score (0¬¬ - 3). We used radiographs taken in 1995 for Koshima popu-lation and 2008-2014 for PRI population.
