-353. Clinical and radiological survey of the incidence of osteoarthrosis among obese patients. Twenty-five grossly obese males were investigated for evidence of osteoarthrosis. A roentgenological survey of multiple joints obtained from 22 of these patients showed few significant degenerative changes. 6 patients (20 %) had previously incurred traumatic rents in their menisci necessitating meniscectomy. Our results refute previous claims that obesity is a factor in the genesis of osteoarthrosis but do indicate that obese individuals are more predisposed to traumatic injury of the knee.The role of obesity as an aetiological factor in osteoarthrosis (OA) remains controversial. It is thought that excessive weight is a factor in promoting joint degeneration, and invariably it is recommended to the obese patient with OA that he or she lose weight. The logic of this recommendation is irrefutable, but its basis in scientific fact is less clear.Large population studies of patients with OA have shown that a great number are obese (Kellgren and Lawrence, 1958;Kellgren, 1961;Lawrence, Bremmer, and Bier, 1966). A relationship has also been suggested between obesity and the development of OA in specific weight-bearing joints such as knees (Leach, Baumgard, and Broom, 1973) and hips (Law, 1964