Abstract
We studied the mechanism of development of osteoarthrosis (OA) of the ankle by roentgenological measurement and compared the finding in OA with those of normal ankles.
In this study, there were two groups, an OA group and a control group. The age of the patient in the OA group ranged from 58 to 77 years (mean age 66.6 years). There were 6 males and 2 females, 5 primary and 3 secondary OA of the ankle. In the control group, the age of the subjects ranged from 9 to 81 years (mean age 26.2 years). We evaluated 242 ankles of 242 subjects. The A-P mortice angle, emprical angle, medical malleolar angle, tibial angle, fibular angle, lateral mortice angle, α-angle, and β-angle were measured in both the OA and the control group.
The A-P mortice angle of the OA and control groups were 66.33±6.62 and 88.59±2.20, respectively (p<0.01). The lateral malleolar angles of the OA and control groups were 78.00±5.79 and 82.38±3.14; these values were significantly different (p<0.05). The β-angles of the OA and control groups were 107.22±5.16 and 101.76±5.20, they were also sibnificantly different (p<0.01).
These results showed that the initial site of the OA of ankle was the anteromedical region of the talocrural joints, which facilitated varus deformity of the ankle with time.
