The results of 75 shelf operations on 61 patients were followed up over one year.
They were 2 years and 7 months to 15 years and 10 months of age, an average of 8 years and 7 months. The average period of observations was 5 years and one month.
Zinnaka's method was used on most of them.
Results of the operation were evaluated on the functional condition and X-ray findings.
Better functional results were obtained in the case operated at the position of the original acetabulum than in those at the dislocated position.
Good results were obtained in 76per cent of all cases.
Cases operated at less than 7 years of age showed better results than those of over 7 years of age.
The results of roentgenogram were good in 44per cent and poor in 56per cent of the cases.
Poor results were attributed to construction of shelf which were inaccurately placed, absorbed, or fractured.
Cases obtained good results in X-findings were also good in function. Therefore, the shelf should be constructed as close to anatomical shape as possible.