The results of shelf operation after Lance-Jinnaka's method for the dysplastic hips were reported on the 55 hips in 52 patients aged over 11 years with an average of 20 years 7 months. Follow-up periods ranged from 10 to 23 years with an avearge of 13 years and 8 months.
Fourteen hips (74%) out of 19 pre-coxarthroses and 25 hips (69%) out of 36 coxarthroses were evaluated by x-ray as excellent and good. While no arthrotic findings occurred in the dysplastic hips, it appeared in 15% of the subluxated and in 68% of the dislocated hips.
Clinical assessment according to the JOA score system revealed that the points were accounted over 90 in the patients with dysplasia and subluxation, being about 10 points higher than those in the patients with dislocated hips.
Lance-Jinnaka's shelf opeartion is, therefore, considered to be promising for the dysplastic hips in the adolescent ex3ept for the dislocated hips.
