Background THA in patients younger than 30 years presents challenges because of uncertainties regarding the long-term survivorship of prostheses. Alumina-on-alumina bearings, which exhibit little long-term wear, may be a reasonable option but the long-term survivorship is unknown. Questions/Purposes We determined (1) the survival rate of alumina-on-alumina bearings in patients younger than 30 years after a 10-year followup, (2) the incidence of audible hip clicking and squeaking, (3) radiographic evidence of osteolysis, and (4) the effects on pregnancy, childbirth, and career choice. Methods We retrospectively reviewed 62 patients who had 75 THAs with alumina-on-alumina bearings followed more than 10 years (average, 11.5; range, 10-13.5 years). Mean patient age at the time of surgery was 24 years (range, 18-30 years). All operations were performed using the same cementless implant at a single center. We determined survival, presence of osteolysis, and function (Harris hip score, WOMAC).

Thin acetabular medial wall and a small inclination angle of the cup were the correlating factors of medial placement of the cup in patients who underwent an alumina-on-alumina THA. Medial placement did not lead to differences in the clinical or radiological outcomes.

The evaluation of IFGT with MPR CT was shown to be valuable for determining the optimal treatment method.

Results: By radiologic evaluation, all cases showed anatomical reduction and solid union. By Kona's functional evaluation, there are 7 cases with excellent results, 3 cases with good results. The UCLA score was average 33.3 (range 29 to 35) points followed by 6 excellent cases, 4 good cases. As complication, 1 case showed post-operative clavicle shaft fracture and 1 case showed acromial osteolysis on X-rays. We found no complications such as skin irritation, infection, loosening of screws, and plate failure. Conclusion:The Hook plate fixation for distal clavicle fracture is considered effective method for satisfactory reduction and rigid fixation, a lower incidence of nonunion and excellent clinical result.

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