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New “cup-in-cup” technique an alternative to traditional cementless THA surgeries
Blumenfeld, TJ. Clin Orthop Relat Res. 2011. doi: 10.1007/s11999-011-2075-8.
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A new “cup-in-cup” technique developed to restore offset in uncemented revision total hip arthroplasty surgeries yields good results, according to a recent study.
Thomas J. Blumenfeld, MD, and his colleagues performed the procedure in seven patients with an average age of 73 years and a minimum 12-month follow-up. Researchers performed eight total hip arthroplasties (THAs) in the study by implanting porous tantalum hemispheric shells into supportive medial host bone. To restore horizontal and vertical offset, a second customized tantalum shell was cemented to the first, the authors wrote.
Researchers used the Paprosky method of classification for identifying preoperative defects: four hips were type IIIA, three were type IIC and one was type IIB. Patients underwent a clinical follow-up and researchers took X-rays postoperatively to determine the level of improvement in the hips.
The results show that abductor strength was improved by one grade in 50% of cases and unchanged in the remaining cases with no evidence of loosening or migration in follow-ups, the authors wrote. Specifically, horizontal offset was increased by an average of 10.5 mm, according to the study, while vertical offset improved at an average of 18.4 mm.
The authors noted long-term follow-up and a larger cohort would be needed in order to determine the durability of the technique.