Tuesday, July 23, 2013

Study: MoM hips have high revision rate, incidence of radiolucent lines at 7 years

Healio  July 18, 2013

Study: MoM hips have high revision rate, incidence of radiolucent lines at 7 years

Bjorgul K. Bone Joint J. 2013;doi:10.1302/0301-620X.95B7.31067.


          
Researchers from the United Kingdom compared results of metal-on-metal, metal-on-polyethylene and ceramic-on-polyethylene bearings and found the metal-on-metal bearings were not clinically superior compared to the polyethylene and ceramic bearings at 7 years.
“Our findings reveal no advantage to the [metal-on-metal] MoM bearing and identified a higher revision rate and a greater incidence of radiolucent lines than with the other articulations,” Kristian Bjorgul, MD, PhD, and colleagues wrote in the study abstract. “We recommend that patients with a 28-mm Metasul (Zimmer; Warsaw, Ind.) MoM bearing be followed carefully.”

Bjorgul and colleagues analyzed the results from 123 patients with MoM, 127 patients with metal-on-polyethylene (MoP) and 124 patients with ceramic-on-polyethylene (CoP) bearings, according to the abstract.

In all, the MoM group had four revision for infection and four revisions for aseptic loosening compared to three revisions in the MoP group for infection, dislocation and pain, and one revision in the CoP group for infection. The MoM group also had the lowest Harris Hip Score and highest incidence of radiolucent lines compared to the other groups, according to the abstract

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