High rate of early intraprosthetic dislocations of dual mobility implants: A single surgeon series of primary and revision total hip replacements
Journal of Arthroplasty Jul 02, 2019
Addona JL, et al. - Through a retrospective analysis of a consecutive series of all primary, revision, and conversion total hip arthroplasties procedures conducted by a single surgeon from September 2015 to July 2018 on 527 cases, the researchers intended to determine the high rate of early intraprosthetic dislocations (IPD, a unique failure mode for dual mobility {DM}) of DM implants. Seven DM dislocations were observed. Under conscious sedation, all 7 dislocated DM bearings were reduced in the emergency room setting by an orthopedic resident. A high rate (71%) of early IPD after DM dislocation was recorded. Since dislocations were reduced in the emergency room under conscious sedation, alternative treatment protocols for such patients including administration of regional or general anesthesia in the OR and for the reduction to be conducted under fluoroscopy were apparent. Hence, a potential reduction in the incidence of IPD reporting patients (since IPD does not allow for immediate open reduction and bearing revision) could be observed if dislocated DM components are handled in such a manner. Therefore, providers who investigate patients in the emergency room with dislocated DM bearing should be instructed about this. Also, he should know how to radiographically recognize a DM implant and subsequently implement enhanced closed reduction protocols. Moreover, to limit the discharge of a reduced IPD, constant Orthopedic and EM resident and fellow education would be required in order to recognize post-reduction IPD, in which only the inner bearing could be within the acetabular shell.
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