• S Schmidl, O Jakobs, D Guenther, C Lausmann, B Schoof, J Beckmann, T Gehrke, and M Gebauer.
• Orthopedic Surgery HELIOS ENDO-Klinik Hamburg, Hamburg, Germany. st.schmidl@hotmail.de.
• Arch Orthop Trauma Surg. 2016 Apr 1; 136 (4): 579-83.

PurposeThis retrospective study was performed to determine the effectiveness of preventing recurrent dislocation following primary cemented Endo-MarkIII/SP2 total hip replacement using a posterior lip augmentation device (PLAD).MethodsBetween January 2003 and Dezember 2006, 27 PLADs were used in the treatment of recurrent hip dislocation in 27 patients who had received a cemented primary total hip arthroplasty using Endo-MarkIII/SP2 (Waldemar LINK, Hamburg, Germany) components. The mean number of dislocations prior to stabilization with this specific device was 2.6 (range 2-4, SD ± 0.4) with a mean time to revision surgery of 10 months (IQR 13). The mean age of the patients at time of revision surgery was 81.5 years (range 70-94, SD ± 6.9). The control group evaluating the clinical outcome using the Harris Hip Score (HHS) also received a cemented primary total hip arthroplasty using the same implants. A retrospective clinical and radiological review was carried out at a mean follow-up of 68.5 months (range 30-103, SD ± 17.7).ResultsOf the 27 patients, 6 had died at the time of the latest review, with the posterior lip augmentation device still in situ and without reported further dislocation after PLAD application. In 2 of the remaining 21 patients recurrent dislocation occurred, thus a subsequent revision of respective implants had to be performed to achieve persistent joint stability. At latest follow-up no deep infection or implant loosening occurred.ConclusionSurgical treatment of recurrent dislocation following primary cemented Endo-MarkIII/SP2 total hip replacement using a posterior lip augmentation device is a safe and effective procedure which can lead to a secondary stabilization of the total hip arthroplasty in about 90 % of the patients.

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