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Journal of Long-Term Effects of Medical Implants
SJR: 0.145 SNIP: 0.491 CiteScore™: 0.89

ISSN Druckformat: 1050-6934
ISSN Online: 1940-4379

Journal of Long-Term Effects of Medical Implants

DOI: 10.1615/JLongTermEffMedImplants.2019030414
pages 7-9

Failure of Cemented Constrained Acetabular Component at the Bipolar Outer Femoral Head Interface in Revision Hip Arthroplasty

Hosam E. Matar
Centre for Hip Surgery, Wrightington Hospital, Wigan, United Kingdom
Paula Stritch
Surgical Care Practitioner, Department of Trauma and Orthopaedics, Whiston Hospital, Prescot L35 5DR
Nicholas Emms
Consultant Trauma and Orthopaedic Surgeon, Department of Trauma and Orthopaedics, Whiston Hospital, Prescot L35 5DR UK; Consultant and Surgeon for Hip and Knee Arthroplasty, Whiston Hospital, Prescot L35 5DR, United Kingdom


Constrained acetabular components are used as a salvage option for unstable total hip arthroplasties particularly in elderly low demand patients. Their indications include multiple failed revisions with abductor deficiency, neurologic or neuromuscular impairment, recurrent dislocations where the cause of instability cannot be identified despite well-aligned components. Failure of these components occurred due to increased forces across the bone-component interface or failure of the locking mechanisms. We report a unique mode of failure of a constrained cup through dissociation of the outer femoral bipolar femoral head interface in all-poly cemented constrained components 5-years post implantation with a review of the relevant literature.


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