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Excessive polyethylene wear and acetabular bone defects from standard use of a hooded acetabular insert in total hip arthroplasty.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Gerhardt, Davey M. J. M. Sanders, Rick J. M. de Visser, Enrico Van Susante, Job L. C.
Description	Country affiliation: Netherlands Author Affiliation: Gerhardt DM ( Department of Orthopaedics, Rijnstate Hospital, Postbox 9555, 6800 TA, Arnhem, The Netherlands.)
Abstract	PURPOSE: In total hip arthroplasty (THA) the use of a polyethylene (PE) insert with a hooded rim can be considered to reduce dislocation risks. This benefit has to be balanced against the potential introduction of impingement of the femoral component on this rim. We present a case series of early acetabular revisions for excessive PE wear and acetabular bone defects from overuse of such a hooded rim insert. MATERIAL AND METHODS: Twenty-eight patients with 34 consecutive early acetabular revisions were evaluated on failure mechanism. One type of implant was used in all cases. Standard pelvic radiographs and pre-operative CT scans were used to quantify PE wear, implant positioning and acetabular bone defects. RESULTS: An acetabular revision with impaction grafting was performed in all cases with a mean cup survival of ten years (range 1.3-19.3). No concurrent stem revisions were necessary. Overall implant positioning was adequate with a mean cup inclination of 45° (range 39-57) and anteversion of 25° (range eight to 45). The mean PE wear was 0.24 mm/year (range 0.00-1.17). The mean acetabular bone defect on pelvic CT scans was calculated as 352 mm² (range zero to 1107) and 369 mm² (range zero to 1300) in the coronal and transversal planes, respectively. A hooded acetabular insert was retrieved in all cases and profound PE wear, typically from the posterior hooded rim, was encountered. CONCLUSION: The use of hooded acetabular inserts may be considered to improve implant stability intra-operatively. This case series clearly presents that together with these devices, component impingement with concordant complications such as accelerated PE wear may be introduced. Standard use of these stabilizing inserts should thus be avoided.
File Format	HTM / HTML
ISSN	03412695
e-ISSN	14325195
DOI	10.1007/s00264-014-2333-y
Journal	International Orthopaedics
Issue Number	8
Volume Number	38
Language	English
Publisher	Springer
Publisher Date	2014-08-01
Publisher Place	Germany
Access Restriction	Open
Subject Keyword	Discipline Orthopedics Acetabulum Injuries Arthroplasty, Replacement, Hip Instrumentation Hip Joint Surgery Hip Prosthesis Adverse Effects Polyethylene Prosthesis Design Physiology Observer Variation Prosthesis Failure Range Of Motion, Articular Reoperation Retrospective Studies Tomography, X-ray Computed
Content Type	Text
Resource Type	Case study Article
Subject	Orthopedics and Sports Medicine Surgery

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