The Journal of Bone and Joint Surgery (American). 2009;91:129-133.
doi:10.2106/JBJS.I.00529
© 2009 The Journal of Bone and Joint Surgery, Inc.
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Do Thin Acetabular Shells Increase the Disassociation Risk of Ceramic Liners?

Paul D. Postak, BSc1, Mircea Rosca, MSME1 and A. Seth Greenwald, DPhil(Oxon)1

1 Orthopaedic Research Laboratories, 2310 Superior Avenue East, Cleveland, OH 44114. E-mail address for A.S. Greenwald: seth@orl-inc.com

The first 150 words of the full text of this article appear below.


   Introduction
 
In total hip arthroplasty, the procedural standard for the fixation of metallic acetabular shells is underreaming and impaction. Recently, concerns have arisen regarding achieving and maintaining secure ceramic liners when thin shells are deformed during normal insertion. Failure to achieve an adequate ceramic taper lock has been associated clinically with disassembly1 and liner fracture2. Additionally, this phenomenon has been hypothesized to be a possible cause of articular squeaking, leading to revision in a small number of patients3. This study evaluates the influence of shell deformation on the locking-mechanism integrity of contemporary modular acetabular designs that employ ceramic liners.


   Materials and Methods
 
The Designs
Testing was performed on two commercially available acetabular shell systems that typified contemporary design concepts and on one laboratory control shell. All three shell systems were reliant on a taper lock as the sole means of liner retention. One of the commercial designs, the Equator Plus (Portland Orthopaedics, St. Clair, . . . [Full Text of this Article]


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