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Faizan, Ahmad, PhD; Black, Brandon J., BSME; Fay, Brian D., BSME; Heffernan, Christopher D., BME; Ries, Michael D., MD
The Journal of arthroplasty, 2016, January 2016, 2016-Jan, 2016-01-00, 20160101, Volume: 31, Issue: 1Journal Article
Abstract Jumbo acetabular cups are commonly used in revision total hip arthroplasty (THA). A straightforward reaming technique is used which is similar to primary THA. However, jumbo cups may also be associated with hip center elevation, limited screw fixation options, and anterior soft tissue impingement. A partially truncated hemispherical shell was designed with an offset center of rotation, thick superior rim, and beveled anterior and superior rims as an alternative to a conventional jumbo cup. A three dimensional computer simulation was used to assess head center position and safe screw trajectories. Results of this in vitro study indicate that a modified hemispherical implant geometry can reduce head center elevation while permitting favorable screw fixation trajectories into the pelvis in comparison to a conventional jumbo cup.
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