Navigation of the cup in total hip arthroplasty is well analyzed and shows accurate results, reducing cup outliers of Lewinnek's "safe zone." With regard to the combined anteversion of cup and stem, however, a "new" safe zone with a range of 25 degrees to 50 degrees has been published. The aim of this study was to analyze total anteversion (cup and stem) by postoperative 3D computed tomography in isolated cup navigation cases. In 46 patients, the mean combined anteversion was 34.4 degrees (range, 16.3 degrees-57.3 degrees, SD +/- 9.3 degrees) with 10 outliers. The mean cup anteversion was 19.5 degrees (range, 11 degrees-27 degrees, SD +/- 3.7 degrees). Regarding Lewinnek's "safe zone" (cup only), we observed 5 outliers. An improvement of technique of stem implantation or navigation may reduce outliers of combined anteversion.
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Biedermann R, 2005, J BONE JOINT SURG BR, V87B, P762, DOI 10.1302/0301-620X.87B6
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA
DiGioia, AM
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Jaramaz, B
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA
Jaramaz, B
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Plakseychuk, AY
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA
Plakseychuk, AY
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Moody, JE
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA
Moody, JE
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Nikou, C
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA
Nikou, C
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LaBarca, RS
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA
LaBarca, RS
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Levison, TJ
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA
Levison, TJ
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Picard, F
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA
DiGioia, AM
;
Jaramaz, B
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA
Jaramaz, B
;
Plakseychuk, AY
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA
Plakseychuk, AY
;
Moody, JE
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA
Moody, JE
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Nikou, C
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA
Nikou, C
;
LaBarca, RS
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA
LaBarca, RS
;
Levison, TJ
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA
Levison, TJ
;
Picard, F
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Western Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USAWestern Penn Hosp, Inst Comp Assisted Orthopaed Surg, Pittsburgh, PA 15242 USA