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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Wenzhou Med Univ, Yuying Childrens Hosp, Zhejiang Prov Key Lab Anesthesiol, Wenzhou, Peoples R ChinaWenzhou Med Univ, Yuying Childrens Hosp, Zhejiang Prov Key Lab Anesthesiol, Wenzhou, Peoples R China
Li, Li
Zhang, Yu
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Wenzhou Med Univ, Yuying Childrens Hosp, Key Lab Orthoped, Wenzhou, Peoples R ChinaWenzhou Med Univ, Yuying Childrens Hosp, Zhejiang Prov Key Lab Anesthesiol, Wenzhou, Peoples R China
Zhang, Yu
Lin, Yuan-yuan
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Wenzhou Med Univ, Yuying Childrens Hosp, Key Lab Orthoped, Wenzhou, Peoples R ChinaWenzhou Med Univ, Yuying Childrens Hosp, Zhejiang Prov Key Lab Anesthesiol, Wenzhou, Peoples R China
Lin, Yuan-yuan
Li, Zhen-xing
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Wenzhou Med Univ, Yuying Childrens Hosp, Key Lab Orthoped, Wenzhou, Peoples R ChinaWenzhou Med Univ, Yuying Childrens Hosp, Zhejiang Prov Key Lab Anesthesiol, Wenzhou, Peoples R China
Li, Zhen-xing
Chen, Liang
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Wenzhou Med Univ, Yuying Childrens Hosp, Key Lab Orthoped, Wenzhou, Peoples R ChinaWenzhou Med Univ, Yuying Childrens Hosp, Zhejiang Prov Key Lab Anesthesiol, Wenzhou, Peoples R China
Chen, Liang
Chen, Dao-sen
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Wenzhou Med Univ, Yuying Childrens Hosp, Key Lab Orthoped, Wenzhou, Peoples R ChinaWenzhou Med Univ, Yuying Childrens Hosp, Zhejiang Prov Key Lab Anesthesiol, Wenzhou, Peoples R China
Chen, Dao-sen
Fan, Pei
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Wenzhou Med Univ, Yuying Childrens Hosp, Key Lab Orthoped, Wenzhou, Peoples R China
Wenzhou Med Univ, Yuying Childrens Hosp, Dept Orthopaed, Wenzhou, Peoples R ChinaWenzhou Med Univ, Yuying Childrens Hosp, Zhejiang Prov Key Lab Anesthesiol, Wenzhou, Peoples R China