Independent Evaluation of a Mechanical Hip Socket Navigation System in Total Hip Arthroplasty

Jennings, Jason M.; Randell, Timmothy R.; Green, Cynthia L.; Zheng, Guoyan; Wellman, Samuel S. (2016). Independent Evaluation of a Mechanical Hip Socket Navigation System in Total Hip Arthroplasty. Journal of arthroplasty, 31(3), pp. 658-661. Elsevier 10.1016/j.arth.2015.09.052

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Background Acetabular cup malpositioning during total hip arthroplasty may lead to impingement, instability, wear-induced osteolysis, and increased rates of revision surgery. The purpose of this study was to independently evaluate the accuracy of acetabular cup orientation using a novel mechanical navigation device. Methods An adjustable, reusable mechanical navigation device was used in a consecutive series of patients. Angles (inclination and anteversion) were measured by 2 independent reviewers with a validated 2-dimensional/3-dimensional matching application using a preoperative computed tomographic scan and a postoperative plain film. Results There were no outliers for inclination or anteversion for errors within 10° of the preoperative plan. There were 6 (12.8%) outliers for inclination and 11 (23.4%) for anteversion for errors within 5° of the preoperative plan. All patients simultaneously met both targets when an outlier was considered 10°, whereas 30 (63.8%) simultaneously met both targets when the criteria was tightened to 5°. The absolute errors for both inclination and anteversion were significantly less than both 5° and 10° (P < .001). Conclusion This device reliably navigates acetabular cup inclination and anteversion individualized for each patient to within 10° of a preoperative plan. Outliers increased when this criteria is tightened to 5° but still appears to be more accurate than conventional acetabular cup component placement. Further research is warranted to assess the clinical impact of reducing outliers using this device.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > Pre-clinic Human Medicine > Institute for Surgical Technology & Biomechanics ISTB [discontinued]

Graduate School:

Graduate School for Cellular and Biomedical Sciences (GCB)

UniBE Contributor:

Zheng, Guoyan


500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health
600 Technology > 620 Engineering








Guoyan Zheng

Date Deposited:

24 May 2017 15:17

Last Modified:

24 May 2017 15:17

Publisher DOI:


PubMed ID:


Uncontrolled Keywords:

acetabular position; hip arthroplasty; mechanical navigation; navigation; outliers




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