| Reliability of cup position in navigated THA in the lateral decubitus position using the 'flip technique' | |
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MedLine Citation:
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PMID: 22135017 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Malpositioning of the acetabular component in total hip arthroplasty (THA) increases the risk of dislocation, reduces the range of motion and may contribute to bearing surface wear. During computer assisted navigation, the anterior pelvic plane is registered intraoperatively by percutaneous palpation, but this may be unreliable. The aim of our study was to evaluate the reliability of imageless navigation in acetabular positioning employing data acquisition in the supine position and surgery in the lateral position ('flip technique'). We report 24 patients affected by primary osteoarthritis undergoing THA in which implants were placed with a conventional free-hand technique using the acetabular transverse ligament for cup orientation. For imageless navigation we used Orthopilot-Aesculap software. All patients had a postoperative computed tomography (CT) scan at three months, using previously validated dedicated software for cup orientation. Data collected using navigation software were compared with CT measurements. The mean acetabular inclination and anteversion recorded intra-operatively using navigation software were respectively 41°5' (SD: 9.61) and 9°5' (SD: 4.01) respectively. The mean inclination and anteversion calculated post-operatively by the CT based image software were 44°2' (SD 5.83) and 14°4' (SD 6.42) respectively. There was a statistically significant difference between the anteversion values (p=0.04). Therefore, the acquisition of parameters in the supine position with surgery performed in the lateral decubitus position creates unreliable data concerning cup anteversion using an imageless navigation system, and therefore the 'flip technique' cannot be recommended. |
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Authors:
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Alessandro Carcangiu; Carmelo D'Arrigo; Domenico Topa; Raffaella Alonzo; Attilio Speranza; Stefania De Sanctis; Andrea Ferretti |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-11-29 |
Journal Detail:
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Title: Hip international : the journal of clinical and experimental research on hip pathology and therapy Volume: - ISSN: 1724-6067 ISO Abbreviation: - Publication Date: 2011 Nov |
Date Detail:
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Created Date: 2011-12-2 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9200413 Medline TA: Hip Int Country: - |
Other Details:
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Languages: ENG Pagination: 0 Citation Subset: - |
Affiliation:
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Orthopaedic and Traumatology Department, S. Andrea Hospital, University of Rome La Sapienza, Rome - Italy. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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