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  4. Verification of a novel measuring method for determining pre- and postoperative leg length in the context of total hip arthroplasty: A technical feasibility study
 
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2018
Journal Article
Title

Verification of a novel measuring method for determining pre- and postoperative leg length in the context of total hip arthroplasty: A technical feasibility study

Other Title
Prüfung eines neuen Messverfahrens zur Bestimmung der prä- und postoperativen Beinlänge im Zusammenhang mit Hüftendoprothesen Operation - eine technische Maßnahmestudie
Abstract
Following total hip arthroplasty (THA), leg length can easily be modified, for example by different-sized endoprosthetic components. Currently, precise reconstruction depends mainly on the assessment of the surgeon. The aim of this study was to determine the accuracy of a new optical measuring system (OMS) using a novel measuring method capable of determining changes in leg length. Measurements with different investigators on an artificial leg and under clinical conditions were carried out. Measurements under clinical conditions were accomplished with a human body donor before and following prosthetic hip implantation. Furthermore, computed tomography (CT) was used to compare the function and the precision of the OMS relating to established measuring methods. The following results were achieved. The overall mean result of preoperative leg length determination by the OMS was 775.3 ± 5.8 mm (CT: 786.4 mm). The overall mean result of postoperative leg length determination by the OMS was 776.9 ± 10.8 mm (CT: 795.0mm). Measurements carried out showed that the novel measuring method works in principle. However, the viable prototype based on it has a lower accuracy compared to CT-based reference measurements, indicating the necessity of integrating more precise hardware.
Author(s)
Schmidt, Michael
Universität Leipzig, Medizinische Fakultät, Zentrum zur Erforschung der Stütz- und Bewegungsorgane
Prietzel, Torsten
Helios Klinik Blankenhain, Abteilung Orthopädie und Unfallchirurgie
Wendler, Toni
Universität Leipzig, Medizinische Fakultät, Zentrum zur Erforschung der Stütz- und Bewegungsorgane
Möbius, Robert
Universität Leipzig, Medizinische Fakultät, Zentrum zur Erforschung der Stütz- und Bewegungsorgane
Schleifenbaum, Stefan
Universität Leipzig, Medizinische Fakultät, Zentrum zur Erforschung der Stütz- und Bewegungsorgane
Hammer, Niels
University of Otago, Dunedin, Department of Anatomy, University of Otago, Dunedin, New Zealand
Grunert, Ronny  
Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik IWU  
Journal
Journal of Medical Engineering and Technology  
DOI
10.1080/03091902.2019.1579263
Language
English
Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik IWU  
Keyword(s)
  • leg length determination

  • CT-free

  • pre- and postoperative measurements

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