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Clinical Orthopaedics and Related Research®

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01-07-2010 | Basic Research

Leg Length and Offset Measures with a Pinless Femoral Reference Array during THA

Authors: Tobias Renkawitz, MD, Tibor Schuster, Joachim Grifka, MD, PhD, Thomas Kalteis, MD, PhD, Ernst Sendtner, MD

Published in: Clinical Orthopaedics and Related Research® | Issue 7/2010

Abstract

The bony fixation of reference marker arrays used for computer-assisted navigation during total hip arthroplasty (THA) theoretically involves the risk of fracture, infection, and/or pin loosening. We asked whether intraoperative assessment of leg length (LL) and offset (OS) changes would be accurate using a novel pinless femoral reference system in conjunction with an imageless measurement algorithm based on specific realignment of the relationship between a dynamic femoral and pelvis reference array. LL/OS measurements were recorded during THA in 17 cadaver specimen hips. Preoperatively and postoperatively, specimens were scanned using CT. Linear radiographic LL/OS changes were determined by two investigators using visible fiducial landmarks and image processing software. We found a high correlation of repeated measurements within and between (both 0.95 or greater) the two examiners who did the CT assessments. Pinless LL/OS values showed mean differences less than 1 mm and correlations when compared with CT measurements.

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Title: Leg Length and Offset Measures with a Pinless Femoral Reference Array during THA
Authors: Tobias Renkawitz, MD
Tibor Schuster
Joachim Grifka, MD, PhD
Thomas Kalteis, MD, PhD
Ernst Sendtner, MD
Publication date: 01-07-2010
Publisher: Springer-Verlag
Published in: Clinical Orthopaedics and Related Research® / Issue 7/2010
Print ISSN: 0009-921X
Electronic ISSN: 1528-1132
DOI: https://doi.org/10.1007/s11999-009-1086-1

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Leg Length and Offset Measures with a Pinless Femoral Reference Array during THA

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