Reducing variability in apparent operative inclination during total hip arthroplasty: findings of a randomised controlled trial

Hip International : the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
Christopher K J O'NeillDavid E Beverland

Abstract

To determine which of 3 methods of cup insertion most accurately achieved a target apparent operative inclination (AOI) of 35° ± 2.5°: (1) Freehand; (2) Modified Mechanical Alignment Guide (MAG); or (3) Digital Inclinometer assisted. Using a cementless cup via a posterior approach in lateral decubitus 270 participants were recruited, with 90 randomised to each method. The primary outcome was the unsigned deviation from target AOI. The digital inclinometer was used to measure AOI in all cases, though the surgeon remained blinded to the reading intraoperatively for both the Freehand and MAG methods. Mean deviation from target AOI for the Freehand, Modified 35° MAG and Digital Inclinometer techniques was 2.9°, 1.8° and 1.3° respectively. When comparing mean deviation from target AOI, statistically significant differences between the Freehand / Inclinometer groups ( p < 0.001), the Freehand / Modified 35° MAG groups ( p < 0.001) and the Digital Inclinometer / Modified 35° MAG groups ( p < 0.023) were evident. The Digital Inclinometer technique enabled the surgeon to achieve a target AOI of 35° ± 2.5° in 88% of cases, compared to 71% of Modified 35° MAG cases and only 51% of Freehand cases. The Digital Inclinometer and the Modified ...Continue Reading

References

Mar 1, 1993·The Journal of Bone and Joint Surgery. British Volume·D W Murray
Oct 3, 2006·The Journal of Bone and Joint Surgery. British Volume·M HonlM Wimmer
Nov 4, 2008·Clinical Orthopaedics and Related Research·Zhinian WanLawrence D Dorr
Aug 28, 2010·The Journal of Bone and Joint Surgery. British Volume·J C HillD E Beverland
Oct 4, 2013·The Journal of Bone and Joint Surgery. American Volume·Robert L BarrackRyan M Nunley
Jan 7, 2016·The Bone & Joint Journal·D E BeverlandJ C Hill
Aug 10, 2017·Indian Journal of Orthopaedics·Deepu BhaskarTim Board
Sep 1, 2018·Hip International : the Journal of Clinical and Experimental Research on Hip Pathology and Therapy·Christopher K J O'NeillDavid E Beverland
Sep 1, 2018·Hip International : the Journal of Clinical and Experimental Research on Hip Pathology and Therapy·Christopher K J O'NeillDavid E Beverland

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Citations

Sep 1, 2018·Hip International : the Journal of Clinical and Experimental Research on Hip Pathology and Therapy·Christopher K J O'NeillDavid E Beverland
Sep 1, 2018·Hip International : the Journal of Clinical and Experimental Research on Hip Pathology and Therapy·Christopher K J O'NeillDavid E Beverland
Aug 5, 2020·Hip International : the Journal of Clinical and Experimental Research on Hip Pathology and Therapy·Bernard H van DurenHemant Pandit
Aug 28, 2020·Journal of the American Academy of Orthopaedic Surgeons. Global Research & Reviews·Hosam E MatarMartyn L Porter

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Clinical Trials Mentioned

NCT01831401

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Stata
SPSS

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