The use of accelerometer-based navigation for coronal TKA alignment: a prospective, single surgeon comparative study

Abstract

Introduction

There is the need for a device that can be used to accurately position components during total knee arthroplasty (TKA) with minimal impact on procedure time, workflow and cost. This study aimed to investigate the accuracy and time efficiency of a novel, accelerometer-based navigation system (ABN).

Methods

This prospective, single surgeon study of patients undergoing TKA for osteoarthritis over a 5 year period involved a total of 138 patients: 110 using the ABN system and 28 without. The ABN system consists of two coupled inertial pods that are secured to resection guides, providing a body-fixed 3D coordinate system for limb segments. Post-operative coronal alignment was measured from standardised long-leg AP radiographs. Deviation of the femur and tibia from the neutral coronal mechanical axis was recorded. Intra-observer repeatability was performed on three independent blinded data sets. The BMI and the surgical time (skin to skin) were recorded for all patients.

Results

The mean BMI was 34 in the ABN group and 33 in the control group (p = 0.92). The skin-to-skin time was also similar between the groups; 105 min in the navigation group and 100 min in the control group (p = 0.297). The use of navigation resulted in significantly fewer outliers as defined by < 3º deviation from the target angle. 3 of 110 navigated patients recorded an AP femur angle of more than 3º from the target of 90º, where 5 of 28 control patients fell outside of the ± 3º window (p = 0.009, Fig. 1).

Conclusion

The use of the ABN system significantly improved accuracy of implant position and alignment without increasing surgical time.

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Fig. 1
Fig. 2

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Correspondence to Mark Zhu.

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Zhu, M., Lindsay, E., Keenan, A. et al. The use of accelerometer-based navigation for coronal TKA alignment: a prospective, single surgeon comparative study. Arch Orthop Trauma Surg 140, 1169–1174 (2020). https://doi.org/10.1007/s00402-019-03295-4

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Keywords

  • Knee arthroplasty
  • Navigation
  • ABN
  • Alignment