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Patient-specific instrumentation improves tibial component rotation in TKA

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

Abstract

Purpose

To compare the femoral and tibial components rotational alignment in total knee arthroplasty (TKA) performed either with conventional or with patient-specific instrumentation.

Methods

Forty-five patients underwent primary TKA and were prospectively randomized into two groups: 22 patients into the conventional instrumentation group (group A) and 23 patients into the Signature™ patient-specific instrumentation group (group B). All patients underwent computed tomography of the operated knee in the first week after surgery to measure the components rotation.

Results

The femoral component rotation was 0.0° (−0.25, 1.0) in group A, and 0.0° (0.0, 1.0) in group B. The tibial component rotation was −16.0° (−18.5, 11.8) in group A, and −16.0° (−19.0, −14.0) in group B. There were no significant differences between the two groups in tibial and femoral components rotation. The difference between the tibial component rotation and the neutral tibial rotation was similar in both groups [2.0° (−0.5, 6.3) in group A and 2.0° (−1.0, 4.0) in group B], but the dispersion around the median was different between the two groups. The amplitude of the difference between tibial rotation and neutral position was 27° (−13, 14) in group A and 9° (−3, 6) in group B.

Conclusions

There is a smaller chance of internal malrotation of the tibial component with the Signature™ patient-specific instrumentation system, with less dispersion and amplitude of the tibial component rotation around the neutral position.

Level of evidence

II.

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Authors and Affiliations

  1. Orthopedics Departament, Hospital Militar D. Pedro V, Avenida da Boavista, 4050-113, Porto, Portugal

    Alcindo Silva

  2. Hospital da Boavista, 171, Avenida da Boavista, 4050-113, Porto, Portugal

    Ricardo Sampaio

  3. Department of Hygiene and Epidemiology, Medical School of University of Porto, Alameda Prof. Hernani Monteiro, 4200-319, Porto, Portugal

    Elisabete Pinto

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  1. Alcindo Silva
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  2. Ricardo Sampaio
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  3. Elisabete Pinto
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Correspondence to Alcindo Silva.

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Silva, A., Sampaio, R. & Pinto, E. Patient-specific instrumentation improves tibial component rotation in TKA. Knee Surg Sports Traumatol Arthrosc 22, 636–642 (2014). https://doi.org/10.1007/s00167-013-2639-0

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  • DOI: https://doi.org/10.1007/s00167-013-2639-0

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