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Knee Surgery, Sports Traumatology, Arthroscopy
Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy 8/2017

19.11.2015 | Knee

Patient-specific instrumentation in total knee arthroplasty: simpler, faster and more accurate than standard instrumentation—a randomized controlled trial

verfasst von: João Vide, Tânia Pinto Freitas, Acácio Ramos, Henrique Cruz, João Paulo Sousa

Erschienen in: Knee Surgery, Sports Traumatology, Arthroscopy | Ausgabe 8/2017

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Abstract

Purpose

This randomized controlled trial was conducted to compare patient-specific instrumentation (PSI) to standard instrumentation regarding efficacy to achieve a good coronal alignment and differences in surgical time, blood loss and length of stay.

Methods

Ninety-five of 100 randomized patients eligible for total knee arthroplasty were analysed. PSI with magnetic resonance and long-leg radiograph was performed in 47 patients, while 48 patients received standard instrumentation. Primary outcome measure was coronal alignment, evaluated with long-leg radiograph. Deviation >3° varus/valgus was considered an outlier. Surgical time was compared from skin to skin. Length of stay was a post hoc analysis. Blood loss was evaluated comparing the number of blood units spent, fall in haemoglobin and haematocrit levels.

Results

Standard instrumentation had a higher number of outliers in the coronal alignment with a relative risk of 3.015, compared to PSI. Surgical time was reduced by 18 min (24.8 %) with the PSI, as well as length of stay, with a half-day reduction. Number of blood units spent was significantly less in the PSI group. Relative risk of transfusion was 7.09 for patients in the standard instrumentation group. Difference in Hg and Htc levels were not significant. No patient had to abandon PSI. Minor changes to preoperative plan occurred in 14.9 % of the patient: cut review in 4.3 % and insert change in 10.6 %.

Conclusions

Patient-specific instrumentation (PSI) is able to provide important advantages over standard instrumentation in total knee arthroplasty: it lowers the risk of outliers and transfusion, is a faster procedure and enables a shorter length of stay with a low rate of intraoperative adjustments.

Level of evidence

I.
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Metadaten
Titel
Patient-specific instrumentation in total knee arthroplasty: simpler, faster and more accurate than standard instrumentation—a randomized controlled trial
verfasst von
João Vide
Tânia Pinto Freitas
Acácio Ramos
Henrique Cruz
João Paulo Sousa
Publikationsdatum
19.11.2015
Verlag
Springer Berlin Heidelberg
Erschienen in
Knee Surgery, Sports Traumatology, Arthroscopy / Ausgabe 8/2017
Print ISSN: 0942-2056
Elektronische ISSN: 1433-7347
DOI
https://doi.org/10.1007/s00167-015-3869-0

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