Retrospective Cohort Study
Copyright ©The Author(s) 2019. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Orthop. Mar 18, 2019; 10(3): 128-136
Published online Mar 18, 2019. doi: 10.5312/wjo.v10.i3.128
Short-term differences in anterior knee pain and clinical outcomes between rotating and fixed platform posterior stabilized total knee arthroplasty with a new femoral component design
Marco Bigoni, Nicolò Zanchi, Marco Turati, Gabriele Pirovano, Giovanni Zatti, Daniele Munegato
Marco Bigoni, Nicolò Zanchi, Marco Turati, Gabriele Pirovano, Giovanni Zatti, Daniele Munegato, Orthopedic Department, San Gerardo Hospital, University of Milano-Bicocca, Monza 20900, Italy
Marco Bigoni, Giovanni Zatti, Department of Medicine and Surgery, University of Milano-Bicocca, Monza 20900, Italy
Marco Turati, Department of Paediatric Orthopedic Surgery, University Hospital Grenoble-Alpes, Grenoble-Alpes University, Grenoble 38043, France
Author contributions: Bigoni M, Zanchi N, Turati M, Pirovano G, Zatti G and Munegato D designed the research; Zanchi N, Turati M, Pirovano G and Munegato D performed the research; Zanchi N, Turati M and Pirovano G analyzed the data; Bigoni M, Zanchi N and Munegato D wrote the paper and Turati M, Pirovano G and Zatti G critically revised the manuscript for important intellectual content.
Institutional review board statement: This study and the protocols used in the study were approved by the Institutional Review Board (IRB) of San Gerardo Hospital, Monza (MB), Italy.
Informed consent statement: All the patients included in the study gave their written informed consent prior to study inclusion.
Conflict-of-interest statement: The authors did not received any kind of financial support and certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria, educational grants, participation in speakers’ bureaus, membership, employment, consultancies, stock ownership, or other equity interest, and expert testimony or patent-licensing arrangements) or non-financial interest (such as personal or professional relationships, affiliations, knowledge, or beliefs) in the subject matter or materials discussed in this manuscript. This manuscript is original and has not been previously published.
STROBE statement: Guidelines of the STROBE Statement have been adopted in this article (checklist attached).
Open-Access: This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
Corresponding author: Zanchi Nicolò, MD, Doctor, Orthopedic Department, San Gerardo Hospital, University of Milano-Bicocca, Via Pergolesi 33, Monza 20900, Italy. nicolo.zanchi@gmail.com
Telephone: +39-3-96306090 Fax: +39-3-92333944
Received: July 27, 2018
Peer-review started: July 27, 2018
First decision: August 20, 2018
Revised: October 18, 2018
Accepted: November 26, 2018
Article in press: November 27, 2018
Published online: March 18, 2019
Processing time: 142 Days and 17.7 Hours
ARTICLE HIGHLIGHTS
Research background

Anterior knee pain is one of the most common complications after total knee arthroplasty (TKA). Several aspects can cause this problem included muscle imbalances, dynamic valgus, patellofemoral compartment overstuffing, rotational alignment mistakes and prosthetic design.

In 2009 Press-Fit Condylar (PFC) Sigma femoral component was re-designed in order to improve patellar tracking and reduce anterior knee pain.

This new knee prothesis was available with rotating or fixed platform under the name of PFC Sigma posterior stabilized (PS).

Research motivation

Only a few studies have analyzed clinical results of this new prothesis as primary outcome.

Research objectives

The aim to this study is to compare rotating versus fixed-bearing PFC Sigma PS with the new “J curve” femoral design in terms of clinical outcomes and anterior knee pain with two years of follow up.

Research methods

Retrospective study with 39 patients underwent primary TKA with PFC Sigma PS TKA.

We analyzed clinical outcomes two years after surgery with Knee Society Score Knee Society score, Knee Injury and Osteoarthritis Outcome Score (KOOS), Knee Performance Score, Short Form Health Survey (SF-36), and Hospital for Special Surgery (HSS) Patellar Score.

Research results

We found better clinical results (HSS Patellar score and KOOS) in PFC Sigma PS rotating platform compared to fixed platform.

Research conclusions

PFC Sigma PS rotating platform reduce the short term incidence of anterior knee pain compared to the fixed platform model and improve clinical outcomes.

Research perspectives

Long term follow up studies will be useful to understand if this difference will be unchanged over time.