Retrospective Study
Copyright ©The Author(s) 2020. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Orthop. Apr 18, 2020; 11(4): 232-242
Published online Apr 18, 2020. doi: 10.5312/wjo.v11.i4.232
Total hip replacement using MINIMA® short stem: A short-term follow-up study
Georgios I Drosos, Stylianos Tottas, Ioannis Kougioumtzis, Konstantinos Tilkeridis, Christos Chatzipapas, Athanasios Ververidis
Georgios I Drosos, Stylianos Tottas, Ioannis Kougioumtzis, Konstantinos Tilkeridis, Christos Chatzipapas, Athanasios Ververidis, Orthopaedic Department, Democritus University of Thrace, University General Hospital of Alexandroupolis, Alexandroupolis 68100, Greece
Author contributions: All authors helped to perform the research; Drosos GI contribution to the manuscript writing, performing procedures, drafting conception, design and data analysis; Tottas S contribution to writing the manuscript, drafting conception and design; Kougioumtzis I contribution to writing the manuscript; Tilkeridis K contribution to writing the manuscript, performing procedures; Christos C contribution to writing the manuscript; Ververidis A contribution to writing the manuscript, performing procedures.
Institutional review board statement: This study was reviewed and approved by the Ethics Committee of the University General Hospital of Alexandroupolis.
Informed consent statement: Patients were not required to give informed consent to the study because the analysis used anonymous clinical data that were obtained after each patient agreed to treatment by written consent.
Conflict-of-interest statement: All authors declare no conflicts-of-interest related to this article.
Data sharing statement: No additional data are available.
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (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: Georgios I Drosos, MD, PhD, Professor of Orthopaedics, Orthopaedic Department, Democritus University of Thrace, University General Hospital of Alexandroupolis, St. Niarhos Street, Dragana, Alexandroupolis 68100, Greece. drosos@otenet.gr
Received: October 29, 2019
Peer-review started: October 29, 2019
First decision: December 12, 2019
Revised: December 19, 2019
Accepted: March 12, 2020
Article in press: March 12, 2020
Published online: April 18, 2020
Processing time: 167 Days and 6.5 Hours
Abstract
BACKGROUND

Total hip replacement has become one of the most successful orthopaedic procedures. The length of the femoral stem constitutes one of the most important geometrical and mechanical features of the prosthesis. Several different implants are currently available but data are limited concerning the clinical results for some of these implants.

AIM

To report the short-term clinical and radiological results of a novel squared section, tapered design – with four conicity - short stem in total hip replacement.

METHODS

This is a retrospective study of a prospectively collected data using of MINIMA® short stem in 61 consecutive patients with at least 1 year follow-up. The collected data included patients’ demographics, type of arthritis, bone morphology, perioperative data, clinical results using Harris Hip Score, EuroQol (EQ-5D), pain score and satisfaction rate, complications and radiological results.

RESULTS

Total 61 patients were included in our study with a mean age of 56 years of age (range 25-73 years). The majority of them (68.6%) were women, thirty seven patients (56.9%) were less than 60 years of age and almost half of patients (45.1%) suffered from secondary osteoarthritis (hip dysplasia, osteonecrosis, etc.). The mean time of follow-up examination was 33.4 mo (2.8 years) with a range of 12-57 months (1-4.8 years). In 35 patients (56.9%) the follow-up examination was more than 3 years. No major complications such as revision, periprosthetic fracture, dislocation or infection were presented. Re-admission 90 d postoperatively or laterwas deemed unnecessary for any reason regarding the operation. Respectively, the mean pain score, mean Harris hip score, and mean EQ-5D were improved from 6.3, 58.7 and 77.3 preoperatively to 0.1, 95.1, and 79.8 postoperatively. The Satisfaction rate at the final follow-up was 9.9 (SD 0.3, range 8.0-10.0). All stems were classified as stable bone ingrowth and no radiolucent lineswere revealed in any of the modified Gruens’ zone at the postoperative X-rays. Stem subsidence was within acceptable limits and the incidence of distal cortical hypertrophy was relatively low.

CONCLUSION

The clinical and radiological results concerning the MINIMA® short stem are excellent according to this first report of this specific design of the short femoral stems. Because of the small number of cases and short-term follow-up of this study, a longer follow up time and more patients’ enrollment is required.

Keywords: Total hip replacement; Total hip arthroplasty; Short-stem; Hip prostheses; Femoral components; MINIMA® stem

Core tip: Total hip replacement has become one of the most successful orthopaedic procedures. The length of the femoral stem constitutes one of the most important geometrical and mechanical features of the prosthesis. Several different implants are currently available but data are limited concerning the clinical results for some of these implants. Our objective is to report the short-term results of a novel squared section, tapered design –with four conicity- short stem. According to our findings the clinical and radiological results were excellent in the short-term follow-up using the MINIMA® short stem in total hip replacement.