Retrospective Cohort Study
Copyright ©The Author(s) 2021. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Orthop. Jun 18, 2021; 12(6): 395-402
Published online Jun 18, 2021. doi: 10.5312/wjo.v12.i6.395
Dermatomyositis and polymyositis in total hip arthroplasty
Samuel Rosas, Michael Schallmo, Anirudh Krishna Gowd, Matthew Reynolds Akelman, T David Luo, Cynthia Lynn Emory, Johannes Frank Plate
Samuel Rosas, Anirudh Krishna Gowd, Matthew Reynolds Akelman, T David Luo, Cynthia Lynn Emory, Johannes Frank Plate, Department of Orthopedic Surgery, Wake Forest School of Medicine, Winston Salem, NC 27101, United States
Michael Schallmo, Department of Orthopedic Surgery, Atrium Healthcare, Charlotte, NC 28203, United States
Author contributions: All of the authors have contributed to the final manuscript encompassed herein.
Institutional review board statement: Retrospective, HIPAA compliant database does not require IRB review.
Informed consent statement: The written informed consent was waived.
Conflict-of-interest statement: None of the authors report a conflict of interest with this paper.
Data sharing statement: Technical appendix, statistical code, and dataset available from the corresponding author at
STROBE statement: The authors have read the STROBE Statement—checklist of items, and the manuscript was prepared and revised according to the STROBE Statement—checklist of items.
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:
Corresponding author: Samuel Rosas, MD, PhD, Doctor, Department of Orthopedic Surgery, Wake Forest School of Medicine, 1 Medical Center Boulevard, Winston Salem, NC 27101, United States.
Received: January 3, 2021
Peer-review started: January 3, 2021
First decision: March 1, 2021
Revised: March 22, 2021
Accepted: May 20, 2021
Article in press: May 20, 2021
Published online: June 18, 2021
Research background

There is a paucity of data evaluating patients with dermatomyositis (DM) and polymyositis (PM) undergoing total hip arthroplasty (THA).

Research motivation

To compare and contrast the outcomes of patients undergoing THA with DM and PM vs a matched control without inflammatory arthropathies.

Research objectives

To elucidate whether patients with DM and PM have increased risk of complications and greater 90-d costs when undergoing THA compared to controls.

Research methods

A retrospective case control was performed based on the medicare data.

Research results

Patients with DM and PM had increased rates of pneumonia [odds ratio (OR) 1.45, P < 0.001] and pulmonary embolism (OR 1.46, P = 0.035) and decreased hematoma risks (OR 0.58, P = 0.00). 90-d costs were on average $1411 greater for those with idiopathic inflammatory myopathies (IIM) yet not significantly different (P = 0.034).

Research conclusions

Patients with IIM have an increased 90-d rate of pneumonia and pulmonary embolism concomitant with a decreased hematoma rate consistent with their pro-coagulatory state.

Research perspectives

It is important to evaluate deep vein thrombose prophylaxis and respiratory status in those undergoing THA with DM or PM.