Callus Formation After Total Hip Arthroplasty Using a Short Tapered-wedge Stem

Overview

Journal Skeletal Radiol

Specialties Orthopedics
Radiology

Date 2024 Jul 25

PMID 39052073

Authors

Seiya Ishii

Tomonori Baba

Yuichi Shirogane

Koju Hayashi

Yasuhiro Homma

Osamu Muto

Kazuo Kaneko

Muneaki Ishijima

Affiliations

Soon will be listed here.

Abstract

Objective: The incidence of periprosthetic fractures after total hip arthroplasty using a short tapered-wedge stem is high. Callus formation preceding this fracture, which indicates postoperative stress fracture around the stem, has been reported. However, previous studies on postoperative callus are limited. Hence, the current study aimed to evaluate the prevalence and risk factors of postoperative callus after total hip arthroplasty with a short tapered-wedge stem.

Materials And Methods: This retrospective study included 127 patients who underwent total hip arthroplasty using a cementless short tapered-wedge stem. The depth of stem insertion was measured as the distance from the lateral corner of the stem to the most medial point of the lesser trochanter along the body axis. Postoperative callus was defined as a bridging callus on the lateral femoral cortex at the distal end of the porous coating of the stem. Plain radiography was performed before surgery and immediately and at 1, 3, and 6 months after surgery to assess postoperative callus. Univariate and multivariate logistic regression analyses were performed to identify the risk factors for PC.

Results: In total, 60 (47.2%) of 127 patients presented with postoperative callus. Multivariate logistic regression analysis with postoperative callus as the dependent variable revealed that the stem depth at 1 month after total hip arthroplasty (odds ratio, 1.14; 95% confidence interval, 1.04-1.24, p = 0.002) was a significant and independent risk factor of postoperative callus.

Conclusion: Deep insertion of a short tapered-wedge stem is a risk factor for postoperative callus.

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