Association of Total Hip Arthroplasty Flexural Rigidity With Magnetic Resonance Imaging and Histological Findings

Sara E Sacher; Elexis C Baral; Timothy M Wright; Thomas W Bauer; Qian Li; Douglas E Padgett; Hollis G Potter; Matthew F Koff

doi:10.1016/j.arth.2024.02.072

Association of Total Hip Arthroplasty Flexural Rigidity With Magnetic Resonance Imaging and Histological Findings

J Arthroplasty. 2024 Feb 28:S0883-5403(24)00192-X. doi: 10.1016/j.arth.2024.02.072. Online ahead of print.

Authors

Sara E Sacher¹, Elexis C Baral², Timothy M Wright², Thomas W Bauer³, Qian Li¹, Douglas E Padgett⁴, Hollis G Potter¹, Matthew F Koff¹

Affiliations

¹ Hospital for Special Surgery, Department of Radiology, New York, New York.
² Hospital for Special Surgery, Department of Biomechanics, New York, New York.
³ Hospital for Special Surgery, Department of Pathology and Laboratory Medicine, New York, New York.
⁴ Hospital for Special Surgery, Adult Reconstruction and Joint Replacement, New York, New York.

PMID: 38428693
DOI: 10.1016/j.arth.2024.02.072

Abstract

Background: Modular connections in total hip arthroplasty (THA) offer surgical advantages, but can contribute to implant fretting and corrosion due to micromotion at the head-stem interface. Previous studies implicated lower flexural rigidity as a key contributing factor to THA corrosion and fretting, but none associated flexural rigidity with direct histological evaluation or magnetic resonance imaging (MRI) outcomes. The purpose of this study was to determine how implant flexural rigidity is associated with MRI imaging metrics and histopathological outcomes in patients who have a failed THA.

Methods: Patients requiring revision THA surgery underwent preoperative MRIs with 3-dimensional multispectral imaging techniques to suppress metal artifacts. The MRI images were graded for adverse local tissue reactions. For each hip, trunnion flexural rigidity was measured from the retrieved femoral stem, and a periprosthetic tissue sample was retrieved and evaluated using semiquantitative histology. Generalized linear models and analyses of variance were used to assess associations between flexural rigidity and MRI and histology outcomes.

Results: A total of 106 THA stems were retrieved (46 women and 60 men, age: 68 years (range, 60 to 73 years). After adjustment for length of implantation, flexural rigidity was negatively correlated with histologic aseptic lymphocyte-dominant vasculitis-associated lesion severity (β = -26.27, P = .018), Fujishiro lymphocyte grading (β = -13.4, P = .039), perivascular lymphocyte layers (β = -17.8, P = .022), the grade of tissue organization (β = -22.5, P = .009), the presence of diffuse synovitis (β = -66.5, P = .003), and the presence of lymphoid aggregates (β = -75.9, P = .022). No association was found between MRI metrics and flexural rigidity.

Conclusions: Among these implants, decreased trunnion stiffness was associated with increased histologic features of adverse host-mediated soft tissue reactions.

Keywords: ALTR; MRI; flexural rigidity; histopathology; total hip arthroplasty.