Longitudinal magnetic resonance imaging of pseudotumors following metal-on-metal total hip arthroplasty

Masahiro Hasegawa; Noriki Miyamoto; Shinichi Miyazaki; Hiroki Wakabayashi; Akihiro Sudo

doi:10.1016/j.arth.2014.05.006

Longitudinal magnetic resonance imaging of pseudotumors following metal-on-metal total hip arthroplasty

J Arthroplasty. 2014 Dec;29(12):2236-8. doi: 10.1016/j.arth.2014.05.006. Epub 2014 May 15.

Authors

Masahiro Hasegawa¹, Noriki Miyamoto¹, Shinichi Miyazaki¹, Hiroki Wakabayashi¹, Akihiro Sudo¹

Affiliation

¹ Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, Tsu City, Mie, Japan.

PMID: 24931436
DOI: 10.1016/j.arth.2014.05.006

Abstract

The purpose of the study was to determine the natural history of pseudotumors following metal-on-metal total hip arthroplasty (THA) using magnetic resonance imaging (MRI). Initial MRI was conducted at a mean of 36months postoperatively. Follow-up MRI was performed at a mean of 20months after the detection of 24 asymptomatic pseudotumors. Pseudotumor size was determined on MRI. The mean pseudotumor size changed from 729mm(2) to 877mm(2). Pseudotumors increased in size in eight and decreased in six. Ten hips showed no changes. The bigger the pseudotumor size, the more likely the size would increase. In conclusion, pseudotumors frequently change in size. A single MRI study in the clinical decision-making process should be avoided and a longitudinal study should be performed.

Keywords: complications; magnetic resonance imaging; metal-on-metal; pseudotumor; total hip arthroplasty.

MeSH terms

Aged
Arthroplasty, Replacement, Hip / adverse effects*
Female
Foreign-Body Reaction / diagnosis*
Foreign-Body Reaction / etiology
Hip
Hip Prosthesis / adverse effects*
Humans
Magnetic Resonance Imaging*
Male
Metal-on-Metal Joint Prostheses / adverse effects*
Middle Aged