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Case Reports in Orthopedics
Volume 2017, Article ID 1528201, 3 pages
Case Report

Hyperphosphatemic Tumoral Calcinosis after Total Knee Arthroplasty

1Department of Orthopedic Surgery, Kamagaya General Hospital, Chiba, Japan
2Institute of Rheumatology, Tokyo Women’s Medical University, Tokyo, Japan

Correspondence should be addressed to Takeshi Mochizuki; moc.liamg@omatumwt

Received 20 June 2017; Accepted 28 September 2017; Published 16 October 2017

Academic Editor: Taketoshi Yasuda

Copyright © 2017 Takeshi Mochizuki and Katsunori Ikari. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We report a case of hyperphosphatemic tumoral calcinosis (TC) that occurred after total knee arthroplasty. A 64-year-old Japanese man presented with painful swellings in both shoulders, the left elbow, and the right hip that developed after he underwent total knee arthroplasty (TKA). The pathology of the patient’s bone at the time of TKA included a thick osteoid seam with calcareous deposition at the margin of the trabecular bone, which is not generally seen in osteoarthritis. Computed tomography scans of the swollen joints demonstrated leaflet and amorphous calcification masses around the joints. We diagnosed the patient with TC. The present case highlights that TC lesions are rare but should be considered in the differential diagnosis of subcutaneous soft and hard masses around the joint.