"False Patellar Duplication" Originated from Synovial Osteochondromatosis in Knee Joint: A Rare Case Report

Dung Tran Trung; Tung Pham Son; Thien Chu Dinh; Toi Chu Dinh

doi:10.3889/oamjms.2019.3891

"False Patellar Duplication" Originated from Synovial Osteochondromatosis in Knee Joint: A Rare Case Report

Open Access Maced J Med Sci. 2019 Dec 20;7(24):4347-4350. doi: 10.3889/oamjms.2019.3891. eCollection 2019 Dec 30.

Authors

Dung Tran Trung^{1

2}, Tung Pham Son¹, Thien Chu Dinh³, Toi Chu Dinh⁴

Affiliations

¹ Saint Paul University Hospital, Hanoi, Vietnam.
² Hanoi Medical University, Hanoi, Vietnam.
³ Institute for Research and Development, Duy Tan University, 03 Quang Trung, Danang, Vietnam.
⁴ Department of Human and Animal Physiology, Faculty of Biology, Hanoi National University of Education, Hanoi, Vietnam.

Abstract

Background: "False patellar duplication" is a situation where there are two pieces in the position of a knee-joint like patella. It can derive from cartilage tumors, soft tissue tumors, or gout tumors, or due to the heterotopic ossification, forming a sub patella in the knee joint.

Case report: A woman, 57 years old, healthy history, she has hospitalized for right knee joint pain since 2 years. Diagnosis: the synovial osteochondromatosis of the right knee. We decided to conduct and arthroscopy and removal. After 18 months surgery, the patient knee joint is currently good, range of motion (ROM) (-10)°- 0°-160°, Lysholm Knee Scoring Scale 85/100 point.

Conclusion: This is the second case in the world and the first case in Vietnam. This is an experience in the process of diagnosis, arthroscopic treatment and differentiation from the "double patellae" status.

Keywords: False patellar duplication; Synovial osteochondromatosis.