J Knee Surg 2018; 31(08): 730-735
DOI: 10.1055/s-0037-1607059
Original Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Quantitative Evaluation of Joint Space Width in the Lateral Compartment after Medial Unicompartmental Knee Arthroplasty: Comparison of Three Radiographic Views

Ju'an Yue
1  Beijing University of Chinese Medicine, Beijing, China
,
Wanshou Guo
2  Department of Joint Surgery, China–Japan Friendship Hospital, Beijing, China
,
Fuyin Wan
3  Peking University, Beijing, China
,
Pengfei Wen
3  Peking University, Beijing, China
,
Zhaohui Liu
2  Department of Joint Surgery, China–Japan Friendship Hospital, Beijing, China
,
Liming Cheng
2  Department of Joint Surgery, China–Japan Friendship Hospital, Beijing, China
,
Qidong Zhang
2  Department of Joint Surgery, China–Japan Friendship Hospital, Beijing, China
,
Yan Chen
4  Department of Radiology, China–Japan Friendship Hospital, Beijing, China
› Author Affiliations
Further Information

Publication History

03 February 2017

25 August 2017

Publication Date:
04 October 2017 (eFirst)

Abstract

Lateral compartment cartilage deterioration is the most common complication affecting medial unicompartmental knee arthroplasty (UKA) survivorship. The purpose of this study was to determine the best method of judging the degeneration of cartilage in the lateral compartment after medial UKA through analysis of different radiographic views. Forty-two participants were divided into two groups. Patients in Group A were followed for at least 10 months after undergoing a medial UKA (mean: 17.67 ± 7.65 months, range: 10–24 months), whereas those in Group B were evaluated 3 days after surgery. Joint space width in the lateral compartment of all patients was evaluated using three types of knee radiographs: weight-bearing anterior posterior (AP), supine AP, and supine valgus stress. No difference in joint space width in the lateral compartment after medial UKA was found for the three kinds of radiographs in Group A (F = 0.97, p = 0.39) and Group B (F = 1.499, p = 0.233). After evaluating the patients 3 days after surgery or following them for approximately 18 months after medial UKA, we determined that weight-bearing AP, supine AP, and supine valgus stress knee radiographs were comparable when used to assess residual cartilage thickness of the lateral compartment.