Role of Sonographic Examination in Traumatic Knee Internal Derangement
Abstract
Wang C-Y, Wang H-K, Hsu C-Y, Shieh J-Y, Wang T-G, Jiang C-C. Role of sonographic examination in traumatic knee internal derangement.
Objectives
To define the accuracy (compared with magnetic resonance imaging [MRI]) of sonographic examination in detecting knee effusion and to determine whether the presence of knee effusions in patients with traumatic knee injury can predict knee internal derangement as assessed by MRI.
Design
Prospective study.
Setting
Hospital rehabilitation department.
Participants
Thirty patients (19 men, 11 women) with traumatic knee injury were recruited. Subjects received sonographic examination and MRI on the same day.
Interventions
Not applicable.
Main Outcome Measures
The presence or absence of knee effusion was assessed by sonographic examination. MRI was used as criterion standard to evaluate whether the presence of knee effusion and internal derangement, which included tear of anterior and posterior cruciate ligaments, as well as meniscus tear.
Results
The sensitivity of sonographic examination for detecting knee effusion was 79.1%, and specificity was 50%. The positive-predictive value (PPV) was 86.3% and negative-predictive value (NPV) was 37.5%. The PPV of sonographic effusion to internal derangement was 90.9%, and the NPV was 37.5%.
Conclusions
Sonographic examination can accurately detect effusion of the knee. The detection of knee effusion in patients with traumatic knee injury by sonographic examination is highly indicative of internal knee derangement.
aDepartment of Physical Medicine and Rehabilitation, National Taiwan University, Taipei, Taiwan
bDepartment of Medical Imaging, National Taiwan University, Taipei, Taiwan
cDepartment of Orthopaedic Surgery, National Taiwan University, Taipei, Taiwan
dSchool and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, Taipei, Taiwan.
Reprint requests to Tyng-Guey Wang, MD, Dept of Physical Medicine and Rehabilitation, National Taiwan University Hospital, 7 Chang-Shan S Rd, Taipei, Taiwan
No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit upon the author(s) or upon any organization with which the author(s) is/are associated.
ABSTRACT