Evaluation of ulnar variance on wrist MR imaging: is it a reliable measure?
- PDF / 2,296,247 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 84 Downloads / 192 Views
SCIENTIFIC ARTICLE
Evaluation of ulnar variance on wrist MR imaging: is it a reliable measure? Aline Serfaty 1,2 & Hugo Pereira Costa 3 & Conrado Eduardo Foelker 3 & Eduardo Noda Kihara Filho 3 & Felipe Ferreira Souza 3 & Marcelo Bordalo-Rodrigues 3 Received: 16 August 2019 / Revised: 25 October 2019 / Accepted: 4 November 2019 # ISS 2019
Abstract Objective To determine if ulnar variance can be evaluated by magnetic resonance (MR) imaging and if this measure can be used as a reliable indicator when correlated to the gold standard technique, conventional radiography (CR). Materials and methods From January to July 2018, the MR images of 64 participants, comprising 66 wrists (mean age 34.9 years; 33 females; 31 males), were obtained. Among those, 29 were referred for evaluation of the wrist for different medical reasons and 35 were asymptomatic volunteers from our radiology group. All subjects had a plain radiography of the wrist in a posteroanterior view with a mean interval between images of 1 day. Local ethics committee approved the study and written informed consent was obtained from all patients. Two musculoskeletal radiologists evaluated the images. Correlation coefficients and a linear regression model were used for statistical analyses. Results Intra- and inter-observer analyses were performed for both diagnostic methods with results showing concordance (intraobserver: kappa score: MR 0.915/CR 0.931; p < 0.05; inter-observer: kappa score: MR 0.857/CR 0.931; p < 0.05). The intraclass correlations of MR and CR to evaluate agreement between the radiologists was slightly higher for radiologist #1 (0.771) than for radiologist #2 (0.659). A linear regression model showed good model fit indicating that MR does correlate with the ulnar variance as measured by CR (CR = 0.554 + 0.897 × MR, R2 = 0.665). Conclusion Although CR is the gold standard method for the evaluation of ulnar variance, our study demonstrated that MR can be used as a reliable qualitative option. Keywords Ulnar variance . Magnetic resonance . Conventional radiography
Introduction Ulnar variance (UV) is the distance between carpal articular surface of the ulna and the radius (Fig. 1), which can be neutral (both articular surfaces have the same length), positive (ulnar
* Aline Serfaty [email protected] 1
Department of Radiology, Faculty of Medicine, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
2
Medscanlagos Radiology, rua Manoel Francisco Valentim, 57, Cabo Frio, RJ 28906220, Brazil
3
Radiology Institute (INRAD), Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (HC/FMUSP), São Paulo, SP, Brazil
surface is longer), or negative (ulnar surface is shorter) (Fig. 2). The most common method used to measure UV is conventional radiography (CR), as it was the first method to be validated for that purpose and has been widely used since then (Fig. 3). Several ways of measuring UV have been studied. In 1982, Palmer, Glisson, and Werner [1] described the concentric circle method, an accurate and repro
Data Loading...
