Evaluation of the Sigmoid Notch Involvement in the Intra-Articular Distal Radius Fractures: The Efficacy of Computed Tomography Compared with Plain X-ray.
- Author:
Youn Moo HEO
1
;
Jae Young ROH
;
Sang Bum KIM
;
Jin Woong YI
;
Kwang Kyoon KIM
;
Byung Hak OH
;
Hyeong Tak OH
Author Information
- Publication Type:Original Article ; Comparative Study
- Keywords: Distal radius; Intra-articular fracture; Sigmoid notch; Computed tomography
- MeSH: Adolescent; Adult; Aged; Aged, 80 and over; Female; Humans; Intra-Articular Fractures/*radiography; Male; Middle Aged; Predictive Value of Tests; Radius Fractures/*radiography; Sensitivity and Specificity; *Tomography, X-Ray Computed; Young Adult
- From:Clinics in Orthopedic Surgery 2012;4(1):83-90
- CountryRepublic of Korea
- Language:English
- Abstract: BACKGROUND: The purpose of this study is to evaluate the efficacy of computed tomography (CT) scans compared with plain radiographs on detecting the involvement of the sigmoid notch. METHODS: This study involved 121 cases diagnosed as the intra-articular distal radius fracture and performed post-reduction CT scans. We determined the presence of the sigmoid notch involvement with both plain radiographs and CT scans and compared findings of plain radiographs with CT scans about the incidence and the pattern of injuries. And the differences of results between arbeitsgemeinschaft fur osteosyntheses (AO) type C2 and C3 were compared. RESULTS: The incidences of sigmoid notch involvement detected in plain radiographs were 81 cases (66.9%), whereas CT scans were 99 cases (81.9%). The sensitivity of plain radiographs compared with CT scans was 74.7%, the specificity was 68.2%, the positive predictive value was 91.4%, the negative predictive value was 37.5%, the false negative value was 25.3%, and the false positive value was 31.8%. In comparison between AO type C2 and C3, the incidence of sigmoid notch involvement was not a significant difference, but the displacement of fracture fragment showed a significant difference. CONCLUSIONS: The intra-articular distal radius fracture usually accompanies the sigmoid notch involvement. Considering that the evaluation of sigmoid notch involvement by plain radiography often results in misinterpretation or underestimation, performing CT scan in intra-articular distal radius fracture is thought to be beneficial.
