Comparison of CT and MRI in the imaging evaluation of acute patellar dislocation in adolescents
10.3760/cma.j.cn115530-20240514-00207
- VernacularTitle:CT与MRI在青少年急性髌骨脱位影像评估中的效果比较
- Author:
Yiheng WU
1
;
Hongbo ZHAO
;
Hongyan ZHOU
;
Junran LI
;
Bokai WANG
;
Jinlong ZHANG
Author Information
1. 唐山市第二医院骨科，唐山 063000
- Publication Type:Journal Article
- Keywords:
Adolescents;
Patellar dislocation;
Comparative study;
CT;
MRI
- From:
Chinese Journal of Orthopaedic Trauma
2025;27(2):156-162
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To explore advantages of CT and MRI imaging in clinical assessment of specific indicators (trochlear dysplasia and tibial tubercle lateralization) of acute patellar dislocation in adolescents by comparing CT versus MRI imaging.Methods:A retrospective study was conducted to analyze the CT and MRI imaging data of 73 patients with acute patellar dislocation who had been admitted to Department of Orthopedics, The Second Hospital of Tangshan from January 2014 to September 2024. There were 37 males (21 left knees and 16 right knees) and 36 females (19 left knees and 17 right knees), with a mean age of 15 (13, 16) years. On MRI images, the distance between the patellar tendon-trochlear groove (PT-TG) was measured. On CT images, the distance between the tibial tuberosity-trochlear groove (TT-TG) was measured. Additionally, the distance from the tibial tubercle-Roman arch (TT-RA), the sulcus angle (SA), the trochlear depth (TD), the lateral trochlear inclination (LTI), and the trochlear facet asymmetry (TFA) were measured on both MRI and CT images.Results:The TT-TG measured on CT [(20.47±4.42) mm] was significantly greater than that on MRI [(17.89±4.23) mm] ( t = -4.047, P < 0.001). The TT-RA [(24.28±4.27) mm], TD [2.95 (2.36, 4.08) mm], LTI (15.4°±3.85°), and TFA [0.42 (0.38, 0.49)] measured on CT were all significantly greater than those on MRI [(21.34±3.99) mm, 2.52 (1.64, 2.98) mm, 14.11°±3.58°, 0.38 (0.34, 0.44)] ( P < 0.001). The SA measured on CT (151.30°±6.74°) was significantly less than that measured on MRI (159.06°±5.40°) ( P < 0.001). The intra-observer ICC values for all indicators were greater than 0.9, and the inter-observer ICC values greater than 0.85. Conclusions:There are differences between CT and MRI in each indicator in evaluation of acute patellar dislocation in adolescents. The PT-TG measured on MRI and the TT-RA measured on CT can better evaluate the tibial tubercle lateralization; the indicators for trochlear dysplasia measured on MRI respond better to the severity of trochlea dysplasia than those on CT.
