Reliability and Stability of EOSTM 3D Imaging System in Diagnosing Recurrent Patellar Dislocation
Objective To explore the reliability and stability of EOSTM 3D imaging system in diagnosing recurrent patellar dislocation.Methods The imaging data of 22 patients(26 knees)with recurrent patellar dislocation treated in Sports Medicine Center of Xi'an Jiaotong University Affiliated Honghui Hospital from March 2022 to March 2023 were retrospectively analyzed.Two radiologists simultaneously performed EOSTM to obtain the patient's force line measurement values of the lower extremities.The 3D model of the image images was reconstructed using sterEOS software,and the tibial tubercle trochlear groove(TT-TG)values were measured in the 3D model.The time and relevant parameters required for each measurement were recorded.All patients underwent routine knee CT scan and 3D reconstruction at the same time.The TT-TG values measured by EOSTM 3D image and CT scan were compared,and the reliability and stability of the measured data were studied by consistency check and Bland-Altman figure.Results There was no significant difference in the length of femur and tibia,the varus angle of knee joint and the rotation angle of femur and tibia between different measurers when measuring the lower limb force line of EOSTM in all patients(P＞0.05).The measurement time of conventional lower limb CT scan and 3D reconstruction was(21.8±3.2)min(13-29 min),while the EOSTM 3D measurement time was(6.3±1.8)min(4-11 min),with statistically significant differences(t=12.693,P＜0.001).The correlation coefficient of TT-TG measured by EOSTM 3D between the two doctors and conventional CT were 0.791,0.843,and the consistency between the two methods was good.The Bland-Altman plot showed that 96.2％(25/26)and 92.3％(24/26)of the points of the two measurers were within the±1.96 standard deviation range,respectively,indicating that the TT-TG values measured by conventional CT 3D reconstruction and EOSTM 3D had good agreement and stability.Conclusion The use of EOSTM 3D imaging system to measure TT-TG values in patients with recurrent patellar dislocation has good reliability and repeatability.Its advantages of short examination time and low radiation will provide a fast,reliable and stable method for clinicians to evaluate the lower limb force line data of such patients.
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