Objective:To introduce an innovative simulation training system of liposuction and compare the effect of the traditional training method with this system in the liposuction training for medical students.Methods:Thirty medical postgraduates (18 males and 12 females, aged 22 to 30 years) at Peking Union Medical College without liposuction experiences were selected. All the participants were randomly divided into two groups. In the traditional training group, the trainees were trained on the phantom, while the teachers gave explanations and demonstrations. In the simulation training system group, the trainees were trained by themselves on the simulation training system. Before and after the training, the two groups were required to perform a liposuction simulation test on the simulated training system. The resistance of liposuction cannula, the acceleration of liposuction cannula and the uniformity degree of operation of the two groups were recorded, and the differences in the training effects between the two groups were compared. R 3.5 and Python 3.7 were used for analysis. Application of the t test for measurement data was in accordance with normal distribution, and the results were expressed as Mean±SD deviation. Application of Wilcoxon signed-rank test or Wilcoxon rank sum test for the measurement data did not conform to the normal distribution. The results were expressed as M( P25, P75). P< 0.05 indicated statistical differences. Results:After the training, the area of liposuction in the traditional training group was more moderate than that before the training [skewness: -0.22(-0.38, -0.14) vs. -0.07(-0.24, 0.02)( V=20, P=0.022); kurtosis: 2.32(2.09, 2.58) vs. 1.96(1.90, 2.00)( V=112, P=0.002)]. After training, the number of times of lateral resistance[7.0(3.5, 13.5) vs. 0(0, 0)( V=111.5, P=0.004)] and acceleration [7.0(5.0, 17.5) vs. 3.0(2.0, 12.5)( V=102, P=0.002)] over-threshold were significantly reduced, the angle of liposuction coverage [131.18°(117.71°, 137.88°) vs. 169.89°(162.96°, 180.00°)( V=0, P<0.001)] was significantly improved, and the area of liposuction [skewness: -0.17(-0.33, 0.03) vs. -0.01(-0.13, 0.06)( V=21, P=0.026); kurtosis: 2.35(2.08, 2.50) vs. 1.94(1.83, 2.00)( V=118, P<0.001)] was more evenly distributed. The differences before and after training were analyzed between the simulation training system group and the traditional training group. The simulation training system group was superior to the traditional training group in the number of times of lateral resistance[-7.5±7.4 vs.-1.4±9.0 ( t=111.5, P=0.026)], the number of times of acceleration [-3.0(-6.5, -2.0) vs. -1.0(-4.0, 2.0)( W=156.5, P=0.035)] and the angle of coverage[(-40.24±18.88)° vs. (-11.10±25.54)° ( t=3.553, P<0.001)]. Conclusions:Simulation training system is an effective method in liposuction training to enhance the skills of trainees.

Objective:To introduce an innovative simulation training system of liposuction and compare the effect of the traditional training method with this system in the liposuction training for medical students.Methods:Thirty medical postgraduates (18 males and 12 females, aged 22 to 30 years) at Peking Union Medical College without liposuction experiences were selected. All the participants were randomly divided into two groups. In the traditional training group, the trainees were trained on the phantom, while the teachers gave explanations and demonstrations. In the simulation training system group, the trainees were trained by themselves on the simulation training system. Before and after the training, the two groups were required to perform a liposuction simulation test on the simulated training system. The resistance of liposuction cannula, the acceleration of liposuction cannula and the uniformity degree of operation of the two groups were recorded, and the differences in the training effects between the two groups were compared. R 3.5 and Python 3.7 were used for analysis. Application of the t test for measurement data was in accordance with normal distribution, and the results were expressed as Mean±SD deviation. Application of Wilcoxon signed-rank test or Wilcoxon rank sum test for the measurement data did not conform to the normal distribution. The results were expressed as M( P25, P75). P< 0.05 indicated statistical differences. Results:After the training, the area of liposuction in the traditional training group was more moderate than that before the training [skewness: -0.22(-0.38, -0.14) vs. -0.07(-0.24, 0.02)( V=20, P=0.022); kurtosis: 2.32(2.09, 2.58) vs. 1.96(1.90, 2.00)( V=112, P=0.002)]. After training, the number of times of lateral resistance[7.0(3.5, 13.5) vs. 0(0, 0)( V=111.5, P=0.004)] and acceleration [7.0(5.0, 17.5) vs. 3.0(2.0, 12.5)( V=102, P=0.002)] over-threshold were significantly reduced, the angle of liposuction coverage [131.18°(117.71°, 137.88°) vs. 169.89°(162.96°, 180.00°)( V=0, P<0.001)] was significantly improved, and the area of liposuction [skewness: -0.17(-0.33, 0.03) vs. -0.01(-0.13, 0.06)( V=21, P=0.026); kurtosis: 2.35(2.08, 2.50) vs. 1.94(1.83, 2.00)( V=118, P<0.001)] was more evenly distributed. The differences before and after training were analyzed between the simulation training system group and the traditional training group. The simulation training system group was superior to the traditional training group in the number of times of lateral resistance[-7.5±7.4 vs.-1.4±9.0 ( t=111.5, P=0.026)], the number of times of acceleration [-3.0(-6.5, -2.0) vs. -1.0(-4.0, 2.0)( W=156.5, P=0.035)] and the angle of coverage[(-40.24±18.88)° vs. (-11.10±25.54)° ( t=3.553, P<0.001)]. Conclusions:Simulation training system is an effective method in liposuction training to enhance the skills of trainees.