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Batbayar Khuyagbaatar,이상진,천마로,Temuujin Batbayar,Danaa Ganbat,김윤혁 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.5
Instability of the distal radioulnar joint (DRUJ) is a common clinical problem due to a fall on the outstretched hand or unexpected forcible wrist rotations. Although there are many surgical treatments available for DRUJ instabilities, many of injuries can be managed conservatively, such as the wrist-wearing DRUJ stabilizer to provide the stability of the joint. However, there is a lack of research regarding use of the stabilizer on wrist joint biomechanics. In this study, a finite element (FE) model of the forearm was developed to investigate the effects of the stabilizer on DRUJ stability. The effect of the stabilizer on joint stability was quantified by laxity and rotation tests. Our results showed that use of a stabilizer may help to provide stability for the joint by reducing dorsal-volar translation of the radius and ulna, which might be helpful to prevent reoccurrence of a wrist joint injury related with instability.
Yong Chul Choi,Batbayar Khuyagbaatar,Maro Cheon,Temuujin Batbayar,SuKyoung Lee,Yoon Hyuk Kim 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.6
This study aimed to analyze and compare the hip, knee, and elbow joint movements during the double poling (DP) technique in cross-country skiing using a wearable inertial measurement unit (IMU) sensor on a real snow skiing track. Six national players (NP) and five college players (CP) participated in this study. The joints angles were calculated using the data from IMU sensors on a 145 m skiing course with 10° slope using the DP technique. In addition, the parameters of the DP phase were estimated. Then, all parameters were compared between the NP and CP groups. The hip and knee joint angles in the NP groups were significantly larger than the CP groups. However, there was no intergroup difference in elbow joint range of motion (ROM). Moreover, the cycle length and cycle velocity was higher in the NP group than the CP group. The results showed that the NP group had higher speed and longer cycle length with greater flexion angles in the hip and knee joints. The wearable IMU sensor was used to analyze the motions during DP skiing on the snow skiing slope, which can provide more realistic detailed analysis of the skiing movements. This study provides the comparison analysis of the main parameters between the two different skilled skiers groups, which may help coaches and players improve skiing performance.