| Summary: | 碩士 === 國立成功大學 === 醫學工程研究所碩博士班 === 91 === The purpose of this study were (1) to create a three-dimensional kinematic model to evaluate the thumb motion in the activities of daily living (ADLs); (2) to compare differences of carpometacarpal (CMC) joint angles computed from two kinematic models based on third metacarpal and the radial bone, respectively; and (3) to investigate the range of motion of three thumb joints in ADLs. A motion analysis system was used to capture the thumb motion and Eulerian angles were used to represent joint motion.
Sixteen health subjects participated in this study. Six different ADLs tasks, tip pinch, palm pinch, lateral pinch, cylinder grip, spherical grip, and power grip, were evaluated. The thumb motion pattern, range of motion, and extreme functional joint angles were calculated. By statistic analysis, their differences between six ADLs were compared.
In thumb motion pattern, we found that all three thumb joints started to rotate from the neutral position at the same time in most activities. Significant interphalangeal (IP) flexion, and abduction metacarpophalangeal (MP) and CMC joints were found when holding the objects in most ADLs, except lateral pinch and power grip. Surprisingly, we didn’t find highly significant correlation coefficients between phalanx length and extreme functional angles and range of motion in ADLs. The CMC joint angle showed significant differences between two different kinematic models. The difference of CMC joint between two kinematic models showed the greatest differences in power grip among ADLs due to large amount of skin gliding on the styloid process. Examining the range of motion of three thumb joints in ADLs, the IP joint flexion plays an important role in performing most of tasks, especially in grip activities.
From our study, we had been clearly described the characteristics of the thumb joints motion patterns. The joint motion database in the thumb in ADLs could be applied in evaluating the thumb function loss in the patient and also could provide some references in designing therapeutic programs.
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