[Biomechanical study of flexor tendon and finger motor function].

In order to provide data for clinical approach to Hand-functional rehabilitation, we conducted this study on the relationships among flexor tendon load, tendon excursion and finger joint angle. Using the dynamic biomechanical test, three-dimension motion image analysis and computer analysis, we investigated eight intact normal male cadavers, hand mechanics of flexor tendon load, tendon excursion and joint angle. The results showed that, at the time when the top of finger touched the palm, the mean tendon load of flexor digitorum profundus(FDP) tendon was 7.9 N, the mean tendon excursion 43.4 mm, the mean total range of motion 237.0 degree. When the top of finger touched the palm, the mean tendon load of flexor digitorum superficial(FDS) tendon was 8.9 N, the mean tendon excursion 38.5 mm, and the mean total range of motion 206.3 degree. These findings demonstrated that there are some curvilinear relationships between flexor tendon load, tendon excursion and finger joint motion. When we flex our fists, the proximal interphalangeal(PIP) joint plays an important role in both FDP and FDS tendon.