Method 120 trapeziometacarpal joint surfaces were measured with vernier caliper,the arc length and the curveture of the surface were calculated.

• 方法成年尸体上肢60例(120侧),分离第一掌骨和大多角骨并在关节面建立测点,游标卡尺测量,计算关节面弧长和曲率。