Graham Kraig S, Goitz Robert J, Kaufmann Robert A
Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Kaufmann Medical Building, 3471 Fifth Avenue, Suite 1011, Pittsburgh, PA 15213 USA.
Hand (N Y). 2014 Dec;9(4):522-8. doi: 10.1007/s11552-014-9605-2.
The distal interphalangeal (DIP) joints of the hand are highly susceptible to osteoarthritis and trauma. Surgical treatment options mandate accurate characterization of their osseous anatomy; however, there are few studies that describe this. We describe the curvatures of the DIP joints by measuring the bone morphology using advanced imaging and modeling methods.
The fingers of 16 right hand fresh frozen human cadavers were analyzed. Fingers showing signs of DIP joint arthritis were excluded. The fingers were scanned using microtomography (microCT). Measurements of the bony morphology were made using models created from the scans.
In each finger, there is no statistically significant difference between the radii of curvature of the ulnar and radial condyles of the middle phalanx head. Conversely, the radius of curvature of the distal phalanx ulnar groove is significantly greater than that of the radial groove. The radii of curvature of the groove of the distal phalanx and the condyles of the middle phalanx displayed nonconformity with disparity increasing from the index to small fingers. Remarkably, the radius of curvature of the distal phalanx central ridge and the mean radius of the middle phalanx condyles are essentially the same.
The purpose of this study is to gain better insight into the DIP joints of the hand. The asymmetry between the distal phalanx grooves and the middle phalanx condyles suggests that there may be a translational component to DIP joint motion. Our understanding of morphology may lend insight into the biomechanics and disease progression within the DIP joints.
手部远侧指间关节（DIP）极易患骨关节炎和遭受创伤。手术治疗方案要求准确描述其骨性解剖结构；然而，很少有研究对此进行描述。我们通过使用先进的成像和建模方法测量骨形态来描述DIP关节的曲率。
对16具右手新鲜冷冻人体尸体的手指进行分析。排除显示有DIP关节关节炎迹象的手指。使用显微断层扫描（microCT）对手指进行扫描。利用扫描创建的模型对骨形态进行测量。
在每个手指中，中节指骨头尺侧和桡侧髁的曲率半径之间无统计学显著差异。相反，远节指骨尺侧沟的曲率半径明显大于桡侧沟的曲率半径。远节指骨沟和中节指骨髁的曲率半径显示出不一致性，从示指到小指差异逐渐增大。值得注意的是，远节指骨中央嵴的曲率半径与中节指骨髁的平均半径基本相同。
本研究的目的是更好地了解手部的DIP关节。远节指骨沟和中节指骨髁之间的不对称表明DIP关节运动可能存在平移成分。我们对形态学的理解可能有助于深入了解DIP关节内的生物力学和疾病进展。
