Brownhill James R, Mozzon Jeremy B, Ferreira Louis M, Johnson James A, King Graham J W
Department of Biomedical Engineering, The University of Western Ontario, Ontario, Canada.
J Shoulder Elbow Surg. 2009 Jan-Feb;18(1):27-32. doi: 10.1016/j.jse.2008.03.008.
A better understanding of the morphology of the proximal ulna should permit the development of ulnar component designs which have an improved fit to the native bone, thus leading to more accurate implant positioning. Computed-tomography (CT) scans of 31 cadaveric proximal ulnae were analyzed using computer aided design software to determine the shape of the medullary canal relative to the articular surface. The diameter, curvature, cross-sectional centroid position, and coronal and sagittal angulation of the ulnar canal were all calculated with respect to the center of the greater sigmoid notch. Posterior and lateral offsets increased distally from the articulation center, and the mean diameter of the canal was larger in males than in females (P < .05). The average valgus angulation was 8.0 +/- 4.0 degrees for males and 7.2 +/- 3.1 degrees for females (P = .6). Longer stemmed ulnar implants may require a modular design to meet anatomic constraints during implant positioning.
对尺骨近端形态有更深入的了解，应有助于开发与天然骨更贴合的尺骨假体设计，从而实现更精确的植入物定位。使用计算机辅助设计软件分析了31具尸体尺骨近端的计算机断层扫描（CT），以确定髓腔相对于关节面的形状。相对于大乙状窦切迹中心，计算了尺骨髓腔的直径、曲率、横截面质心位置以及冠状面和矢状面角度。后偏移和侧偏移从关节中心向远端增加，男性髓腔的平均直径大于女性（P <.05）。男性平均外翻角度为8.0±4.0度，女性为7.2±3.1度（P =.6）。较长柄的尺骨植入物可能需要模块化设计，以满足植入物定位过程中的解剖学限制。
