Szebenyi B, Dieppe P A, Buckland-Wright J C
Division of Anatomy and Cell Biology, United Medical and Dental School of Guy's Hospital, London, UK.
Surg Radiol Anat. 1995;17(1):79-81. doi: 10.1007/BF01629506.
Recent clinical and epidemiological studies have emphasised the importance of the patello-femoral joint (P-FJ) in osteoarthritis. X-ray examination of this joint for joint space width (JSW) assessment using the standard medio-lateral view is difficult. In 26 femora, the mean angle of inclination between the medial and lateral condyles measured at their inferior and anterior surfaces, relative to a line passing between the medial and lateral femoral epicondyles, was used to define the optimum alignment of the x-ray tube. The results showed that for medio-lateral radiography of the P-FJ, the central ray of the x-ray beam should be directed cranially, in a upward projection by 5 degrees and then anteriorly by 4 degrees, resulting in superimposition of the inferior and anterior condylar surfaces respectively. The value of these angles was confirmed by radiographs of the 26 femora and 10 post mortem joints. The margins for joint space width measurement were identified by embedding lead balls, within the cartilage of the cadaveric knees, and were defined as the median vertical ridge of the patella and the middle of the patella groove on the femur.
近期的临床和流行病学研究强调了髌股关节（P-FJ）在骨关节炎中的重要性。使用标准的内外侧位片对该关节进行关节间隙宽度（JSW）评估的X线检查存在困难。在26个股骨中，以内侧和外侧髁的下表面和前表面相对于股内侧和外侧髁间连线所测量的平均倾斜角度，用于确定X线球管的最佳对准。结果显示，对于P-FJ的内外侧位X线摄影，X线束的中心线应向头侧倾斜，向上投影5度，然后向前倾斜4度，从而分别使髁的下表面和前表面重叠。这些角度值在26个股骨和10个尸体关节的X线片上得到了证实。通过在尸体膝关节软骨内嵌入铅球来确定关节间隙宽度测量的边界，其定义为髌骨的正中垂直嵴和股骨上髌骨沟的中点。
