Department of Orthopaedic Surgery, Incheon St. Mary's Hospital, College of Medicine, Catholic University, Bupyeong 6-dong, Bupyeong-gu, Incheon, 403-720, South Korea.
Knee Surg Sports Traumatol Arthrosc. 2012 Jan;20(1):179-86. doi: 10.1007/s00167-011-1712-9. Epub 2011 Oct 19.
Plain radiographs are frequently used to select appropriately sized meniscal allografts, of which the width and length cannot be always perfectly matched. The objective of this study was to decide which of these dimensions should be matched with a more priority considering proper position of the lateral meniscal transplants.
The positions of 34 lateral, fresh-frozen meniscal allografts, transplanted using the central bone bridge method, were evaluated by magnetic resonance imaging (MRI) 2 days after surgery. A size mismatch was defined as a difference between preoperative radiographic size and a real dimension of the transplants. The lateral subluxation of the mid-body on the coronal plane and the anterior and posterior horn positions on the sagittal plane were estimated on the MRIs. It was evaluated whether size mismatches were associated with the meniscal subluxation beyond articular cartilage margin on each plane.
The mean lateral subluxation of the mid-body on the center of coronal sections was 1.7 ± 1.8 mm. The anterior and posterior horns were located 2.0 ± 2.1 mm and -3.8 ± 2.7 mm from the articular edge, respectively, in the center of sagittal images. Lateral subluxation was significantly associated with width mismatch (r = 0.415-0.486, P < 0.05), but length mismatch was not significantly correlated with the anterior or posterior horn position on sagittal images (n.s.).
The results of this study suggest that width matching using plain radiographs would be more reliable than length matching when it is sought to assure adequate positioning of meniscal transplants, if both dimensions cannot be simultaneously matched.
II.
在选择半月板同种异体移植物时，常使用普通 X 线片来选择合适大小的移植物，但宽度和长度并不总能完全匹配。本研究的目的是确定在不能同时匹配两个维度的情况下，应该优先考虑哪个维度，以确保外侧半月板移植物的正确位置。
对 34 例采用中央骨桥法移植的外侧新鲜冷冻半月板同种异体移植物，在术后 2 天进行磁共振成像（MRI）检查。将术前 X 线片测量的大小与移植物的实际尺寸之间的差异定义为大小不匹配。在冠状面评估中体部外侧的半脱位，在矢状面评估前角和后角的位置。评估每个平面上的半月板超出软骨边缘的半脱位是否与大小不匹配有关。
冠状面中心截面的体部外侧半脱位的平均距离为 1.7±1.8mm。在矢状面中心图像中，前角和后角分别距关节缘 2.0±2.1mm 和-3.8±2.7mm。外侧半脱位与宽度不匹配显著相关（r=0.415-0.486，P<0.05），但长度不匹配与矢状图像上前角或后角的位置无显著相关性（n.s.）。
本研究结果表明，如果不能同时匹配两个维度，则在寻求确保半月板移植物的适当位置时，使用普通 X 线片进行宽度匹配比长度匹配更可靠。
II 级。
