Department of Orthopedic Surgery, Korea University College of Medicine, Guro Hospital, Seoul, Republic of Korea.
Knee Surg Sports Traumatol Arthrosc. 2011 Nov;19(11):1890-4. doi: 10.1007/s00167-011-1498-9. Epub 2011 Apr 7.
The purposes of this study were (1) to determine normal anterior and posterior knee laxity in a healthy young adult (20-30 years old) Korean population, (2) to compare knee laxity between the male and female populations, (3) to investigate whether generalized joint laxity affects anterior and posterior knee laxity, (4) to determine side-side differences between right and left knees, and thus, to determine normal values of side-side differences.
Normal values of anterior and posterior knee laxity were measured in 100 healthy volunteers (50 men and 50 women) aged between 20 and 30 years. Stress radiography using a Telos device was performed in 20 and 70° of knee flexion for 134N anterior and posterior loads. Anterior and posterior tibial displacements relative to the femur condyle were measured using a computerized system.
In the 100 subjects (200 knees), anterior knee laxity was greater at 20° of flexion with a mean of 4.9 ± 2.3 mm (P < 0.05) and posterior knee laxity was greater at 70° of flexion with a mean of 4.6 ± 2.7 mm (P < 0.05). The mean side-side difference was 1.4 ± 0.9 mm (range, -3 to +3). Women had greater anterior laxity (P < 0.05) than men at both 20 and 70° of flexion, but posterior laxity was not different (ns). Generalized joint laxity was greater in women compared to men (P < 0.05). Subjects with generalized joint laxity had greater laxity than normal populations in both 20 and 70° of flexion (P < 0.05). Side-side differences between right and left knees were not significantly different in women and men or between subjects with normal and generalized joint laxity (ns).
This study suggests that the Korean population exhibits a wide range of normal anterior and posterior knee laxity, but small side-side differences. Subjects with generalized laxity showed greater knee laxity than those without, but side-side differences were less than 3 mm in all subjects. Thus, clinical guideline that a side-side difference more than 3 mm of anterior knee laxity is abnormal can be applicable for the subjects with generalized laxity.
本研究的目的是：（1）确定健康的年轻成年人（20-30 岁）韩国人群中正常的前后膝关节松弛度，（2）比较男女人群的膝关节松弛度，（3）研究全身性关节松弛度是否会影响前后膝关节松弛度，（4）确定右膝和左膝之间的侧间差异，并因此确定侧间差异的正常值。
对 100 名年龄在 20 至 30 岁之间的健康志愿者（50 名男性和 50 名女性）进行了前后膝关节松弛度的正常值测量。使用 Telos 设备在 20°和 70°的膝关节弯曲下进行了应力射线照相术，以 134N 的前向和后向负荷进行。使用计算机化系统测量胫骨相对于股骨髁的前后位移。
在 100 名受试者（200 个膝关节）中，20°时的前膝关节松弛度更大，平均为 4.9 ± 2.3mm（P<0.05），70°时的后膝关节松弛度更大，平均为 4.6 ± 2.7mm（P<0.05）。平均侧间差异为 1.4 ± 0.9mm（范围，-3 至+3）。女性在 20°和 70°的膝关节弯曲时，前松弛度均大于男性（P<0.05），但后松弛度无差异（ns）。与男性相比，女性的全身性关节松弛度更大（P<0.05）。在 20°和 70°的膝关节弯曲时，全身性关节松弛的受试者的松弛度均大于正常人群（P<0.05）。女性和男性之间或全身性关节松弛和正常关节松弛的受试者之间，右膝和左膝之间的侧间差异均无统计学意义（ns）。
本研究表明，韩国人群的前后膝关节松弛度范围较宽，但侧间差异较小。全身性松弛的受试者的膝关节松弛度大于无全身性松弛的受试者，但所有受试者的侧间差异均小于 3mm。因此，对于全身性松弛的受试者，侧间差异超过 3mm 的前膝关节松弛度异常的临床指南可能适用。
