A biomechanical study on various suture techniques for torn meniscus was carried out in 45 lateral menisci of the hog knee which is closely similar to human knee. Longitudinal tear of the meniscus was produced and sutured with three commonly avsilable methods, vertical, horizontal, and knot-end, and the primary stability of each specimen was tested with tensometer (Instron, model No. 1115, Kyowa, Japan). The mean value of tearing stress test was 70.30±7.3N in the vertical suture group, 45.18±15. 3 N with significant variation (minimum 27.0 N to maximum 68.6 N) in the horizontal suture group and 19.0±6.2N in the knot-end suture group. This results indicated that the holding power of the suture is the highest in the vertical suture group and the lowest in the knot-end suture group. An additional biomechanical test using a stainless steel wire suture showed that the mean tearing stress of the vertical suture and horizontal suture was 184.1±21.6N and 41.7±13.7N respectively, which showed that the stability of vertical suture was about 4.5 times stronger than that of horizontal suture.