Cook, L., HHAAM, V. V., LM, L., A, P., & MF, G. (2006). Vasectomy occlusion techniques for male sterilization. The Cochrane Library, (3), 1–33.
Most of the studies that looked at vasectomy methods were small, not done well, or had poor reports. Therefore, we cannot say if the methods work well, are safe or are liked by men. Vasectomy with fascial interposition worked better than simply cutting and tying the vas, but the surgery was more difficult. More and better research is needed on vasectomy methods.