Department of Large Animal Clinical Sciences and Comparative Medicine, College of Veterinary Medicine, University of Tennessee, Knoxville, TN, USA.
Vet Rec. 2012 Jun 16;170(24):621. doi: 10.1136/vr.100350. Epub 2012 May 4.
The urethral fold of 30 mares was split transversely into dorsal and ventral shelves, and the ventral shelf was used to help create a urethral extension. The dorsal shelf was stretched caudally and sutured to the roof of the extension so that it covered at least the cranial half of the extension. For 20 mares, a relaxing, vaginal incision was created cranial to the external urethral orifice to enable the dorsal shelf to be retracted further caudally. Ten of the 30 mares (33.3 per cent) developed a defect, but none developed a defect in that portion covered by the dorsal shelf of the urethral fold. Two of the 30 mares (6.7 per cent) developed a defect so small that the defect could be detected only by inserting a dye, under pressure, into the tunnel. The total number of mares that developed only a grossly visible and palpable defect was eight of 30 (26.6 per cent). Four of the 10 mares that did not receive the relief incision and six of 20 mares that did receive the relief incision developed a defect in the extension. Modifying the McKinnon technique by transversely splitting the urethral fold and retracting the dorsal half helps prevent a defect from forming in the cranial portion of the extension. The dorsal shelf can be retracted further caudally by creating a relief incision on the floor of the vagina.
将 30 匹母马的尿道褶横向分为背侧和腹侧支架，然后使用腹侧支架来帮助创建尿道延伸。背侧支架向尾侧拉伸并缝合到延伸的顶部，以便覆盖延伸的至少头侧半部。对于 20 匹母马，在尿道外口的颅侧创建一个松弛的阴道切口，以使背侧支架能够进一步向尾侧缩回。在 30 匹母马中，有 10 匹（33.3%）出现了缺陷，但没有一只有缺陷的部分是被尿道褶的背侧支架覆盖的。在 30 匹母马中，有 2 匹（6.7%）出现了很小的缺陷，只有通过在压力下将染料插入隧道才能检测到缺陷。只有 8 匹（26.6%）母马出现了明显可见和可触及的缺陷。在没有接受缓解切口的 10 匹母马中有 4 匹，在接受缓解切口的 20 匹母马中有 6 匹在延伸部位出现了缺陷。通过横向分裂尿道褶并缩回背侧半部分来修改 McKinnon 技术有助于防止在延伸的颅侧部分形成缺陷。通过在阴道底部创建一个缓解切口，可以进一步向尾侧缩回背侧支架。
