鸡爪5种屈肌腱中心缝合方法的即刻生物力学比较

目的:比较5种临床常用肌腱中心缝合方法的即刻生物力学特性,为临床肌腱修复提供参考。方法:成年AA白羽鸡爪50只,随机分为5组。锐刀横断Ⅱ区趾深屈肌肌腱,分别用改良Kessler法、津下(Tsuge)法、Cruciate法、改良Tsuge法、Tang法进行中心缝合,不做周边修复。缝合后立即取下肌腱,用冰冻卡具固定两端,在生物力学材料动态力学性能测试仪进行拉伸-断裂测试。测定极限载荷、应变,记录断裂方式,计算出各组肌腱的韧度、极限拉伸强度、弹性模量和断裂功耗并进行统计学分析。结果:Tang法组的极限载荷、极限拉伸强度、韧度和断裂功耗均大于其他4种方法(P0.05),改良Kessler法组各参数均小于其他4种方法(P0.05)。结论:临床中最常用的改良Kessler法操作简单,缝合后外观光滑,组织反应轻,但其缝线股数少,抗拉强度较低,有待进一步增加强度。Tang法缝合的各生物力学性能优于其他方法,高抗拉强度可以满足术后早期功能锻炼,为一种可靠的肌腱修复方法。     

几种屈肌腱缝合方法的即刻生物力学比较

目的比较几种临床常用肌腱缝合方法的即刻生物力学特性,为临床肌腱修复提供参考。方法成年AA白羽鸡爪60只,随机分为6组。锐刀横断Ⅱ区趾深屈肌肌腱,分别用改良Kessler法、改良Kessler加腱周连续缝合法、Cruciate法、滓下法,改良津下法,Tang法进行修复。缝合后立即取下肌腱进行拉伸—断裂测试。测定极限载荷、应变,计算出各组的肌腱韧度、极限拉伸强度、弹性模量和断裂功耗,并记录手术操作时间和断裂方式,进行统计学分析。结果Tang法组的极限载荷、极限拉伸强度、韧度和断裂功耗均大于其他五种方法（P〈0．05）,改良Kessler法的各组参数均小于其他五种方法（P〈0．05）。操作时间以改良Kessler法和Tsuge法最小（P〈0．05）。结论改良Kessler加腱周连续缝合法操作简单、强度可观、生物力学特性好、吻合端光滑,是临床中最常用的肌腱修复法。Tang法抗拉强度高,可以胜任术后早期功能锻炼,为一种可靠的肌腱修复方法。     

Biomechanical Analysis of a New Eight-Strand Suture for Flexor Tendon Repair

Background  The placement of multistrand sutures during flexor tendon repair requires complicated surgical skills; such suturing is difficult. We developed a new, simpler eight-strand suture, which we term the Yoshizu cross-lock. This reduces the numbers of suture passages through the tendons, as well as the numbers of knots. Methods  Fourteen porcine flexor tendons were transected and repaired using the Yoshizu cross-lock system; no peripheral sutures were placed. Our system is a modification of the published, exposed cross-lock repair method that employs a 4–0 monofilament nylon two-strand line and two needles. The repaired tendons were subjected to linear, noncyclic load-to-failure tensile testing. The initial gap, the 2-mm gap force, and the ultimate strength were measured. Results  The initial gap force was 12.6 ± 5.6 Newtons (N), the 2-mm gap force was 33.9 ± 10.9 N, and the ultimate strength was 70.1 ± 17.0 N. All tendons subjected to Yoshizu cross-lock repair failed due to suture rupture rather than pullout. Conclusions  Our biomechanical study revealed that Yoshizu cross-lock repair had sufficient tensile strength but was associated with wide variation in the 2-mm gap load (standard deviation = 10.9 N). This study is clinically relevant, showing that the Yoshizu cross-lock repair combined with peripheral suturing may allow a repaired flexor tendon to withstand the stresses encountered during early active mobilization. This simple eight-strand technique will be particularly useful to surgeons who commonly employ the cross-lock stitch for primary flexor tendon repair following early mobilization.