Mutsuzaki H, Fujie H, Nakajima H, Fukagawa M, Nomura S, Sakane M
Department of Orthopaedic Surgery, Ibaraki Prefectural University of Health Sciences, 4669-2 Ami Ami-Machi, Inashiki-gun, Ibaraki 300-0394, Japan.
Biomechanics Laboratory, Faculty of System Design, Tokyo Metropolitan University, 6-6 Asahigaoka, Hino, Tokyo 191-0065, Japan.
Orthop Traumatol Surg Res. 2017 Apr;103(2):239-243. doi: 10.1016/j.otsr.2016.11.013. Epub 2017 Jan 10.
Calcium phosphate (CaP)-hybridized tendon grafts improved biomechanical function compared with untreated grafts after single-bundle (SB) anterior cruciate ligament (ACL) reconstruction. The purpose of this study was to compare the biomechanical function between anatomic double-bundle (DB) and single-bundle (SB) ACL reconstructions using CaP-hybridized tendon grafts at 6 months postoperatively in goats.
We hypothesized that the postoperative biomechanical function in the DB group will be better than that in the SB group.
Knee kinematics and in situ forces in the grafts under applied anterior tibial load (ATL) of 50N and internal tibial torque (ITT) of 2.0 Nm at full extension, and 60° and 90° of knee flexion, and the histology of the tendon-bone interface were compared between the DB group (n=6) and SB group (n=6).
The in situ forces under ATL in the DB group at full extension and 90°of knee flexion were greater than those in the SB group. The in situ forces under ITT in the DB group at full extension and 60°of knee flexion were greater than those in the SB group. The in situ forces on the posterolateral bundle of the grafts under ATL and ITT in the DB group at full knee extension were greater than those on the posterior half of the grafts in the SB group. The histology did not differ significantly between the groups.
Although CaP-hybridized tendon grafts were used in both groups, the in situ forces under ATL and ITT in the DB group were greater than those in the SB group at 6 months postoperatively. The posterolateral bundle of the grafts in the DB group acted effectively against both ATL and ITT at full extension. The tendon-to-bone healing was similar in both groups.
Controlled laboratory study. Level 2.
在单束（SB）前交叉韧带（ACL）重建术后，与未处理的移植物相比，磷酸钙（CaP）杂交肌腱移植物改善了生物力学功能。本研究的目的是比较山羊术后6个月时使用CaP杂交肌腱移植物进行解剖双束（DB）和单束（SB）ACL重建之间的生物力学功能。
我们假设DB组术后生物力学功能将优于SB组。
比较DB组（n = 6）和SB组（n = 6）在50N前向胫骨负荷（ATL）和2.0 Nm胫骨内扭矩（ITT）作用下，膝关节完全伸展、屈曲60°和90°时移植物的膝关节运动学和原位力，以及肌腱-骨界面的组织学情况。
DB组在完全伸展和膝关节屈曲90°时ATL下的原位力大于SB组。DB组在完全伸展和膝关节屈曲60°时ITT下的原位力大于SB组。DB组在膝关节完全伸展时ATL和ITT下移植物后外侧束的原位力大于SB组移植物后半部分的原位力。两组组织学差异不显著。
尽管两组均使用了CaP杂交肌腱移植物，但术后6个月时DB组在ATL和ITT下的原位力大于SB组。DB组移植物的后外侧束在完全伸展时对ATL和ITT均有有效作用。两组肌腱-骨愈合情况相似。
对照实验室研究。2级。
