ACL/PCL reconstruction: the role of double-bundle PCL reconstruction

Our approach to combined anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL) injuries depends on the timing of the injury and concomitant ligament and bony pathology. In the acute setting (within 3 weeks), we prefer to perform single-bundle ACL and PCL reconstruction because we have seen consistently good results. However, chronic combined injuries do not fare as well because single-bundle PCL reconstruction in these injuries has not consistently corrected posterior laxity. Because of this clinical data, we now utilize a double-bundle PCL technique for knees with chronic, combined ligament deficiency with instability. This particular patient population has significant anterior, posterior, and, in many cases, posterior lateral laxity. Once the decision has been made to proceed with this procedure, attention to the technical details is critical to achieving good results. In this article, we will outline important general and specific technical details that will facilitate the procedure and optimize the clinical outcome.     

Complications in posterior cruciate ligament and posterolateral corner surgery

Posterior cruciate ligament (PCL) and posterolateral corner (PLC) injuries are complex injuries requiring specialized treatment. These technically demanding surgical procedures are performed less frequently than anterior cruciate ligament (ACL) reconstructions. Lack of experience in the evaluation and treatment of these injuries might lead to complications and suboptimal results. Complications associated with PCL and PLC surgeries include persistent laxity, osetonecrosis, neurovascular injury, compartment syndrome, motion loss, anterior knee pain, fractures, infection, and wound healing problems. A comprehensive preoperative evaluation, accurate diagnosis, well-planned and carefully executed surgical procedure, and supervised postoperative rehabilitation program might reduce the incidence of of complications associated with PCL and PLC surgical procedures.     

后交叉韧带指数在诊断前交叉韧带损伤中的临床价值研究

目的:测量后交叉韧带指数(posterior cruciate ligament index,PCLindex)并观察其与关节稳定性的关系,评估其诊断前交叉韧带(anterior cruciate ligament,ACL)断裂的临床价值。方法:在ACL完全断裂、部分断裂、完整的受试者膝关节正规MRI矢状位片上,测量其后交叉韧带止点的直线距离(X)和该直线到后交叉韧带弧顶的距离(Y),计算PCL指数(X/Y)。利用KT2000,在屈膝30°和90°位分别给于15磅、20磅、30磅和最大拉力,测量双侧胫骨前移的距离,计算双膝的位移差值。分析PCL指数与KT2000位移差值的相关性,评价PCL指数的临床诊断价值。结果:ACL完整患者的PCL指数为5.0953±0.6029,ACL部分断裂患者的PCL指数为3.5867±0.5276,ACL完全断裂患者的PCL指数为3.4217±0.5532。PCL指数与最大拉力时的KT2000位移差值呈负相关。结论:PCL指数可以作为前交叉韧带断裂的临床诊断参考指标。     

Comparing in vivo kinematics of anterior cruciate-retaining and posterior cruciate-retaining total knee arthroplasty

The purpose of this study was to compare knee kinematics in patients with bi-cruciate preserving total knee arthroplasty and posterior cruciate ligament (PCL) preserving total knee arthroplasty. Five knees received PCL-retaining arthroplasty and nine knees received both cruciate-retaining arthroplasty (ACL/PCL knees). We studied treadmill gait, stair stepping, and maximum flexion activities using lateral fluoroscopy and shape matching. For maximum flexion, the ACL/PCL knees showed 6 mm more posterior translation of the lateral condyle (p < 0.05). For the stair activity, posterior translations of the lateral condyle were significantly greater in the ACL/PCL knees from 30° to 70° flexion (p < 0.05). Both condyles in the ACL/PCL knees showed greater posterior translation in the stance and swing phases of gait than in the PCL knees (p < 0.05). Preserving both cruciate ligaments in total knee arthroplasty appears to maintain some basic features of normal knee kinematics in these activities.     

Surgical treatment of ACL/PCL/ medial-side knee injuries

The medial cruciate ligament (MCL), anterior cruciate ligament (ACL), and posterior oblique ligament (POL) frequently are injured by a combination of valgus and external rotation forces. Grade I or II MCL injuries alone or in combination with ACL or posterior cruciate ligament (PCL) injuries are treated nonoperatively, with cruciate ligament reconstruction delayed 3 to 6 weeks. Treatment of acute grade III ACL/PCL medial knee injuries remains controversial. Recommendations have included nonoperative treatment of the MCL and reconstruction of the ACL and PCL, acute reconstruction of the MCL and nonoperative treatment of the ACL, and treatment of all grade III injuries with acute repair. For chronic ACL/PCL/medial knee injuries, magnetic resonance imaging and examination under anesthesia are followed by endoscopic ACL/PCL reconstruction. Severe valgus laxity usually requires tightening of the MCL in addition to the posterior capsule, the posterior oblique area of the posteromedial capsule, and the midmedial capsular ligament. Thorough preoperative planning is essential to determine what procedures will be necessary for each patient.     

Simultaneous anterior and posterior cruciate ligament reconstruction in chronic knee instabilities: surgical concepts and clinical outcome

The purpose of this study was to evaluate the clinical results of simultaneous arthroscopically assisted reconstruction of anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL) using autogenous tendon grafts in chronic knee injuries. Nineteen patients (17 men and 2 women) with chronic multi-ligamentous injuries underwent one-stage ACL and PCL reconstruction. ACL, PCL and medial collateral ligament were reconstructed in seven knees, and ACL, PCL and posterolateral structure were reconstructed in two knees. Function of the operated knee was evaluated according to the International Knee Documentation Committee (IKDC) and Lysholm scale. Anterior and posterior knee laxity was examined with a KT-2000 arthrometer. Eighteen of 19 patients were able to return for follow-up and were evaluated objectively and subjectively. The average patient age at surgery was 30.5 years, and the average postoperative follow-up was 3.5 years. No patients showed loss of knee extension more than 5 degrees , while three patients revealed loss of knee flexion more than 16 degrees . The mean postoperative total anterior-posterior side-to-side difference was 1.9 +/- 1.5 mm at 20 degrees and 2.1 +/- 1.9 mm at 70 degrees . The average of the Lysholm score was 95.1 points at the final follow-up. At the IKDC evaluation, three patients were grade A, 11 were grade B, 3 were grade C, and 1 patient was grade D. The results showed the effectiveness and safety of one-stage reconstruction of combined ligamentous injuries of the knee that can adequately restore satisfactory stability.     

关节镜下应用LARS人工韧带同时重建前、后交叉韧带

目的 探讨关节镜下应用LARS人工韧带重建前交叉韧带(ACL)、后交叉韧带(PCL)同时损伤的方法及疗效. 方法 关节镜下同时重建13例ACL、PCL损伤的患者,重建材料采用LARS人工韧带.术后随访12～36个月,采用国际膝关节文件编制委员会(IKDC)韧带标准评价表和Lysholm膝关节功能评分表评估患膝功能,通过KT-1000检查膝关节前后松弛度.结果 术后无膝关节感染发生;均无伸膝受限,屈膝活动度105°～125°,平均117°.术后随访时IKDC评分:A类10例(77%),B类3例(23%).屈膝25°位KT-1000检查:双侧膝关节前向松弛度差异＜2 mm 12例,3～5 mm 1例;屈膝70°位检查:＜2 mm 12例,2～4 mm 1例.术前Lysholm膝关节功能评分为(63.8 ±2.9)分(49～69分),终末随访时为(91.1±2.7)分(88～95分),差异有统计学意义(P＜0.01). 结论 关节镜下同时重建膝关节ACL、PCL是目前治疗ACL、PCL同时损伤的一种微创、安全、有效的手术方法,近期疗效佳.     

Registration of cruciate ligament injuries in Norwegian top level team handball. A prospective study covering two seasons

All cruciate ligament injuries in the three upper divisions for men and women (3392 players) in Norwegian team handball in the 1989-90 and 1990–91 seasons were registered. A questionnaire was mailed to all injured players. Ninety-three cruciate ligament injuries were registered; 87 in the anterior cruciate ligament (ACL), and six in the posterior cruciate ligament (PCL). Among women, 1.8% were injured compared with 1.0% of the men. In the first division, the risk of being injured was considerably higher: 4.5% of the players had a cruciate ligament injury. There were 0.97 cruciate ligament injuries per 1000 playing hours in the three divisions taken together. Seventy-five per cent of the injuries occurred during games. Ninety-five per cent involved no contact between players. Activities in which the friction between shoe and floor was significant caused 55% of the injuries. Injuries caused by running into another player contributed to only 5% of the injuries. No significant differences were observed in injury incidence during matches between different types of floors (parquet, Pulastic and other synthetic sufaces).     

膝关节后交叉韧带合并后外复合体损伤重建术后步态分析

目的:通过对后交叉韧带(posteriorcruciateligament,PCL)和后外复合体损伤(posterolateralcorner,PLC)重建术后患者进行步态分析,动态评估重建术后的时间-距离指标、运动学指标和动力学指标。方法:2007年3月至2008年4月,收住后交叉韧带合并后外复合体损伤患者16例(实验组)并进行异体跟腱重建后交叉韧带以及异体胫前肌重建腘腓韧带手术,术前行外旋拨号测试、术后1年行步态分析测试和外旋拨号测试。并与对照组(16例健康志愿者)的步态分析结果进行比较。结果:实验组时间-距离指标和运动学指标与对照组均无显著性差异(P>0.05),而运动力学指标中患侧膝关节伸膝力矩占主导地位,与对照组有明显差异(P<0.01)。16例患者术前患侧外旋角度较对侧平均增大16.5±6.2度,重建术后1年,外旋拨号试验患侧较对侧外旋角度平均增大-4.4±7.8度,术前术后比较有显著性差异(P<0.01)。重建术后1年,实验组步态分析中膝关节最大外旋角度绝对值为14.1±15.7度,外旋拨号试验最大外旋角度绝对值为29.7±15.2度,二者之间存在直线相关关系(r=0.9671,P<0.05)。结论:后交叉韧带以及后外复合体重建术后1年,除屈膝力矩明显小于对照组外,患者步态基本达到正常。     

膝关节韧带联合损伤的关节镜治疗后康复护理效果分析

目的探讨关节镜下膝关节前交叉韧带、后交叉韧带、内侧副韧带、外侧副韧带、后外侧结构联合损伤的康复护理效果。方法2003年10月—2005年11月,采用关节镜下重建交叉韧带,修复或重建侧副韧带和后外侧结构治疗急性膝联合韧带损伤12例。术后早期等长肌力练习、早期完全负重、早期本体感觉练习、早期被动练习。出院后随诊并功能评分。结果12例均获得随访,随访时间6~24个月,平均14个月。Lysholm评分:优2例,良8例,可2例。关节稳定性良好,有2例腘绳肌腱重建者抽屉试验Ⅰ度阳性。膝关节屈曲超过120°者9例,90~120°者3例。结论膝关节联合韧带损伤关节镜手术治疗配合正确的康复护理可取得良好效果。     

Relative contribution of the ACL, MCL, and bony contact to the anterior stability of the knee

Ligaments and other soft tissues, as well as bony contact, all contribute to anterior stability of the knee joint. This study was designed to measure the in situ force in the medial collateral ligament (MCL), anterior cruciate ligament (ACL), posterolateral structures (PLS), and posterior cruciate ligament (PCL) in response to 110 N anterior tibial loading. The changes in knee kinematics associated with ACL deficiency and combined MCL+ACL deficiency were also evaluated. Utilizing a robotic/universal force-moment sensor system, ten human cadaveric knee joints were tested between 0° and 90° of knee flexion. This unique testing system is designed to determine the in situ forces in structures of interest without making mechanical contact with the tissue. More importantly, data for individual structures can be obtained from the same knee specimen since the robotic manipulator can reproduce the motion of the intact knee. The in situ forces in the ACL under anterior tibial loading to 110 N were highest at 15° flexion, 103 ± 14 N (mean ± SD), decreasing to 59.2 ± 30 N at 90° flexion. For the MCL, these forces were 8.0 ± 3.5 N and 38.1 ± 25 N, respectively. Forces due to bony contact were as high as 34.1 ± 23 N at 30° flexion, while those in the PLS were relatively small at all flexion angles. Combined MCL+ACL deficiency was found to significantly increase anterior tibial translation relative to the ACL-deficient knee only above 60° of knee flexion. These findings confirm the hypothesis that there is significant load sharing between various ligaments and bony contact during anterior tibial loading of the knee. For this reason, the MCL and osteochondral surfaces may also be at significant risk during ACL injury. Received: 29 December 1997 Accepted: 16 July 1998     

膝关节韧带损伤的MRI诊断价值

目的:探讨膝关节韧带损伤的MRI表现特点。方法:回顾性分析50例损伤的膝关节韧带的MRI表现。结果:本组50例87根韧带损伤,其中前交叉韧带15根(17.2%),后交叉韧带18根(26.7%),外侧副韧带15根(17.2%),内侧副韧带39根(44.8%)。50例中复合韧带损伤16例37根,其中前交叉+后交叉+外侧副韧带3例9根,前交叉+后交叉+内侧副韧带2例6根,前交叉+内侧副韧带3例6根,后交叉+内侧副韧带3例6根,后交叉+外侧副韧带3例6根,前交叉+外侧副韧带2例4根。单一韧带损伤34例50根,其中前交叉韧带5根,后交叉韧带7根,外侧副韧带7根,内侧副韧带31根。韧带完全横断撕裂7根,其中前交叉韧带1根,后交叉韧带2根,内侧副韧带3根,外侧副韧带1根。87根中部分纵行撕裂80根;7根完全断裂中3根交叉韧带MRI表现为韧带的连续性中断,断端回缩,局部或弥漫性肿胀,PDWI上呈中等信号,T2WI和脂肪抑制序列呈高信号;4根侧副韧带MRI表现为韧带连续性中断或韧带肿胀增粗,PDWI上呈中等信号,T2WI和脂肪抑制序列呈高信号。80根部分纵行撕裂MRI表现为韧带连续性完整,韧带增粗,PD-WI上呈中等信号,T2WI和脂肪抑制序列呈高信号。经手术关节镜检查21例33根,与MRI诊断相符31根,不符合2根,符合率为93.9%。54根经保守治疗后30~40天MRI复查见韧带原异常高信号而恢复至正常低信号,韧带形态类似正常,33根经关节镜下行韧带重建修复术,30~40天MR复查见原异常高信号而恢复至正常低信号,但局部成角或形态仍不规则。结论:MRI对软组织有极高的分辨率,不仅能较清楚显示膝关节韧带损伤,并能显示半月板损伤和骨挫伤,具有较高的实用价值。     

前交叉韧带断裂的MRI征象研究

目的 研究前交叉韧带(ACL)断裂的MRI表现,探讨其直接征象和间接征象的产生机制及诊断价值.方法 本组男37例,女3例;年龄16～49岁,平均33岁.急性期断裂28例,慢性期断裂12例,均经关节镜检查和手术证实.采用1.5 T西门子MRI扫描仪,SE或TSE序列T1、12、质子压脂、medic和横断位、矢状位、冠状位多方位成像.组织3名高年资医师进行回顾分析,对ACL断裂的MRI直接征象和间接征象进行统计分析.结果 ACL断裂4|D例中完全性断裂35例,部分断裂5例.急性期断裂的28例直接征象分别为信号中断或不连续24例(86%),信号不均匀18例(64%),韧带肿胀增厚10例(36%);而慢性期断裂的12例分别韧带增厚11例(92%),信号中断或不连续9例(75%),信号不均匀7例(58%),其中韧带增厚征象主要见于慢性期的ACL断裂(P＜0.01).完全性断裂的35例中,28例(80%)发生在中段,上端、下端发生率低;5例部分断裂均发生在前内侧束.ACL断裂的间接征象中,后交叉韧带(PCL)"7"字变形34例(85%);半月板外露26例,其中外侧半月板外露16例(62%);骨损伤15例,其中胫骨撕裂骨折8例(53%);关节间隙增宽9例,其中78%属于慢性断裂;胫骨前移23例(57%).本组40例中,术前正确诊断37例,正确率为92%;3例部分断裂术前未能诊断,漏诊率为8%.结论 根据ACL断裂的直接征象和间接征象,结合外伤史,术前诊断比较容易.     

兔交叉韧带解剖学及生物力学特性研究

目的:为建立交叉韧带修复与重建动物模型和进行相关研究提供解剖学及生物力学实验依据。方法:6只雄性骨骼成熟新西兰大白兔,后腿自股骨近端截断,配成6对膝关节。取兔正常前、后交叉韧带进行解剖学、几何学和生物力学特性测定。结果:兔交叉韧带在大体解剖学方面与人类基本相同;兔前交叉韧带的材料力学特性与后交叉韧带基本一致,平均长度、横截面积、结构力学特性明显强于后交叉韧带。结论:兔是建立交叉韧带修复与重建动物模型和进行相关实验研究的合适动物,兔前、后交叉韧带在形态结构及材料力学方面的一致性为采用材料力学特性相同的移植物重建交叉韧带提供了实验依据。     

MRI多征象分析对前交叉韧带损伤的诊断价值

目的：评价MRI对前交叉韧带（anterior cruciate ligament,ACL）损伤多种征象的诊断价值。方法：回顾分析了128个膝关节的MR图像。全部膝关节均行关节镜检查,其中52个膝关节的ACL损伤,另外76个膝关节的ACL显示完整。在不告知关节镜结果的前提条件下,2名影像科医生共同对ACL损伤的5个直接征象和10个间接征象进行评价,意见不一致时协商解决差异。结果：在评价的5个直接征象中,ACL不连续和ACL走行异常具有相对高的诊断敏感性和特异性;在评价的10个间接征象中,大多数具有相对高的特异性和低的敏感性,其中空髁间窝征、Notch征、外侧半月板后角裸露征、PCL指数、冠状面PCL单层显示等征象特异性较高。结论：ACL损伤的直接征象为诊断的主要依据,以ACL不连续和ACL走行异常具有较高的诊断价值;ACL损伤的间接征象具有辅助诊断意义,其中空髁间窝征、Notch征、外侧半月板后角裸露征、PCL指数、冠状面PCL单层显示等征象最具有诊断价值。     

Anatomy and biomechanics of theposterior cruciate ligament and posterolateral corner

In this article, the current state of knowledge of the anatomy and biomechanics of the posterior cruciate ligament(PCL) and posterolateral corner (PLC) is discussed, as well as implications for the clinical management of PCL and PLC injuries. The PCL consists of 2 functional components, the anterolateral (AL) and posteromedial (PM) bundles based on their reciprocal tensioning patterns. Based on its larger ultimate load, stiffness, and cross sectional area, the AL bundle has been the focus of single bundle PCL reconstructions to date. The PLC of the knee is comprised primarily of the popliteus complex and lateral collateral ligament (LCL). A significant functional interaction exists between the PCL and PLC, as they work in conjunction to provide both posterior and rotatory knee stability. This article will discuss the interaction between these structures, including the effects of PCL and PLC deficiencies and the effects of factors such as muscle and axial loads on their function. The effects of several surgical variables affecting PCL and PLC reconstruction will also be addressed, including number and placement of tunnels, graft fixation, and associated injuries. Continued understanding of the structure and function of the PCL and PLC will result in the development and improvement of techniques for their reconstruction, as well as more consistent clinical approaches to these complex knee injuries.     

前交叉韧带撕裂的MRI诊断

目的:研究膝关节前交叉韧带撕裂的MRI表现。方法:回顾分析30例经关节镜证实的前交叉韧带撕裂MR图像及40例完好的ACL,分析其直接及间接征象的特征。结果:在评价的直接征象中,ACL不连续和ACL走行异常均具有相对高的诊断敏感性、特异性;在评价的间接征象中,后交叉韧带角、Blumensaat角、后交叉韧带指数、半月板后移征、“对吻性”骨挫伤、胫骨前移位等6个征象具有相对高的特异性,后交叉韧带角、Blumensaat角具有较高的敏感性。结论:ACL损伤的直接征象为诊断主要依据,ACL损伤的间接征象具有辅助诊断意义。     

Low-velocity knee disclocation associated with sports injury

A knee dislocation usually involves injury to both the anterior cruciate ligament and posterior cruciate ligament,and to either the medial collateral ligament or the lateral structures of the knee. Acute surgical repair of all structures has led to a high rate of arthrofibrosis. We describe a treatment algorithm for treatment based on the healing potential of each structure. The medial collateral ligament can heal with a short duration of serial casting. The posterior cruciate ligament can heal without treatment, and patients with laxity of 2+ have similar outcomes to patients with less laxity. The anterior cruciate usually does not heal, but ACL reconstruction can be performed on an elective basis when the acute inflammatory response has subsided.     

A pitfall of transfix fixation during anterior cruciate ligament reconstruction

While attempting femoral fixation during anterior cruciate ligament (ACL) reconstruction using Bio-TransFix (Arthrex, Naples, FL), we experienced failure of complete insertion of a hamstring graft into the femoral tunnel. A passing wire was twisted in the femoral tunnel during insertion of the ACL graft. The cause and methods of prevention of this complication are discussed.     

膝关节弯曲位3T 磁共振成像的临床分析

目的：探讨3 TMR膝关节弯曲位成像的优越性。方法58例临床怀疑膝关节损伤的患者行3 TMRI检查,58例患者同时行常规成像和弯曲位成像。采用双盲法对2种方法得出的常规图像和弯曲位图像按照韧带显示程度和对病变的显示能力进行评价。结果58例膝关节常规成像中,前后交叉韧带同时完整显示19例,显示韧带损伤25例（前交叉韧带损伤9例,后交叉韧带损伤16例）。58例膝关节弯曲位成像中,前后交叉韧带同时完整显示45例,Wrisberg韧带完整显示7例,显示韧带损伤28例（前交叉韧带损伤11例,后交叉韧带损伤16例,Wrisberg 韧带损伤1例）。结论膝关节弯曲位成像的交叉韧带、Wrisberg韧带和病变显示程度明显优于常规方法。