内侧半月板Ramp损伤的研究进展

前交叉韧带损伤常合并内侧半月板Ramp损伤,陈旧性前交叉韧带损伤更易合并内侧半月板Ramp损伤。MRI与膝关节镜检查是确诊内侧半月板Ramp损伤的主要方法。内侧半月板Ramp损伤以手术治疗为主,包括关节镜下内侧半月板后角部分切除、单纯撕裂部位的创面新鲜化技术或全内缝合术式。Ramp损伤,近期疗效显著,远期疗效有待进一步观察。本文对国内外近年有关内侧半月板Ramp损伤的相关文献进行综述。     

半月板Ramp损伤手术治疗研究进展

<正>半月板撕裂的处理原则和手术方式主要取决于撕裂的部位和严重程度。1983年,Hamberg等^[1]首次报道缝合修复对内侧半月板后角撕裂的重要意义。1988年,Strobel^[2]将这种位于内侧半月板后角、累及后角本身及其与关节囊的移行结构的半月板撕裂称为半月板Ramp损伤(meniscus ramp lesion,MRL)。随着学界对内侧半月板后角(posterior horn of the medial meniscus,PHMM)的解剖学结构的认识逐渐加深以及影像学技术的不断发展,越来越多的Ramp损伤在临床中诊断,尤其是在前交叉韧带(anterior cruciate ligament,ACL)损伤时,并发Ramp损伤的占比为9.3%～42%^[3～6]。近年来,不伴有明显ACL损伤的孤立性Ramp损伤也逐渐报道^[7]。     

前十字韧带损伤合并内侧半月板ramp损伤

目的探讨前十字韧带损伤合并内侧半月板ramp损伤的发生率、诊断方法、修补术及其临床疗效。方法2002年4月至2005年4月,共进行333例单纯前十字韧带损伤重建术,陈旧性损伤(>3个月)215例,急性损伤(<3个月)118例。合并内侧半月板ramp损伤者89例,其中85例需手术修补。手术取腘绳肌腱、自体或异体骨-髌腱-骨移植物重建前十字韧带,同时应用全内缝合方法,经两个后内入路配合经髁间窝入路,利用缝合钩修补ramp损伤。前十字韧带损伤中,ramp损伤的总发生率为26.7%,其中陈旧性损伤的发生率为30.7%,急性损伤为19.5%。结果可随访者75例(88.2%),随访5～41个月,平均20.2个月。随访时采用主观症状观察、临床查体、二次关节镜手术观察及MR检查。其中二次手术观察25例,MR复查21例。在可随访的75例患者中,所有患者的主观症状及临床查体均呈正常表现;在二次关节镜手术观察的25例中,均全部愈合。在经MR复查的21例中,18例完全愈合,3例部分愈合。结论大约1/3的前十字韧带损伤合并有内侧半月板ramp损伤,陈旧性损伤较新鲜损伤合并ramp损伤的发生率更高。在重建前十字韧带的同时应修补ramp损伤,全内缝合方法是修补ramp损伤的很好方法,可以达到很高的愈合率。     

膝关节前十字韧带合并半月板损伤不同治疗方法的远期观察

本文为135例前十字韧带修补或重建术后6～16年病人的作回顾性分析。将病人分为两组进行比较。Ⅰ组:急性完全性前十字韧带断裂55例,大多数合并侧副韧带断裂,平均年龄28±10(12～59)岁。除3例外,均作前十字韧带缝合修复。19例内侧、4例外侧半月板行手术切除,1例内侧半月板撕裂修补,1例外侧半月板破裂未处理。Ⅱ组:慢性前十字韧带损伤80例,平均年龄27±9岁。其中大多数于伤后2年行外侧关节外肌腱固定术。本组再根据合并损伤分为4小组,每组20例。Ⅱ组A:半月板未受损。Ⅱ组B:已行半月板修补一年后,关节镜检查证实修复成功,同膝另一侧半月板未受损。Ⅱ组C:18例内侧和2例外侧半月板于     

内侧半月板修复后十字韧带损伤五例

后十字韧带由于解剖的位置关系,损伤后修复困难,我们采用内侧半月板作为材料修复5例,获得良好效果,报告如下。 1 临床资料 1.1 一般资料 本组5例中男性4例,女性1例,年龄在25～44岁。由于外伤所致,均伴有内侧副韧带及内侧半月板损伤。 1.2 方法 作膝关节内侧切口,切断内侧半月板前角及边缘,留至半月板后角止点,在内髁窝处钻孔,用直径1.2mm钢丝成“8”字型穿过半月板前角,再通过骨孔固定在内髁的皮肤表面。用半腱肌修补内侧副韧带,石膏托外固定,6周后解除石膏,拔出钢丝。     

膝关节前十字韧带切断对内侧半月板后角应力的影响

目的确定前十字韧带损伤与内侧半月板后角的生物力学量化关系。方法对10具尸体膝关节标本应用生物力学加载装置进行测试,实验分前十字韧带完整组和前十字韧带切断组。对膝关节同时加载134N前向载荷与200N轴向载荷,膝关节屈曲30°、60°、90°时,通过压力感受器测定内侧半月板后角所承受的压力载荷。结果前十字韧带完整组内侧半月板后角所承受的应力分别为:屈膝30°时(22.8±11.5)N,屈膝60°时(27.1±16.3)N,屈膝90°时(26.7±14.5)N;前十字韧带切断组分别为:屈膝30°时(87.3±43.9)N,屈膝60°时(77.7±43.3)N,屈膝90°时(66.2±40.1)N,应力值较前十字韧带完整组明显增加,差异均有统计学意义(P<0.05)。前十字韧带切断组与完整组内侧半月板后角所受应力的比值分别为:屈膝30°时5.7±5.4,屈膝60°时3.5±3.1,屈膝90°时2.6±1.3。表明ACL切断后,内侧半月板后角所受应力数值平均增加了160%￣470%。结论前十字韧带对内侧半月板后角所受应力具有显著影响,前十字韧带缺损后内侧半月板后角承受过度负荷,处于损伤的高危状态。对前十字韧带损伤后的内侧半月板后角继发损伤必须准确诊断并制订合理的治疗方案。     

膝关节外侧半月板假撕裂MRI征象分析及临床意义

目的:明确板股韧带及膝横韧带所致外侧半月板假撕裂的发生机制,探讨外侧半月板假撕裂与真撕裂的鉴别方法。方法:对自2012年6月至2014年2月间72例(左膝44例,右膝28例)经关节镜证实的无外侧半月板撕裂的膝关节进行矢状及冠状位MR扫描,其中男41例,女31例;年龄25～61岁,平均33.7岁。观察板股韧带及膝横韧带的MRI表现。结果:膝横韧带与外侧半月板前角及其中央腱性附着部之间以脂肪组织分隔,在MRI矢状像上,可见脂肪组织在膝横韧带与外侧半月板前角之间形成的线样稍高信号裂隙,类似外侧半月板前角撕裂,称为外侧半月板前角假撕裂。板股韧带在矢状像上表现为位于后交叉韧带前或后方的类圆形或短棒状低信号结构,而在冠状像上表现为自外侧半月板后角至股骨内侧髁外侧面的条带样低信号结构。在矢状像上,板股韧带与外侧半月板后角之间显示出一线样高信号,称为外侧半月板后角假撕裂。膝横韧带在MRI上的出现率约34.7%(25/72),表现为外侧半月板前角假撕裂18例,均表现为外侧半月板形态规则、撕裂线斜行,矢状位图像可连续显示膝横韧带,冠状位图像能显示该韧带的长轴。板股韧带显示率为73.6%(53/72),其中板股前韧带为23.6%(17/72),板股后韧带为70.8%(51/72),两条韧带同时存在为16.7%(12/72).表现为外侧半月板后角假撕裂25例,假撕裂仅有两种走行方向,即后下斜行(19/25)或垂直方向(6/25).结论:根据外侧半月板形状、撕裂线方向、观察矢状和冠状位图像,可正确区分外侧半月板的真、假撕裂。     

应用Fast-fix 360全内缝合技术修复半月板Ramp区损伤的临床研究

目的探讨应用Fast-fix 360全关节内缝合技术修补半月板Ramp区损伤的方法和疗效。方法2016年10月至2018年4月,中部战区总医院骨科足踝与运动医学中心使用Fast-fix 360缝合技术修补经镜下确诊为内侧半月板Ramp区损伤病人15例,其中男14例,女1例,平均年龄为23.6岁,病人均合并前交叉韧带(anterior cruciate ligament,ACL)断裂,均予以一期行ACL自体腘绳肌单束重建,6例合并外侧半月板损伤亦同期处理。术后行膝关节标准化功能康复。收集病例手术时间、术中出血量、术后并发症情况;术前、术后半年、术后1年的Lysholm膝关节评分、国际膝关节评分委员会(International Knee Documentation Committee,IKDC)评分;术后半年、1年分别复查患膝关节MRI,评估Ramp区损伤修复情况。结果病人随访13~26个月(平均17.8个月)。手术时间为(90.8±21.4)min,术中出血量为(50.5±10.6)ml。术后2例病人移植肌腱供区伤口浅表感染,经延长换药后均愈合;无伤口深部感染及膝关节感染;未出现腘窝血管神经损伤情况。术后半年及1年的Lysholm膝关节评分、IKDC评分均显著高于术前,差异均有统计学意义(P均<0.05)。术后半年MRI评估Ramp区的愈合率为73.3%,术后1年其愈合率提高至86.7%。结论使用Fast-fix 360全关节内缝合技术修补半月板Ramp区损伤,同时一期重建ACL,可获得较满意的临床疗效,方法简单、手术时间短,可作为半月板Ramp区损伤的一种常规修复方法。     

关节镜微创手术治疗膝关节半月板损伤

目的探讨关节镜微创手术治疗膝关节半月板损伤的方法及疗效。方法回顾性分析应用膝关节镜诊治膝关节半月板损伤患者63例,施行半月板部分切除成形术16例,部分切除及囊肿切除3例,盘状半月板部分切除成形术4例,半月板全切除5例,半月板破裂缝合35例（包括合并有前十字韧带损伤3例,前十字韧带和内侧副韧带同时损伤1例,后十字韧带损伤1例）。采用Lysholm评分评定膝关节功能,术前Lysholm评分平均为（48.6±6.2）分。结果全部获得随访,随访时间为1～23个月,平均10个月。术后Lysholm评分平均为（90.5±5.8）分,较术前有显著提高,差异有统计学意义（t=4.12,P〈0.01）。结论关节镜微创手术治疗半月板损伤,综合应用缝合技术可达到最大限度保留半月板,创伤小、恢复快、疗效佳,并可同时处理其他病变。     

膝关节骨关节炎内侧半月板突出的临床意义

目的 探讨膝关节骨关节炎患者内侧半月板突出的病因及影响.方法 选取2011年1月至2012年3月诊断为膝关节退行性骨关节炎并经MRI确认有内侧半月板突出的60例患者为半月板突出组,无突出的60例为对照组.在MRI上测量内侧半月板突出距离、胫股角,分析突出组胫股角与突出距离的相关性,比较两组膝内翻、内侧半月板及胫股关节软骨损伤的发生率,分析内侧半月板突出对半月板损伤、膝内翻对半月板突出的影响.结果 突出组:半月板突出距离平均(8.30±1.79) mm;60例有膝内翻,胫股角平均179.0°±2.2°;内侧半月板损伤发生率:前角50.0％ (30/60),体部93.3％ (56/60),后角93.3％ (56/60);内侧半月板后角根部撕裂14例,发生率23.3％(14/60);胫股内侧关节软骨退变发生率:胫骨内侧平台100％(60/60),股骨内髁100％(60/60);胫股角与内侧半月板突出距离呈负相关.对照组:内侧半月板超出胫骨内侧平台边缘的距离平均(0.57±0.80) mm;4例膝内翻;内侧半月板损伤发生率:前角0,体部16.7％(10/60),后角70.0％ (42/60);无内侧半月板后角根部撕裂;胫股内侧关节软骨退变发生率:胫骨内侧平台26.7％(16/60),股骨内髁30.0％ (18/60).半月板突出组与对照组半月板损伤比值比为6.0、膝内翻例数比值比为15.0.半月板突出组内侧半月板各部位及胫股内侧关节软骨损伤的发生率和严重程度高于对照组.结论 膝内翻可能是内侧半月板突出的原因之一,内侧半月板突出显著增加半月板损伤的发生率,其对膝胫股内侧关节骨关节炎的发生、发展有重要影响.     

Arthroscopic studies of variants of the anterior horn of the medial meniscus

The objective of this study was to arthroscopically analyse the morphology and dynamics of variants of the anterior horn of the medial meniscus of the knee (VAMM) and to then consider the pathological significance of these variants. VAMM was defined as knees in which the anterior horn of the medial meniscus is not attached to the tibia. Between April 1992 and March 1995, arthroscopy was performed on 953 knees of 903 patients. At the time of this examination, observation and probing were performed to determine the condition of the synovium, the synovial plica, the cartilage in all compartments, the meniscus, the cruciate ligaments, and the popliteal tendon. In particular, detailed examination was made of the anterior horn of the medial meniscus with regard to the point of insertion to the tibia and the degree of movement in knee flexion/ extension. Cases of VAMM diagnosed on the basis of the arthroscopic findings were classified into the following four categories: the ACL (anterior cruciate ligament) type, where the anterior horn of the medial meniscus was attached to the ACL; the transverse ligament type, where the anterior horn of the medial meniscus was attached to the transverse ligament; the coronary ligament type, where the anterior horn of the medial meniscus was attached to the coronary ligament; and the infrapatellar fold type, where the anterior horn of the medial meniscus was attached to the infrapatellar synovial fold. These patients were then analyzed with regard to the arthroscopic findings and the intra-articular lesions other than VAMM. In 98 (10.9%) of the total patients, 103 knees were classified as VAMM. Classification of those 103 knees using the above criteria showed 39 ACL type knees, 51 transverse ligament type knees, 11 coronary ligament type knees, and 2 infrapatellar fold type knees. The arthroscopic findings indicated that the anterior horn of the medial meniscus was not attached directly to the tibia in any of these knees. Probing and flexion/extension of the knee revealed hypermobility at the anterior horn of the medial meniscus. In this study, anterior knee pain syndrome was diagnosed in 12 (11.7%) of the 103 VAMM knees. In addition, there was no clear history of trauma in 20 of 23 knees found to have an isolated medial meniscus tear. In these cases, even detailed arthroscopic observation proved the causes of the symptoms or injury. On the basis of these findings, we surmised that the anterior portion shows hypermobility at the time of flexion/extension of the knee, regardless of the type of VAMM. In this study, we discussed the possibility that the existence of VAMM may become the cause of pain or injury to the meniscus.     

Posterior root tear fixation of the lateral meniscus combined with arthroscopic ACL double-bundle reconstruction: technical note of a transosseous fixation using the tibial PL tunnel

According to our observation in ACL reconstruction, we find root tears of the posterior horn of the lateral meniscus as a common concomitant injury in ACL-deficient knees. This might be a consequence of initial trauma or of the increased anterior–posterior translation of the tibia and an overload impact on the posterior meniscus root in ACL-deficient knees. A tear of the posterior horn of the medial meniscus causes a 25% increase in peak pressure in the medial compartment compared with that found in the intact condition. The repair restores the peak contact pressure to normal (Allaire et al. in J Bone Joint Surg Am 90(9):1922–1931, [2008]). A tear of the posterior horn of the lateral meniscus might have similar consequences. We hypothesize the surgical anatomical reattachment of the root at the tibia helping to restore knee joint kinematics and helping to advance ACL-graft function. This article presents an arthroscopical technique to reattach the posterior meniscus root in combination with ACL double-bundle reconstruction. The procedure uses the tibial PL tunnel to fix the meniscus suture.     

Meniscal lesions in so-called "isolated" ruptures of the anterior cruciate ligament. Apropos of 59 cases

Between December 1984 and March 1987, i.e. a period of 27 months, the authors operated on 59 "isolated" fresh ruptures of the ACL with routine evaluation of the posterior horns of the medial and lateral menisci. Lesions were investigated either by arthroscopy (23 cases) or by anterior arthrotomy with routine medial and lateral retro-ligamentous counter-incision (36 cases). This revealed 21 lesions of the medial meniscus (i.e. 35.5%) and 38 lesions of the lateral meniscus (i.e. 64.5%). Lesions of both menisci were present in 16 knees (27%) and only 16 knees (27%) were found to be free of any meniscal lesion. The majority of meniscal lesions were viable and could be sutured in 86% of cases for the medial meniscus and 87% of cases for the lateral meniscus. From the standpoint of operative technique, posterior lesions are relatively poorly visualized by arthroscopy (notably concerning the posterior horn of the medial meniscus though it is easier to assess the stability of the meniscus by this technique using the palpating hook. Lesions are well visualized by medial and lateral retroligamentous counter-incisions, but it is difficult to assess meniscus stability. Finally it should be noted that all of these ruptures of the ACL were dealt with by reconstruction of the central pivot either by suture and a strengthening procedure (semitendinous) or by ligament plasty from the outset.     

Dislocating anterior horn of the medial meniscus

Dislocating anterior horn of the medial meniscus was found in 15 knees of 13 patients during arthroscopic examinations done between 1992 and 1995. All of them were available for follow-up evaluation (4 by telephone). There were 11 men and 2 women (average age, 28 years; range, 17 to 49 years). Nine knees had a history of trauma. Only 1 knee had had trauma in two bilateral cases. Duration of symptoms was an average of 3.3 years (range, 3 months to 10 years). The knees were stable clinically. Arthroscopy revealed associated lesions in 13 knees; hypertrophic medial plicae, meniscal, chondral and anterior cruciate ligament (ACL) lesions predominated. Three knees had unusually hypertrophic ligamentum mucosum. Eleven of 13 knees had more than one associated lesions. Only 2 knees (2 patients) had isolated dislocating anterior horn of the medial meniscus. Only the associated lesions were treated (except for ACL lesions) and dislocating anterior horns of the medial menisci were left alone. Follow-up averaged 21 months (7 to 40 months). At follow-up, 11 knees were graded as excellent, 3 as good, and 1 as fair according to the Lysholm scale. Eight knees had minor symptoms and 6 were asymptomatic; no improvement was noted in 1 knee. Overall, 12 patients (14 knees) were satisfied with their treatment. Dislocating anterior horn of the medial meniscus is a normal anatomic variant with little or no clinical significance. When seen during arthroscopy, a significant lesion should be looked for. It is an incidental finding and should be left alone.Arthroscopy 1998 Apr;14(3):246-9     

Precision in the diagnosis of meniscal lesions: a comparison of clinical evaluation, arthrography, and arthroscopy

We assessed the accuracy of clinical evaluation, arthrography, and arthroscopy in the diagnosis of meniscal lesions in fifty knees in which arthrotomy was performed for disabling symptoms after evaluation by these three methods. At surgery, forty-seven menisci were removed, of which forty-four were abnormal and three were normal. In three patients with normal menisci, loose bodies were found in two and the exploration was negative in one. In the forty-four knees with a meniscal lesion, a correct diagnosis was made clinically forty time, arthrographically thirty-nine times, and arthroscopically thirty-two times. Most errors occurred in the knees with posterior horn lesions of the medial meniscus. Clinical diagnosis was least accurate for lesions of the lateral meniscus (four missed) and arthroscopy was least accurate for lesions of the posterior horn of the medial meniscus (ten missed). Arthrography appeared to provide collateral evidence of lesions not seen directly. Based on this study it was concluded that even with negative findings by arthroscopy and arthrography it still may be necessary occasionally to remove a meniscus on the basis of the clinical evaluation.     

Combined Injury to the ACL and Lateral Meniscus Alters the Geometry of Articular Cartilage and Meniscus Soon After Initial Trauma

Combined injury to the anterior cruciate ligament (ACL) and meniscus is associated with earlier onset and increased rates of post-traumatic osteoarthritis compared with isolated ACL injury. However, little is known about the initial changes in joint structure associated with these different types of trauma. We hypothesized that trauma to the ACL and lateral meniscus has an immediate effect on morphometry of the articular cartilage and meniscus about the entire tibial plateau that is more pronounced than an ACL tear without meniscus injury. Subjects underwent magnetic resonance imaging scanning soon after injury and prior to surgery. Those that suffered injury to the ACL and lateral meniscus underwent changes in the lateral compartment (increases in the posterior–inferior directed slopes of the articular cartilage surface, and the wedge angle of the posterior horn of the meniscus) and medial compartment (the cartilage-to-bone height decreased in the region located under the posterior horn of the meniscus, and the thickness of cartilage increased and decreased in the mid and posterior regions of the plateau, respectively). Subjects that suffered an isolated ACL tear did not undergo the same magnitude of change to these articular structures. A majority of the changes in morphometry occurred in the lateral compartment of the knee; however, change in the medial compartment of the knee with a normal appearing meniscus also occurred. Statement of clinical significance: Knee injuries that involve combined trauma to the ACL and meniscus directly affect both compartments of the knee, even if the meniscus and articular cartilage appears normal upon arthroscopic examination. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 38:759-767, 2020     

Impact of Partial and complete rupture of anterior cruciate ligament on medial meniscus: A cadavaric study

Background:

The clinical relationship between medial meniscus tear and anterior cruciate ligament (ACL) rupture has been well documented. However, the mechanism of this clinical phenomenon is not exactly explained. Our aim is to investigate the biomechanical impact of partial and complete ACL rupture on different parts of medial meniscus.

Materials and Methods:

Twelve fresh human cadaveric knee specimens were divided into four groups: ACL intact (ACL-I), anteromedial bundle transection (AMB-T), posterolateral bundle transection (PLB-T), and ACL complete transection (ACL-T) group. Strain on the anterior horn, body part, and posterior horn of medial meniscus were measured under 200 N axial compressive tibial load at 0°, 30°, 60°, and 90° of knee flexion, respectively.

Results:

Compared with the control group (ACL-I), the ACL-T group had a higher strain on whole medial meniscus at 0°, 60°, and 90° of flexion. But at 30°, it had a higher strain on posterior horn of meniscus only. As to PLB-T group, strain on whole meniscus increased at full extension, while strain increased on posterior horn at 30° and on body of meniscus at 60°. However, AMB-T only brought about higher strain at 60° of flexion on body and posterior horn of meniscus.

Conclusions:

Similar to complete rupture, partial rupture of ACL can also trigger strain concentration on medial meniscus, especially posterior horn, which may be a more critical reason for meniscus injury associated with chronic ACL deficiency.