关节镜下修复重建膝关节脱位合并多发韧带损伤的疗效观察

目的 探讨关节镜下重建断裂的前交叉韧带(anterior cruciate ligament,ACL)和后交叉韧带(posteriorcruciate ligament,PCL)及修复膝关节内部结构,治疗膝关节脱位合并多发韧带损伤的临床疗效.方法 2003年7月-2006年8月,收治24例膝关节脱位患者,采用关节镜下重建ACL和PCL,修复内侧副韧带(medial collateral ligament,MCL)、外侧副韧带(lateral collateralligament,LCL)和其他膝关节损伤结构.男19例,女5例;年龄20～69岁,平均42岁.均为单膝损伤,其中左膝11例,右膝13例.于伤后4h～6个月入院.ACL、PCL、MCL及LCL损伤8例,ACL、PCL及MCL损伤12例,ACL、PCL及LCL损伤4例.合并腓总神经损伤1例,内侧半月板损伤3例,外侧半月板损伤7例.评估患者术后并发症、膝关节活动范围和手术前后症状改善情况,Lysholm评分评估手术前后膝关节功能情况.结果 术后患者均获随访11～36个月,平均25个月.4例出现轻微关节僵硬,3例出现轻微关节疼痛,均未作特殊处理.11例(45.8%)运动功能恢复至伤前运动水平;13例(54.2%)显著改善,不需要辅助独立行走.24例Lachman试验、膝内外翻应力试验及前、后抽屉试验均为阴性,胫骨前后移动均<5 mm.1例腓总神经损伤者感觉运动恢复良好.Lysholm膝关节功能评分术前(41.8 ±4.3)分,术后(87.0±6.0)分:关节活动范围术前(87.5±12.5).术后(125.0 ±9.2)°术前、后比较差异均有统计学意义(P<0.05).结论 膝关节脱位后关节镜下重建ACL、PCL和修复其他膝关节结构是治疗膝关节脱位的一种有效方法.     

Comparison of surgical treatments for knee dislocation

This retrospective study compared three surgical procedures for acute knee dislocation. Eleven patients (group 1) underwent direct repair of the cruciate ligaments, 6 patients (group 2) underwent anterior cruciate ligament (ACL) reconstruction with hamstring tendons and posterior cruciate ligament (PCL) reattachment, and 6 patients (group 3) underwent PCL reconstruction with ipsilateral bone-patellar tendon-bone and ACL reconstruction with doubled semitendinosus and gracilis tendons. Average follow-up was 6.9 years (range: 24 months to 19 years). Surgical results were evaluated using the IKDC evaluation form, KT-2000 arthrometer, and Lysholm and Tegner scores. Statistical analysis was performed using Fisher's exact test and the Cochran-Mantel-Haenszel test to compare different surgical procedures. In terms of stability and range of motion, results were less favorable after direct repair and cruciate ligament reattachment. Better results were reported after combined ACL and PCL reconstruction. Average side-to-side total anteroposterior translation as measured by the KT-2000 arthrometer at 20 degrees +/- 5 degrees of knee flexion was 6.67 mm, 3.6 mm, and 3.2 mm in groups 1, 2, and 3, respectively. At final International Knee Documentation Committee (IKDC) evaluation, only 2 group 3 patients achieved a group qualification A, while a group qualification B was achieved by 5 patients (2 patients in group 1, 2 patients in group 2, and 1 patient in group 3). Nine patients in group 1, 4 patients in group 2, and 3 patients in group 3 achieved group qualifications C and D (fair or poor results). Based on these results, we do not recommend reattachment of the cruciate ligaments after knee dislocation for obtaining a stable knee with full range of motion.     

两种方法治疗膝关节脱位韧带损伤

目的：观察关节镜下和切开关节两种方法治疗膝关节脱位韧带损伤的疗效。方法：1994—2003年共治疗13例膝关节脱位，其中7例切开关节修复和重建前、后交叉韧带，同时处理关节内合并伤（A组），6例应用关节镜技术修复和重建前、后交叉韧带，同时处理关节内合并伤（B组），观察两组的治疗效果。结果：按Lysholm膝关节评分标准，A组在术后3、6个月及1年的膝关节平均评分为47、70、76，而B组在术后同期的平均评分为61、86、91。结论：关节镜下治疗膝关节脱位韧带损伤有疗效好、关节功能恢复快的优点。     

Irreducible dislocation of the knee joint: two-stage treatment

Closed reduction attempts may be unsuccessful after traumatic knee dislocations on rare occasions. The interposition of the soft tissues on the medial aspect of the joint into the femoral condyle and tibial plateau is shown to be the cause of an unsuccessful reduction. In such cases, open reduction is the recommended method of treatment. In our study, we presented a 16-year-old male with an open knee dislocation after a motorcycle accident. As our closed reduction attempt failed, open joint reduction and repair of the medial collateral ligament and retinaculum was performed in the first stage of treatment. In the second stage, arthroscopic anterior cruciate ligament and posterior cruciate ligament reconstructions were carried out.     

Complete knee dislocation without posterior cruciate ligament disruption. A report of four cases and review of the literature.

Complete knee dislocation usually causes disruption of both the anterior and posterior cruciate ligaments. Four cases of complete knee dislocation without posterior cruciate ligament (PCL) disruption are reported. All cases involved either anterior or anteromedial dislocation with anterior cruciate ligament disruption and collateral ligament injury, but without posterior cruciate disruption. This is an uncommon finding in complete dislocation of the knee. The PCL may occasionally be spared significant injury in anterior type dislocations, however, thus favorably affecting treatment options.     

Bone resection and ligament treatment for flexion contracture in knee arthroplasty

A retrospective study of 103 knees (88 patients) who had primary total knee arthroplasty with a flexion contracture ranging from 20 degrees to 60 degrees was done to tabulate the primary soft tissue structures released during surgery and to identify any residual deformity. The average flexion contracture preoperatively was 27.1 degrees +/- 8 degrees and postoperatively was 2.7 degrees +/- 3.4 degrees (range, 0 degrees -10 degrees ). The average followup was 70.4 months (range, 12-180 months). Only medial or lateral soft tissue balancing procedures were necessary to correct the flexion contracture in 37 knees (35.9%) and no medial or lateral release was necessary in 25 knees (24.3%), of which 16 had a balanced posterior cruciate ligament. The posterior capsule was released on the deformity side of the knee in 15 knees (14.6%) and on the opposite side of the deformity in seven knees (6.8%). The posterior cruciate ligament was balanced in 21 knees (20.4%) and was released in four knees (3.9%). For all knees in which the posterior cruciate ligament was released or balanced, it was done for excessive rollback and tightness in flexion and not for flexion contracture management. In two patients (2%) an additional 4 mm of distal femur was resected for a 45 degrees and a 25 degrees flexion contracture. The data suggest that a contracted collateral ligament is the most likely primary structure whose effective release allows correction of the flexion contracture in most cases.     

Distribution of posterior tibial displacement in knees with posterior cruciate ligament tears

BACKGROUND: While stress radiography has been used to objectively determine the limits of posterior tibial displacement in knees with posterior cruciate ligament tears, the magnitude and distribution of posterior tibial translation has not been defined in a large population of patients with this injury. METHODS: A retrospective diagnostic study of 1041 consecutive patients with posterior cruciate ligament tears was done. Posterior tibial displacement values that were obtained with use of instrumented stress radiography with the knee held in 90 degrees of flexion in the Telos device were evaluated and compared with the values from relevant cadaveric dissection studies. RESULTS: The mean amount of posterior tibial displacement on stress radiographs was -11.58 +/- 4.31 mm (range, -5 to -30 mm). There was a displacement peak in the range of -9 to -12 mm, with 37.9% of patients exhibiting posterior laxity within this range. Traffic-related injuries were associated with significantly greater displacement values than were sports-related injuries (p < 0.001). Grade-I or II instability (12 mm of posterior tibial displacement) occurred in association with 68.7% of the sports-related injuries, compared with 54.1% of the traffic-related injuries (p < 0.001). The mean amount of posterior tibial displacement on the intact side was -1.31 +/- 1.85 mm (range, -6 to 4 mm). CONCLUSIONS: Instrumented stress radiography is a useful testing method for objectively determining the amount of posterior tibial displacement of the knee in adults with a posterior cruciate ligament injury. Absolute posterior tibial displacement in excess of 8 mm is indicative of complete insufficiency of the posterior cruciate ligament. With tibial displacement exceeding 12 mm, additional injury of secondary restraining structures should be considered. We recommend the use of stress radiography to grade and classify posterior knee laxity.     

Two-stage reconstruction with autografts for knee dislocations

Traumatic knee dislocations are severe injuries that involve damage to the anterior cruciate ligament, the posterior cruciate ligament, and the lateral or medial ligamentous structures. There are no established methods of treatment. The objective of the current study was to report the clinical outcome of a two-stage autologous reconstruction on nine knees (eight patients). The mean followup was 40.1 months. The first stage of the reconstruction was done at a mean of 2 weeks after the injury, and the posterior cruciate ligament was reconstructed by an arthroscopically assisted technique using contralateral autogenous hamstring tendon as the graft material. Three months later, the second stage of the reconstruction was done for the ligaments that had not healed with conservative treatment. Arthroscopically assisted anterior cruciate ligament reconstruction was done on all of the knees using the ipsilateral autogenous hamstring tendon or bone-patellar tendon-bone as the graft material. At the same time, a medial collateral ligament reconstruction using an autogenous semitendinosus tendon was done on one knee, and reconstruction of the posterolateral ligamentous structures using a biceps tendon was done on three knees. Each of the knees that was reconstructed was capable of full extension, and the mean degree of passive flexion was 139.5 degrees +/- 5.2 degrees. The mean side-to-side difference in anteroposterior total laxity (KT-1000 arthrometer, manual maximum) was 2.3 +/- 1.9 mm. None of the knees had lateral or medial instability. All of the injured ligaments were able to be reconstructed with autografts, and severe contracture was able to be prevented. A good clinical outcome can be achieved when two-stage reconstruction is used for traumatic knee dislocations.     

Primary repair of the cruciate and collateral ligaments after traumatic dislocation of the knee

The management of traumatic dislocation of the knee in 40 patients (41 knees) with a mean age of 26.3 years is described. They were treated by primary repair and reconstruction with autologous grafting of the anterior (ACL) and posterior cruciate ligaments (PCL) and repair injuries to the collateral ligament and soft-tissue. The ACL and PCL were reconstructed using the patellar tendon and the gracilis and semitendinosus tendons, respectively. Early mobilisation using a continuous-passive-movement machine and active exercises was started on the second day after operation. At a mean follow-up of 39 months no patient reported 'giving way' and all except one had good range of movement. Of the 41 knees, 21 were rated as excellent, 15 good, four fair and one poor. Early reconstruction of the cruciate ligaments and primary repair of the collateral ligaments followed by an aggressive rehabilitation programme are recommended for these young, active patients.     

In situ forces in the human posterior cruciate ligament in response to muscle loads: a cadaveric study.

The objectives of this study were to determine the effects of hamstrings and quadriceps muscle loads on knee kinematics and in situ forces in the posterior cruciate ligament of the knee and to evaluate how the effects of these muscle loads change with knee flexion. Nine human cadaveric knees were studied with a robotic manipulator/universal force-moment sensor testing system. The knees were subjected to an isolated hamstrings load (40 N to both the biceps and the semimembranosus), a combined hamstrings and quadriceps load (the hamstrings load and a 200-N quadriceps load), and an isolated quadriceps load of 200 N. Each load was applied with the knee at full extension and at 30, 60, 90, and 120 degrees of flexion. Without muscle loads, in situ forces in the posterior cruciate ligament were small, ranging from 6+/-5 N at 30 degrees of flexion to 15+/-3 N at 90 degrees. Under an isolated hamstrings load, the in situ force in the posterior cruciate ligament increased significantly throughout all angles of knee flexion, from 13+/-6 N at full extension to 86+/-19 N at 90 degrees. A posterior tibial translation ranging from 1.3+/-0.6 to 2.5+/-0.5 mm was also observed from full extension to 30 degrees of flexion under the hamstrings load. With a combined hamstrings and quadriceps load, tibial translation was 2.2+/-0.7 mm posteriorly at 120 degrees of flexion ut was as high as 4.6+/-1.7 mm anteriorly at 30 degrees. The in situ force in the posterior cruciate ligament decreased significantly under this loading condition compared with under an isolated hamstrings load, ranging from 6+/-7 to 58+/-13 N from 30 to 120 degrees of flexion. With an isolated quadriceps load of 200 N, the in situ forces in the posterior cruciate ligament ranged from 4+/-3 N at 60 degrees of flexion to 34+/-12 N at 120 degrees. Our findings support the notion that, compared with an isolated hamstrings load, combined hamstrings and quadriceps loads significantly reduce the in situ force in the posterior cruciate ligament. These data are in direct contrast to those for the anterior cruciate ligament. Furthermore, we have demonstrated that the effects of muscle loads depend significantly on the angle of knee flexion.     

Posterior cruciate ligament rupture alters in vitro knee kinematics

Isolated posterior cruciate ligament injuries usually are treated nonoperatively, although some patients remain symptomatic, and degenerative changes within the patellofemoral joint and the medial compartment of the tibiofemoral joint have been seen in followup studies. In vitro simulation of knee squatting was done to quantify the influence of the posterior cruciate ligament on tibiofemoral and patellofemoral kinematics. For five knee specimens, knee kinematics were measured before and after sectioning the posterior cruciate ligament, and compared using a Wilcoxon signed rank test. The only kinematic parameters that changed significantly after sectioning the posterior cruciate ligament were the tibial posterior translation and patellar flexion. The posterior translation of the tibia increased significantly between 25 degrees and 90 degrees flexion. The average increase in the posterior translation exceeded 10 mm at 90 degrees flexion. The patellar flexion increased significantly from 30 degrees to 90 degrees flexion. The average patellar flexion increase peaked at 4.4 degrees at 45 degrees flexion. Increased tibial translation could adversely influence joint stability. Increased patellar flexion could increase the patellofemoral joint pressure, especially at the inferior pole, leading to degenerative changes within the patellofemoral joint.     

Ⅰ期关节镜辅助下修复重建膝关节后外侧脱位合并多发韧带损伤的疗效观察

目的：评估采用Ⅰ期关节镜辅助下重建前后交叉韧带（ACL/PCL）及修复膝后内侧韧带结构的方法,治疗膝关节后外侧脱位的临床效果.方法：自2008年3月至2012年8月,收治膝关节后外侧脱位22例.男16例,女6例;年龄20～53岁,平均30.5岁;运动伤8例,车祸伤5例,摔伤9例.前交叉韧带重建均使用自体半腱肌、股薄肌肌腱;后交叉韧带重建使用LARS人工韧带14例,自体半腱肌、股薄肌肌腱8例;膝后内侧韧带结构损伤行缝合修复17例,行自体半腱肌加强术5例;手术均为Ⅰ期完成.术后早期行CPM及主动活动训练.采用国际膝关节文献委员会IKDC分级及Lysholm评分评估疗效.结果：术后患者均获随访,时间11～56个月,平均39个月.术后膝关节IKDC评定：A级9例,B级10例,C级3例;末次随访IKDC评分89.6±3.1.末次随访Lysholm评分90.7±1.8,术后较术前评分改善.结论：关节镜下Ⅰ期重建前后交叉韧带及修复其他膝后内侧韧带结构,并辅以积极功能锻炼,能较好恢复关节稳定性,临床效果满意,是治疗膝后外侧脱位的一种有效方法.     

Effects of posterior cruciate ligament resection on the tibiofemoral joint gap

The effect of posterior cruciate ligament resection on the tibiofemoral joint gap was analyzed in 30 patients with varus osteoarthritis of thee knee who underwent total knee replacement. The medial soft tissue was released and the bone cut was made without preserving the bone segment of the tibia to which the posterior cruciate ligament was attached. Then the medial and lateral joint gaps in full extension and 90 degrees flexion were measured before and after the posterior cruciate ligament was resected using a tensioning device. After the resection, the flexion gap significantly increased in the medial and the lateral sides (4.8 +/- 0.4 and 4.5 +/- 0.4 mm, respectively, mean +/- standard error) compared with those seen in the extension gap (0.9 +/- 0.2 and 0.8 +/- 0.2 mm). There was no significant difference between the changes in the medial and lateral gaps. The mean value of the flexion gap was 2 mm smaller than the extension gap before the resection and 1.7 mm larger after the sacrifice. Overall, posterior cruciate ligament resection resulted in an increase in the flexion gap and made space for approximately 3-mm thicker polyethylene. The flexion gap can be controlled selectively with posterior cruciate ligament release.     

Total knee arthroplasty with retention of both cruciate ligaments. A nine to eleven-year follow-up study.

BACKGROUND: Although many early designs of total knee arthroplasty allowed the retention of both cruciate ligaments, in most current designs of knee replacement systems, either both cruciate ligaments are removed or the posterior cruciate ligament alone is retained. This report is a review of a series of total knee arthroplasties in which both cruciate ligaments were retained. METHODS: The results of 163 total knee arthroplasties (130 patients) in which both cruciate ligaments were retained were assessed prospectively. One hundred and seven knees (eighty-nine patients) were followed for an average of ten years. There were thirty-four men and ninety-six women, and the average age at the time of the index arthroplasty was sixty-seven years (range, forty-two to eighty-four years). The diagnosis was osteoarthritis in 122 (75 percent) of the knees and rheumatoid arthritis in forty-one (25 percent). Twenty-six knees had a valgus deformity, 109 had a varus deformity, and twenty-eight had a normal alignment of 5 to 10 degrees of valgus. The anterior cruciate ligament was relatively normal in ninety-six knees and was partly degenerated in sixty-seven knees. With use of the rating system of the Knee Society, all 163 knees were prospectively evaluated at yearly intervals; fifty-six of these knees (in forty-one patients) were followed in this manner until the patient died or was lost to follow-up. RESULTS: One hundred and four (97 percent) of the 107 knees available for study at an average of ten years had an excellent or good result. At the time of the latest follow-up, pain was adequately relieved in ninety-seven knees (91 percent) and the average range of flexion was 107+/-12.6 degrees (range, 65 to 135 degrees). Ninety-five knees (89 percent) had normal anteroposterior stability (less than five millimeters of movement in this plane), and twelve knees (11 percent) had five to ten millimeters of movement as demonstrated by the drawer sign. Ninety-six knees (90 percent) had normal mediolateral stability, and eleven (10 percent) had 5 to 10 degrees of laxity. Ninety-four knees (88 percent) had valgus alignment of 5 to 10 degrees. The average knee score was 91+/-8.4 points (range, 54 to 100 points), and the average functional score was 82+/-21 (range, 10 to 100 points). The survival rate at ten years, with revision as the end point, was 95+/-2.0 percent. Seven (4 percent) of the 163 knees in this series were revised. There were no revisions for patellar problems or aseptic loosening of the tibial component. CONCLUSIONS: The good anteroposterior stability in this series after an average follow-up period of ten years indicates that both the anterior and the posterior cruciate ligaments, even when partly degenerated, remain functional when they are preserved in a total knee arthroplasty.     

生物可吸收挤压螺钉在膝关节韧带重建术中的应用

目的探讨生物可吸收挤压螺钉在膝关节韧带重建术中的应用和疗效。方法2002年4月~2004年8月,收治膝关节韧带损伤患者39例,其中男33例,女6例;年龄15~65岁,中位年龄25岁。单纯前交叉韧带(anterior cruciate ligament,ACL)损伤29膝,单纯后交叉韧带(posterior cruciate ligament,PCL)损伤6膝,ACL和PCL联合损伤4膝。合并内侧或外侧侧副韧带损伤3膝,合并后外侧结构损伤1膝。病程1周~8年。所有患者均行关节镜下或结合开放韧带重建术,采用自体移植物及生物可吸收螺钉固定。采用Lysholm临床评分系统对膝关节功能进行评估。结果术后34例获随访6~28个月,平均13.7个月。术后膝关节功能评分由术前43.6±13.4分,增加至术后85.4±16.3分,且差异有统计学意义(P<0.05)。患者疼痛均消失,关节稳定,无交锁和无力等症状,均恢复关节活动度,螺钉无松动。术后1例出现感染征象,3例发生局部积液和滑膜炎,经保守治疗后好转。结论在膝关节韧带重建术中,生物可吸收挤压螺钉固定疗效可靠,能有效重建韧带,恢复膝关节稳定性。     

High-energy knee dislocation without anterior cruciate ligament disruption in a skeletally immature adolescent

Knee dislocations are rare injuries in any age group, but even more unusual in skeletally immature individuals. Such injuries often occur from high-energy mechanisms and are commonly associated with disruption of both anterior and posterior cruciate ligaments. Although there are several previous reports of knee dislocation without disruption of the posterior cruciate ligament, there is only one report citing 3 cases of knee dislocation with the anterior cruciate ligament remaining intact, each occurring in skeletally mature individuals. We present a high-energy knee dislocation in a skeletally immature girl without anterior cruciate ligament disruption. We also discuss the evaluation, management, and outcome. Treatment of this condition with arthroscopically assisted posterior cruciate ligament reconstruction using tibialis anterior allograft 2 weeks after the acute injury resulted in complete functional recovery.     

Delayed proximal repair and distal realignment after patellar dislocation

Twenty athletes with distal malalignment who sustained unilateral traumatic patellar dislocation remained impaired by chronic instability. Surgery was performed at a mean age of 18 years. Posttraumatic attenuation of the medial patellofemoral ligament was repaired near the margin of the patella in 10 knees and avulsion or attenuation posterior to the vastus medialis obliquus in 10 knees. Advancement of the medial patellomeniscal ligament at the margin of the patella and normalization of the Q angle to 10 degrees by tibial tubercle osteotomy were performed in each knee. Distal lateral retinacular release without release of the normal vastus lateralis tendon was performed. Results were judged according to Turba et al, and activity levels were evaluated per guidelines of the International Knee Documentation Committee. Eighteen (90%) patients achieved good or excellent results and were unimpaired at a minimum of 24 months. Two patients achieved fair subjective results with some impairment in vigorous activity. There was no recurrent instability. Radiographically, the mean preoperative patellofemoral congruence angle improved from 20 degrees to 0 degree. Athletes who sustain an initial traumatic patellar dislocation after physeal closure and in whom conservative management fails can be treated successfully by repair of the medial patellofemoral ligament at the site of disruption and advancement of the medial patellomeniscal ligament combined with correction of an elevated Q angle.     

Reconstruction of knees with combined cruciate deficiencies: a biomechanical study

BACKGROUND: Clinical results of dual cruciate-ligament reconstructions are often poor, with a failure to restore normal anterior-posterior laxity. This could be the result of improper graft tensioning at the time of surgery and stretch-out of one or both grafts from excessive tissue forces. The purpose of this study was to measure anterior-posterior laxities and graft forces in knees before and after reconstructions of both cruciate ligaments performed with a specific graft-tensioning protocol. METHODS: Eleven fresh-frozen cadaveric knee specimens underwent anterior-posterior laxity testing and installation of load cells to record forces in the native cruciate ligaments as the knees were passively extended from 120 degrees to -5 degrees with no applied tibial force, with 100 N of applied anterior and posterior tibial force, and with 5 N-m of applied internal and external tibial torque. Both cruciate ligaments were reconstructed with a bone-patellar tendon-bone allograft. Only isolated cruciate deficiencies were studied. We determined the nominal levels of anterior and posterior cruciate graft tension that restored anterior-posterior laxities to within 2 mm of those of the intact knee and restored anterior cruciate graft forces to within 20 N of those of the native anterior cruciate ligament during passive knee extension. Both grafts were tensioned at 30 degrees of knee flexion, with the posterior cruciate ligament tensioned first. Measurements of anterior-posterior knee laxity and graft forces were repeated with both grafts at their nominal tension levels and with one graft fixed at its nominal tension level and the opposing graft tensioned to 40 N above its nominal level. RESULTS: The anterior and posterior cruciate graft tensions were found to be interrelated; applying tension to one graft changed the tension of the other (fixed) graft and displaced the tibia relative to the femur. The posterior cruciate graft had to be tensioned first to consistently achieve the nominal combination of mean graft forces at 30 degrees of flexion. At these levels, mean forces in the anterior cruciate graft were restored to those of the intact anterior cruciate ligament under nearly all test conditions. However, the mean posterior cruciate graft forces were significantly higher than the intact posterior cruciate ligament forces at full extension under all test conditions. Anterior-posterior laxity was restored between 0 degrees and 90 degrees of flexion with both grafts at their nominal force levels. Overtensioning of the anterior cruciate graft by 40 N significantly increased its mean force levels during passive knee extension between 110 degrees and -5 degrees of flexion, but it did not significantly change anterior-posterior laxity between 0 degrees and 90 degrees of flexion. In contrast, overtensioning of the posterior cruciate graft by 40 N significantly increased posterior cruciate graft forces during passive knee extension at flexion angles of <5 degrees and >95 degrees and significantly decreased anterior-posterior laxities at all flexion angles except full extension. CONCLUSIONS: It was not possible to find levels of graft tension that restored anterior-posterior laxities at all flexion positions and restored forces in both grafts to those of their native cruciate counterparts during passive motion. Our graft-tensioning protocol represented a compromise between these competing objectives. This protocol aimed to restore anterior-posterior laxities and anterior cruciate graft forces to normal levels. The major shortcoming of this tensioning protocol was the dramatically higher posterior cruciate graft forces produced near full extension under all test conditions.     

Neglected posterior dislocation of the elbow. A reconstruction operation

A new technique for repair of neglected posterior dislocation of the elbow is described, consisting of open reduction with tendon graft stabilisation to create a medial collateral and an intra-articular "cruciate" ligament. This allows flexion-extension exercises to start six days after operation. Eleven cases are reported in which the average range of movement improved from 38 degrees before operation to 105 degrees after a minimum follow-up of two years, with a mean valgus-varus instability of only 13 degrees. One patient had a postoperative infection but all the others were satisfied with the functional result.     

膝关节脱位的治疗策略及疗效分析

 目的 探讨膝关节脱位的治疗策略及临床疗效。方法 对单侧膝关节脱位36 例进行回顾性分析, 男22 例, 女14 例, 年龄19~72 岁, 平均35 岁。按改良Schenck 膝关节脱位分型, 急性膝关节脱位30 例, 其中KD- I型7 例(X 线表现为旋转型膝关节脱位)、KD-III型23 例;陈旧性膝关节脱位6例, 均为KD-III型。KD- I型急性膝关节脱位7 例、KD-III型陈旧性膝关节脱位6 例均行一期关节镜下十字韧带重建术+侧副韧带重建或修复术。KD-III型急性膝关节脱位23 例中2 例高龄患者采用手法复位及石膏固定;18 例采用分期手术, 先修复或重建侧副韧带, 3 周后再重建十字韧带;3 例合并血管、神经损伤者行一期十字韧带重建术+侧副韧带重建或修复术。末次随访时行膝关节临床检查和功能评估。结果 全部病例随访18~36个月, 平均27 个月。末次随访时Lysholm 膝关节评分(82.0±11.4)分, Tegner 膝关节运动水平评分(5.5±1.3)分, 关节活动度118.3°±19.2°, 与术前比较均有改善(P <0.01)。8 例(23.5%, 8/34)残留膝关节不稳定: Sag 征阳性和后抽屉试验(++)~(+++)8 例, 外翻应力试验(++)1 例, 内翻应力 试验(+++)1 例。结论 对KD- I型急性膝关节脱位和KD-III型陈旧性膝关节脱位可采用关节镜下一期手术;对KD-III型急性膝关节脱位可采用分期手术, 以降低术后关节僵硬的风险。