后方稳定型全膝人工关节置换术30例分析

[目的]探讨后方稳定型全膝人工关节置换术(posterior stabilized knee arthroplasty,PSKA)治疗膝关节疾患的优点及术中、术后应注意的一些问题.[方法]2001年10月～2006年1月,共计PSKA 30例,男3例(5膝),女27例(32膝),其中双膝7例.年龄54～78岁.术前诊断全部为膝关节骨性关节炎,伴有骨质缺损4膝.术前X线膝关节测量膝内翻畸形28例,膝外翻2例,屈曲畸形28膝,有膝关节手术史4膝.30例随访12～60个月,平均21个月.根据美国特种外科医院(the hospital for special surgery,HSS)膝关节百分评分系统进行评估[1].[结果]术前平均62分,术后平均89分,活动范围术前平均89°,术后平均115°,其中优30膝,良5膝,中1膝,差1膝.手术优良率94.8%.[结论]PSKA可增加膝关节活动度和最大屈曲度,并限制其向后半脱位.它不但用于原发的膝关节疾病,还应用于膝关节手术后的患者.髌骨并发症在PSKA最常见,对于骨质疏松者,术中髌骨强力翻转易导致髌腱止点撕脱、上移,术后伸膝无力应予重视.强调术后的功能锻炼对膝关节功能恢复的重要性.     

严重膝关节伸直挛缩的微创治疗

目的介绍一种治疗严重膝关节伸直挛缩的微创手术方法,探讨其临床疗效。方法1998年9月至2001年10月,共手术治疗22例膝关节伸直挛缩患者,手术包括小切口股四头肌成形术和关节镜清理术两部分。首先通过髌骨外上方的小切口行股四头肌成形术,逐步解除阻碍膝关节屈曲的关节内和关节外因素。在此基础上,再行关节镜下清理术。术后第1d即开始行功能锻炼。结果术后随访14￣63个月,平均42个月。22例患者中16例重度伸直挛缩患者行股四头肌肌腱延长术。膝关节屈曲由术前的平均27°(5°￣45°)增加到术后即刻的141°(120°￣150°);伸膝缺失由术前的平均0.9°(0°￣10°)减少到术后即刻的0.45°(0°￣5°)。随访结束时本组平均屈曲度为115°(75°￣150°),增加88°(45°￣125°),与术前相比差异有统计学意义(t=-19.317,P<0.01),平均伸膝缺失为1.1°(0°￣15°),增加0.2°。按照Judet标准,优16例,良5例,可1例。手术前后平均HSS膝关节功能评分分别为74分和94分。有1例患者切口发生浅表感染,另1例存在15°永久性伸膝缺失。结论该方法适用于大多数膝关节伸直型挛缩畸形,具有创伤小、并发症少、操作简单和疗效可靠等优点。它提供了一种全新的、能够替代传统方法的治疗手段。     

膝关节内翻屈曲畸形全膝关节置换的早期疗效

目的 探讨膝关节内翻屈曲挛缩畸形施行全膝关节置换(TKA)后的早期疗效.方法 回顾性分析自2007年7月～2009年5月,对膝关节内翻屈曲畸形49例(57膝)施行TKA的资料.行单膝TKA术41例,行双膝TKA 8例.术前平均膝关节内翻角、屈曲挛缩度数、膝关节HSS评分分别为(13.1±1.5)°、(18.55±0.6)°、(37.9±3.4)分.结果 患者获随访5～30个月,平均18个月.术后平均膝关节股胫角、屈曲挛缩度数分别为(174.2±1.9)°、(0.3±0.15)°.膝关节HSS评分术后为(88.3±5.1)分,与术前比较差异具有统计学意义(P＜0.05).无切口、深部感染及再翻修者.结论 人工全膝关节置换治疗膝关节屈曲挛缩畸形临床疗效较好.术中准确切骨、软组织平衡是矫正膝关节内翻屈曲挛缩畸形的关键.     

胫骨内侧高位楔形截骨治疗膝关节骨性关节炎

目的　探讨胫骨内侧高位楔形截骨治疗伴有膝内翻畸形的膝关节骨性关节炎的疗效。方法　对 1996年 7月～ 1999年 9月 ,采用胫骨内侧高位楔形截骨结合髂骨植骨钢板内固定术治疗 19例 (2 6膝 )膝关节骨性关节炎伴膝内翻畸形 ,病程 1～ 2 4年 ,平均 6 .3年 ,按 Ahlback分类 度 10膝 , 度 9膝 , 度 6膝 , 度 1膝。患者术前、术后 8周和术后 2年进行患肢全长 X线片检查 ,测量胫股角、胫骨角、股骨角、胫股关节面切线夹角及胫股内侧关节间距大小。按膝关节功能评定标准 ,评定术后膝关节功能恢复情况。　结果　 19例 (2 6膝 )术后获随访 2 4～ 4 5个月 ;术后 2年随访膝关节功能自 (4 8.6± 16 .6 )分增至 (81.7± 14 .8)分 ,胫股内侧关节间距自 (2 .2± 1.6 ) mm增至 (4 .9± 1.5 ) mm,胫股关节面切线夹角自 7.4°± 3.1°减少至 1.7°± 3.1°。植骨愈合满意 ,无膝内翻复发。术中出现关节内骨折 1例 ;皮肤感染 2例。结论　胫骨内侧高位楔形截骨结合植骨钢板内固定 ,可作为治疗伴有膝内翻畸形的膝关节骨性关节炎的有效方法之一。     

膝关节类风湿性关节炎并发严重屈曲畸形的假体置换

我们自1985年至2000年,共对78例(103膝)屈曲畸形超过60°的患者施行全膝关节置换术(TKR),取得了良好的效果。 1 资料与方法 本组共78例(103膝),男性25例,女性53例。年龄20～90岁,平均48.2岁。术前平均屈曲畸形78°(65°～110°),其中术前屈曲畸形超过90°者23例(36膝),术中证实有纤维性粘连者15例(24膝)。15例(24膝)术前胫骨向后或向外侧半脱位。27膝伴有内翻畸形平均22°(5°～30°),16膝伴有外翻畸形平均12°(10°～30°)。根据ARA诊断标准分级,成人类风湿性关节炎72例,幼年性类风关6例。随访1.4～15年,平均7.6年。 6例双膝均有高度屈曲畸形的患者同时行髂腰肌松解术,15例同时伴有髋病变者同期或分期行TKR。所用假体:进口人工膝50个,国产人工膝53个;后稳定性假体58个,保留后交叉韧带假     

胫骨高位截骨术治疗膝关节骨性关节炎

自1990年5月～1995年12月,应用膝关节外固定加压融合器行高位胫骨截骨术(HTO)治疗伴有膝内翻畸形的骨性关节炎10例10膝,并随访6个月～5年半,平均3年9个月.术后结果,股胫角(FTA)由术前平均184.7°矫正到平均170.3°.评分由术前平均47分,增加到平均85分.手术采用胫骨楔形截骨,双斯氏针加压外固定,术中同时行胫骨远端前移1cm,以改善髌股关节的负重关系.     

旋转铰链型人工膝关节临床应用近期疗效观察

目的探讨旋转铰链型人工膝关节临床应用的近期疗效。方法2002年7月～2005年4月，应用旋转铰链型人工膝关节假体进行全膝关节置换术治疗膝关节严重畸形和不稳定17例17膝。其中男8例，女9例；年龄41～79岁，平均59岁。左侧10例，右侧7例。患者均因膝关节疼痛人院，病程1～7年。其中骨性关节炎10例，类风湿性关节炎5例，左股骨骨折术后创伤性关节炎1例，左胫骨平台骨折术后创伤性关节炎合并前交叉韧带、内侧半月板损伤及内侧侧副韧带断裂1例。术前HSS（hospital for special surgery）评分36-58分，平均48．6分；术前膝关节屈曲活动度21～80°，平均57．4°。结果术后患者均获随访7个月～3年，平均23．6个月。无下肢静脉血栓形成或肺栓塞，无腓总神经麻痹、骨折或伸膝装置断裂等并发症发生。1例患者术后3个月出现迟发感染，再次手术取出假体，应用抗生素骨水泥间隔行膝关节旷置待二期置换。其余16例最后随访时，HSS评分78～98分，平均91．1分，较术前平均增加45．5分，且差异有统计学意义（P〈0．05）；术后2周，膝关节屈曲活动度为75～100°，平均85．2°，最后随访时膝关节屈曲活动度为85～123°，平均108．3°，与术前比较差异有统计学意义（P〈0．05）。结论旋转铰链型人工膝关节置换术近期疗效肯定，远期疗效尚待进一步随访。     

重症类风湿性关节炎膝关节屈曲挛缩畸形全膝关节置换术的软组织平衡

目的 探讨重症类风湿性关节炎膝关节屈曲挛缩畸形患者行全膝关节置换(total knee arthroplasty,TKA)软组织平衡的方法及疗效. 方法 1997年11月-2006年5月,收治38例重症类风湿性关节炎膝关节屈曲挛缩畸形患者.男8例,女30例:年龄48～71岁,平均58.2岁.病程2年4个月～16年,平均7.6年.术前膝关节屈曲挛缩(38.2 4±11.3)°,关节活动度为(49.1 q±17.8)° HSS评分为(23.9 q±16.9)分.患者均初次行双侧TKA.术前根据屈曲挛缩畸形程度分为轻度(≤20°)5例,中度(20～60°)26例,重度(≥60°)7例.术中在准确截骨的基础上,对于不同程度的膝关节屈曲畸形采取不同的软组织平衡方法,将软组织松解与平衡归结为后房室结构的松解、内外侧副韧带的平衡等. 结果 术中除5例膝关节残留5～10°屈曲挛缩畸形外,33例患者膝关节均能完全伸直.术后3～6 d 5膝发生下肢深静脉栓塞,术后1周3膝出现皮下浅部感染,经对症处理后愈合.38例患者均获随访,随访时间10个月～8年,中位随访时间37个月.患者膝关节屈曲挛缩度为(2.4 4±5.7) °,关节活动度为(96.3 4±14.6) °,膝关节HSS评分为(81.7 4±10.4)分,与术前比较差异均有统计学意义(P<0.05).HSS评分获优27例(71.05%),良6例(15.79%),可5例(13.16%),优良率达86.84%. 结论 软组织平衡是矫正膝关节屈曲挛缩畸形的主要手段,合理的软组织平衡可避免过量截骨,使屈曲挛缩的膝关节在TKA术后获得明显的畸形矫正、活动度增加和功能恢复.     

人工膝关节表面置换治疗类风湿性关节炎屈膝畸形

目的探讨人工全膝关节置换术治疗类风湿性关节炎屈膝畸形的临床效果。方法选用后稳定型钴合金假体对21例类风湿性关节炎屈膝畸形患者进行人工全膝关节置换术,其中单侧膝关节置换5例,双侧膝关节置换16例,手术前后对患者的膝关节功能进行评分。结果随访1~5年,术前患者平均膝评分(22.84±6.06)分,平均功能评分(12.86±16.09)分;术后2周平均膝评分(70.16±2.71)分,平均功能评分(58.10±8.14)分;术后12周随访平均膝评分(86.14±3.12)分,平均功能评分(89.05±3.01)分。结论人工全膝关节置换术能显著纠正类风湿性关节炎屈膝畸形患者膝关节的畸形,解除疼痛,改善患膝的功能。     

膝关节内翻屈曲畸形全膝关节置换的软组织平衡

目的探索对膝关节内翻屈曲畸形患者施行的全膝关节置换（total knee arthroplasty,TKA）软组织平衡技术。方法2001年1月～2005年12月,对实施的86例104膝骨性关节炎（osteoarthritis,OA）行TKA的膝内翻屈曲畸形患者进行回顾性研究,对术中的软组织平衡问题进行讨论。其中男19例23膝,女67例81膝;年龄57岁～78岁,平均66岁。行单侧TKA术68例,双侧18例。均为初次行TKA的OA患者。术前内翻角为6～34°,平均12.3°;其中软组织性内翻占总内翻角的56.7%,骨性内翻占43.3%。术前膝关节屈曲挛缩畸形10°以下21膝,10～19°45膝,20～29°22膝,30°以上16膝,平均18.9°。结果患者术前膝关节平均屈曲挛缩18.9°,术中除4例残留5°屈曲挛缩外,其余患者术中膝关节均能达到完全伸直。术后随访6～72个月,平均37个月,6例残留5～10°屈曲挛缩,余膝关节可达到完全伸直。术前内翻角6～34°,平均12.3°;术后测量股胫角170.3～175.6°,平均174.7°,其中2例残留内翻角〉3°。术中、术后发生并发症6例,其中内侧副韧带股骨起点损伤2例;髌骨弹响2例;脑栓塞及腔隙性脑梗塞各1例,经内科治疗后未遗留神经症状。均无皮肤坏死、切口感染及深部感染发生。结论软组织平衡是矫正膝关节内翻屈曲挛缩畸形的主要手段,良好合理的软组织平衡可使高度畸形的膝关节在TKA术后获得明显的功能恢复和畸形矫正。     

膝关节骨关节炎全膝关节置换术后疗效影响因素的分析

目的探讨后方稳定型膝关节置换术（PSKA）治疗膝关节骨关节炎的术后疗效及其受影响的因素。方法1998年1月～2007年4月，应用PSKA对67例（110膝）骨关节炎患者行手术。以术后膝关节功能（HSS）评分和各单项评分的改善率评定PSKA术后疗效；采用Pearson相关分析对PSKA术后HSS评分与术前患者自身的有关因素进行相关性分析。结果67例患者获随访14～120个月；平均47个月。术后膝关节HSS评分、疼痛、功能、关节活动度、肌力、屈曲畸形及稳定性评分分别为（85．06±9．53）分，（24．55±5．13）分，（17．94±3．01）分，（12．94±1．21）分，（9．91±0．42）分，（9．90±0．65）分，（9．88±0．10）分，均较术前均有不同程度改善（P〈0．05）。疗效评定优良率为98．18％。10膝发生局部并发症。随访1年有并发症的患者膝关节优良率（60．00％）明显低于无并发症患者（98．70％）（P〈0．05），随访2年二者无明显差异。相关分析显示PSKA术后HSS评分与单／双膝接受PSKA、术后康复方式、膝关节术前HSS评分、疼痛和功能评分相关（P〈0．05）；而与患者术前关节活动度、肌力、屈曲畸形、稳定性、年龄、体重和体重指数等无相关（P〉0．05）。结论采用PSKA是治疗重症膝关节骨性关节炎的有效方法。术后疗效与单／双膝接受PSKA、术后半年康复方式有关，与术前膝关节HSS评分、疼痛和功能评分呈正相关；并发症的发生对术后1年疗效有明显负面影响，2年以上则无关。     

Association of increased knee flexion and patella clunk syndrome after mini-subvastus total knee arthroplasty

This study reviewed 747 consecutive posterior stabilized total knee arthroplasty (TKA) to explain the increased incidence of patella clunk syndrome that occurred when the surgeon switched from a medial parapatellar arthrotomy to a mini-subvastus (MIS) TKA technique. The incidence of patella clunk syndrome increased with increased postoperative knee flexion. Six weeks after surgery, knees that developed patella clunk had a mean flexion of 124 degrees vs 117 degrees for knees that did not develop this syndrome (P = .016). As the MIS approach resulted in increased knee flexion, this approach was indirectly associated with the increased incidence of patella clunk. Knee flexion at 6 weeks postoperatively was 117 degrees for the MIS knees vs 108 degrees for traditional medial parapatellar arthrotomy knees (P < .001). The effect of increased knee flexion achieved with the MIS approach, which resulted in an increase in patella clunk, was mitigated by using a new posterior stabilized femoral component designed to minimize soft tissue entrapment.     

术前活动度对人工全膝关节置换术后功能影响的观察

目的回顾性分析患者手术前的活动度对人工全膝关节置换(TKA)术后功能的影响。方法随访2000年1月—2003年12月在我科行TKA的患者65例(97膝),年龄64．8±9．9岁(35～85岁)。其中骨性关节炎55例(81膝),类风湿关节炎10例(16膝)。单膝置换33例,双膝同时置换32例。所有患者按术前膝关节活动度数(ROM)分成两组,≤90°(5°～90°)49膝,>90°(95°～140°)48膝。对两组患者进行疗效(最大屈膝度、活动度、KSS评分及功能评分)对比。所有患者均采用Scorpio后稳定型骨水泥固定的假体,均为初期置换,全部手术由同一组医师完成。术后3 d在同一康复师指导下行患肢CPM及主动功能锻炼至出院。结果平均随访时间29个月(10～44个月)。所有膝关节的活动度从术前的平均84．2°(5°～140°)提高到术后的平均101．6°(40°～140°) (P=0．000);而最大屈膝度数术前的平均103．5°(25°～140°)与术后的平均101．6°(40°～140°)无显著差异(P=0．439);KSS膝关节评分从术前平均19．5分(-24～62分)提高到术后平均78．8分(50～95分)(P=0．000)。所有患者的总满意度为93．8％(61／65)。两个分组比较,ROM≤90°的膝关节ROM及最大屈膝度术后均较术前有提高,而ROM>90°的膝关节平均最大屈膝度术后反而下降。没有翻修及深部感染。结论(1)在影响TKA术后膝关节功能的多种因素中,手术技术是关键因素。(2)在其他因素相同的情况下,术前膝关节的活动度对TKA术后的功能也有很大的影响,术前活动度大的膝关节比那些术前活动度小的膝关节术后能获得更好的功能。     

Knee stability in posterior cruciate ligament retaining total knee arthroplasty

Anteroposterior knee laxity was evaluated in 14 patients (19 knees) who had posterior cruciate ligament retaining total knee arthroplasty using the Miller Galante I prosthesis. The followup ranged from 87 to 118 months (average, 105.9 months), and the measurements were done using the KT-2000 arthrometer. The mean anteroposterior displacement with the knees with Miller Galante I prostheses was 10.1 mm at 30 degrees flexion and 8.1 mm at 75 degrees flexion. In the 15 knees with Miller Galante I prostheses with flexion greater than 90 degrees, seven had less stability at 75 degrees than at 30 degrees flexion. These knees were considered to have a nonfunctional posterior cruciate ligament, and they had a worse Knee Society score (81.1) than did the other eight knees with Miller Galante I prostheses (89.9). There were four knees in which the flexion was less than 90 degrees. In this study, approximately half of the knees with posterior cruciate ligament retaining total knee arthroplasty did not have good anteroposterior stability in flexion an average of 9 years after surgery.     

后稳定型全膝关节假体置换术后疗效分析

目的　分析后稳定型全膝关节假体置换术的处理方式、手术经验及疗效。方法　对 14例15膝行关节置换 ,使用Apollo后稳定型假体 ,单膝关节置换 13例 ,双膝同期置换 1例。原发疾病为类风湿性关节炎 3例 4膝 ,骨关节炎 11例 11膝。术后随访时间平均 11个月。结果　 15个膝关节术前伸曲活动度平均 75°,全膝关节置换术后 2个月关节活动度恢复至平均 10 0°。 14例患者均可自如行走、上下楼梯 ,膝关节稳定性好。 1膝术后脂肪液化致表层伤口裂开 ,清创后愈合 ,余膝术后伤口均愈合良好。结论　后稳定型假体植入的全膝关节置换手术方式简单、疗效肯定、术后并发症少。     

Radiographic analysis of low contact stress meniscal bearing total knee replacements

BACKGROUND: Meniscal bearing total knee replacements were developed to decrease the contact stresses on polyethylene and to reduce polyethylene wear. The kinematics of meniscal bearing knee replacements is poorly understood. The present study was designed to evaluate, with radiographic analyses, the motion of the meniscal bearings and the femoral rollback of the Low Contact Stress meniscal bearing knee replacement during knee flexion. METHODS: Eighty-one Low Contact Stress meniscal bearing total knee replacements in seventy-six male patients were assessed on fluoroscopically centered lateral radiographs made with the knee in full extension and in full flexion at an average of six years (range, twenty-four to 147 months) after the operation. The distance and direction of motion of the meniscal bearings and the center contact position of the femoral condyles were measured. Knee evaluations were performed with use of the Knee Society rating system. RESULTS: The average range of motion of the knees, measured on lateral radiographs, was 90 degrees (range, 45 degrees to 136 degrees). As they moved from terminal extension to terminal flexion, thirty-nine knees (48%) exhibited anterior motion of both bearings and sixteen (20%) demonstrated posterior motion of both bearings. Ten knees (12%) had reciprocal motion of the two bearings (one bearing moving anteriorly and one bearing moving posteriorly) with flexion, nine knees (11%) had motion of only one bearing, and seven knees (9%) had no motion of either bearing. When moving from full extension to full flexion, eighteen knees (22%) demonstrated femoral rollback, six knees (7%) showed no change in the position of femoral contact, and fifty-seven knees (70%) exhibited anterior sliding of the femoral condyles. Flexion of the knees demonstrating femoral rollback averaged 104 degrees (range, 76 degrees to 128 degrees), and flexion of the knees demonstrating anterior sliding averaged 94 degrees (range, 45 degrees to 125 degrees). The difference was significant (p = 0.03). According to the Knee Society rating system, the average clinical score for the entire group was 76 points (range, 27 to 100 points) and the average functional score for the entire group was 72 points (range, 30 to 100 points). The average clinical score was 79 points (range, 27 to 98 points) for the knees that exhibited anterior sliding of the femoral condyles and 87 points (range, 52 to 100 points) for those exhibiting femoral rollback (p = 0.09). The average functional scores were 64 points (range, 30 to 100 points) and 72 points (range, 45 to 100 points), respectively (p = 0.15). CONCLUSIONS: Radiographic analysis of meniscal bearing total knee replacements demonstrated an average anterior motion of both the medial and the lateral meniscal bearing of 4.7 mm (range, 1 to 14 mm) in thirty-nine knees (48%) as they moved from terminal extension to terminal flexion. Sixty-three knees (78%) demonstrated no femoral rollback as they were flexed. Knees with anterior sliding of the condyles had a significantly smaller average range of flexion (p = 0.03) and a lower average Knee Society score than did knees demonstrating femoral rollback. We believe that lack of rollback indicates a functional insufficiency of the posterior cruciate ligament.     

Autogenous bone grafting for severe angular deformity in total knee arthroplasty

Fourteen patients with severe angular knee deformities (range, 30 degrees varus to 35 degrees valgus) had total knee arthroplasty using autogenous bone graft to the tibia. Twelve knees had osteoarthritis, one rheumatoid arthritis, and one gouty arthritis. The preoperative knee motion averaged -5 degrees of extension to 80 degrees of flexion and the average motion arc was 70 degrees. All tibial defects were greater than 25% of the tibial component support surface and more than 10 mm deep. Twelve knees were reconstructed with Insall-Burstein posterior stabilized total condylar knee implants and two knees, with severe preoperative ligamentous instability, with the constrained Total Condylar III implant. Postoperative rehabilitation was routine, and weight bearing was begun, on average, on the third postoperative day. The follow-up period averaged 4.1 years (range, 2-7.3 years). Radiographic analysis revealed no change in knee or component alignment compared with immediate postoperative position. All grafts consolidated without evidence of collapse, resorption, or prosthetic subsidence. All patients had good or excellent clinical results (Hospital for Special Surgery Knee Rating Scale). The average postoperative arc of motion was 90 degrees. There were no infections and no need for implant removal. The technique developed by the senior author (T.P.S.) utilizes bone resected from the distal femur during knee arthroplasty. An oblique planar cancellous surface is created on the recipient side, and coaptation of cancellous distal femoral graft surface to this recipient bed is ensured by vitallium screw fixation. The proximal tibia is reconstituted by the graft, and subchondral femoral bone after shaping of the graft forms the tibial periphery.     

Effect of Implant Design on Knee Flexion

From March 2006 to August 2008, 93 subjects (186 knees) underwent simultaneous bilateral total knee arthroplasty performed by eight surgeons at North American centers. This randomized study was conducted to determine whether non-weight-bearing passive flexion was superior for knees receiving a posterior stabilized high flexion device compared to a posterior stabilized standard device in the contra-lateral knee. Weight-bearing single leg active flexion was one secondary endpoint. Follow-up compliance was 92.5%. Results show small, but significant superiority in the motion metrics for the high flexion device compared to the standard device 12 months after surgery, especially for a subgroup of patients with pre-operative flexion less than 120° in both knees. Thus, the ideal candidate for the high flexion device may be one with lesser pre-operative flexion.     

Unicompartmental knee arthroplasty for osteoarthritis of the knee: remaining postoperative flexion contracture affecting overall results

The success rate of unicompartmental knee arthroplasty has been variable, and controversy still surrounds its use. Achieving good functional results from this surgery may require understanding surgical principles, precise operative techniques, and careful patient selection. This paper evaluates clinical results and factors influencing postoperative knee function after unicompartmental knee arthroplasty. The follow-up assessment of 109 knees that underwent unicompartmental knee arthroplasty showed that 90 of 109 knees were classified as excellent or good (82.6%) using the Hospital for Special Surgery knee scoring system. In the excellent group (54 knees), 52% of the postoperative, standing femorotibial angles converged on a range of 170 degrees to 175 degrees with a mean of 174 degrees +/- 4 degrees. The knees with residual flexion contracture after surgery showed poorer clinical results. Therefore, complete elimination of the flexion contracture during surgery is considered mandatory.