尺骨鹰嘴粉碎性骨折短缩固定后的肘关节功能研究

目的尺骨鹰嘴粉碎性骨折后易出现骨折端短缩,导致肘关节功能障碍。通过尸体解剖实验,以不同的截骨厚度和方向来模拟骨折后尺骨鹰嘴短缩、变小等局部形态变化,探讨其对肘关节屈伸活动的影响。方法取3具新鲜成年男性尸体的双侧上肢标本,在距尺骨鹰嘴顶点25mm处行水平截骨并用两枚螺钉临时固定,再依次截骨1mm、3mm、5mm,测量肘关节的屈伸活动度。然后将标本分成两组,一组继续水平截骨至7mm和8mm,测量肘关节的屈伸活动度;而另一组则依次以5mm、7mm为水平截骨距离,分别采用楔形截骨的方法,观察肘关节屈伸功能的改善度。结果尺骨鹰嘴短缩3mm后原位固定,肘关节屈伸活动无明显受限;若尺骨鹰嘴缺损达5mm,则会因尺骨滑车切迹关节面弧度的改变而导致肘关节的伸直明显受限,将截骨处远端背侧的骨皮质去除3mm行楔形截骨后再固定,肘关节伸直功能还可以恢复正常。但若尺骨鹰嘴短缩达7mm和8mm时,肘关节的伸直受限分别为47°和35°,楔形截骨后也会出现肘关节不稳定。结论如尺骨鹰嘴粉碎性骨折所致的短缩在3mm之内,可行单纯固定,肘关节屈伸功能无明显受限;若短缩在3～5mm之间,仍可以采用短缩原位固定的方法,但应将尺骨鹰嘴后倾固定,使滑车切迹尽量保持原有的弧度;而若短缩达到7～8mm,即使保持滑车切迹的弧度,肘关节伸直仍明     

尺骨鹰嘴部分切除对肘关节稳定性影响的研究

目的探讨尺骨鹰嘴尖部截骨短缩对肘关节稳定性的影响。方法取10具20侧男性新鲜上肢标本，随机分为四组，每组5侧标本，即尺骨鹰嘴完整组、截骨3mm组、截骨6mm组、截骨9mm组，截骨在尺骨鹰嘴尖部。每组分别在肘关节屈曲30°、60°、90°、120°时，前臂加1．96Nm力矩的情况下，测量外翻位肘外翻角度和内侧副韧带前束长度及内翻位肘内翻角度和桡侧尺副韧带长度。结果尺骨鹰嘴尖部截骨时，于同一肘关节屈曲位，随着尺骨鹰嘴尖部截骨量增大，肘关节内侧副韧带前束的长度逐渐变长，外翻角逐渐增大，当截骨量大于3mm上述变化差异显著，有统计学意义（P〈0．05）。结论尺骨鹰嘴尖部截骨量超过3mm时，肘关节出现不稳定。因此临床上当尺骨鹰嘴尖部严重粉碎性骨折片不超过3mm时，可予以手术切除，对肘关节稳定性影响不大，否则应给予修复重建。而对于尺骨鹰嘴尖部后内侧骨赘，建议仅切除骨赘或切除范围不超过正常鹰嘴尖部3mm。     

尺骨鹰嘴粉碎性骨折短缩固定后对肘关节功能影响的临床观察

尺骨鹰嘴粉碎性骨折,特别是位于滑车切迹中段的骨折,固定过程中可能会出现尺骨鹰嘴短缩,使鹰嘴变小和尺骨滑车切迹弧度发生改变,导致肘关节脱位影响肘关节的功能。从2003年至2007年4年期间共收治25例患者进行了尺骨鹰嘴截骨手术，报告如下。     

两种手术入路治疗老年肱骨髁间骨折的疗效分析

目的比较采用尺骨鹰嘴截骨和肱三头肌切开两种不同入路双钢板内固定治疗老年肱骨髁间骨折的疗效。方法对2005年7月至2009年1月收治的47例分别采用尺骨鹰嘴截骨和肱三头肌切开两种不同入路治疗的老年肱骨髁间骨折患者资料进行回顾性分析,观察比较两组患者:①住院时间,骨折愈合时间;②术后3个月肘关节主动屈伸活动范围;③术后3个月肘关节功能采用MEPS肘关节功能评分系统(Mayo elbow performance score,MEPS)进行评定。结果所有患者平均随访(12±2.3)个月。所有患者切口均Ⅰ期愈合,无切口感染及深部感染,无尺神经损伤。两组平均住院时间分别为(17±3.5)天和(18±3.0)天,无统计学意义(P>0.05)。两组骨折愈合时间分别为(7±1.5)周和(7±1.3)周,无统计学意义(P>0.05)。术后3个月肘关节主动屈伸活动范围:A组:屈曲90°～137°,平均125°,伸直0°～27°,平均19°;B组:屈曲90°～129°,平均123°,伸直0°～21°,平均15°。两组无统计学意义(P>0.05)。术后3个月肘关节功能根据MEPS肘关节评分:A组:优9例,良13例,可4例,优良率为84.62%;B组:优2例,良12例,可7例,优良率为66.67%。两组有显著性差异(P<0.05)。A组出现尺骨鹰嘴截骨处内固定松动2例,B组无内固定松动病例,差异有统计学意义(P<0.05)。结论两种手术入路均安全有效,尺骨鹰嘴截骨入路较肱三头肌切开入路可获得更为满意的临床效果,但增加了内固定松动的风险。     

尺骨冠突骨折对肘关节稳定性的影响

目的探讨不同程度尺骨冠突骨折对肘关节稳定性的影响。方法采用11具22侧新鲜成人尸体的上肢标本,在6侧上肢上测量尺骨冠突的高度,滑车切迹开口纵径,开角的大小以及冠突1/2高度处在冠状面的宽度,矢状面的厚度等。在分别距尺骨冠突尖2mm、冠突高1/4处、冠突高1/2处、冠突高3/4处和冠突基底处截骨,测量肘关节的伸屈活动度及稳定性。另16侧上肢随机分成两组,在冠突高1/2处截骨行内固定,一组不修复尺侧副韧带前束,而另一组修复尺侧副韧带前束,分别观测伸屈时肘关节外翻角度的变化。结果尺骨冠突截骨高度不超过冠突高的1/4时,肘关节伸屈稳定性不受影响;当截骨高度达冠突高的1/2以上时,肘关节稳定性明显受影响,活动时会出现半脱位或后脱位,同时尺侧副韧带前束受损;而当尺骨冠突截骨再复位内固定后,尺侧副韧带前束断裂不修复与修复之间,肘关节屈曲0°、30°、60°、90°和120°其外翻角度有显著增加(P<0.05),肘关节不稳定,证实尺侧副韧带前束在抗外翻应力方面有重要作用。结论尺骨冠突骨折不超过冠突原高度的1/4时,对肘关节稳定性无显著影响,有手术摘除碎骨片不会影响肘关节功能;当尺骨冠突骨折超过原高度的1/2合并有尺侧副韧带前束损伤时,会明显影响肘关节稳定性,在行复位内固定的同时,应修补或重建韧带以稳定     

老年肱骨髁间骨折经尺骨鹰嘴截骨手术治疗的研究

目的探讨老年患者肱骨髁间骨折经尺骨鹰嘴截骨手术内固定的临床疗效。方法对2007年7月至2009年7月收治的22例老年肱骨髁间骨折行尺骨鹰嘴截骨切开复位双钢板内固定治疗的临床效果进行回顾性分析。男8例,女14例;年龄60～79岁,平均69．2岁。按Riseborough分型,Ⅰ型2例,Ⅱ型6例,Ⅲ型10例,Ⅳ型4例。术后采取影像学、Mayo肘关节功能评分、上肢肩手功能障碍评分进行评价。结果所有患者均获随访,随访时间12．6～35．8个月,平均25．7个月。X线片显示肱骨远端前倾角12°～28°,平均22°,关节面台阶均小于2mm。除了1例严重肘关节功能障碍外。其余肘关节平均屈曲角度为106°,平均伸直角度丢失25°。Mayo评分为50～94分,平均77．2分,优5例,良10例,可3例,差4例,优良率为68．2％。上肢肩手功能障碍评分为24．7分。并发症包括2例肱骨髁上延迟愈合伴内固定失效,1例鹰嘴骨不连,1例严重的肘关节僵硬,2例尺神经麻痹。结论经尺骨鹰嘴截骨双钢板内固定治疗老年肱骨髁间骨折可以获得较好的关节功能恢复,但手术治疗在老年患者严重骨质疏松且骨折粉碎严重时需要慎重。     

尺骨鹰嘴截骨入路双钢板内固定治疗肱骨髁间骨折

目的观察采用经尺骨鹰嘴截骨入路双钢板内固定治疗肱骨髁间骨折的疗效。方法对26例肱骨髁间C型骨折采用肘后正中切口尺骨鹰嘴截骨入路双钢板内固定治疗。结果本组获随访12~20个月,出现1例尺神经病变,1例异位骨化。末次随访,肘关节屈曲95~135°,平均120°;伸直丢失15~40°。根据Mayo评分系统:优8例,良14例,可4例,优良率84.6%。结论采用经尺骨鹰嘴截骨入路双钢板内固定治疗肱骨髁间骨折具有显示术野清晰,提供牢固内固定,可早期进行功能锻炼等特点,值得推广应用。     

尺骨冠状突骨折治疗体会

尺骨冠状突是尺骨半月关节面前端的骨突,为肱肌副附着点.可阻止尺骨向后脱位,防止肘关节过度屈曲,对维护肘关节的稳定性起重要作用[1].当高处坠落或摔倒时,肘关节过伸,暴力沿尺骨向上传导,冠状突与肱骨滑车相撞而骨折.此外,肱肌急剧收缩亦可造成冠状突骨折.成人口J伴肘关节脱位,青少年可伴尺骨鹰嘴、桡骨小头及髁部骨折,这些并发骨折亦应相应处理,选择适宜治疗方法.     

2.0 mm和2.5 mm直径螺钉固定钛合金尺骨冠突假体稳定性的有限元分析

目的比较直径2.0 mm与2.5 mm螺钉固定基于正常人群肘关节形态而完成的3D打印钛合金尺骨冠突假体的力学稳定性。方法通过对正常骨性结构的成年受试者的肘关节进行CT扫描并行三维重建后设计尺骨冠突假体,分别模拟使用直径为2.0 mm及2.5 mm的螺钉进行固定。对屈肘30°、90°、130°下两种直径螺钉固定尺骨冠突假体的稳定性进行有限元分析并比较其等效应力峰值和假体最大位移量。结果肘关节屈曲30°时,2.0 mm组螺钉与2.5 mm组螺钉的等效应力峰值分别为56.29 MPa及39.96 MPa,假体最大位移量分别为0.0380 mm及0.0290 mm;肘关节屈曲90°时,2.0 mm组螺钉与2.5 mm组螺钉等效应力峰值分别为8.97 MPa及8.12 MPa,假体最大位移量分别为0.0065 mm及0.0058 mm;肘关节屈曲130°时,2.0 mm组螺钉与2.5 mm组螺钉等效应力峰值分别为10.03 MPa及9.32 MPa,假体最大位移量分别为0.0079 mm及0.0066 mm。两种螺钉固定方式的最大等效应力均位于螺钉的顶帽与顶杆螺纹交界处,直径2.5 mm螺钉的等效应力峰值在同一屈曲角度时较2.0 mm螺钉低;在尺骨冠突假体位移方面,不论何种屈曲角度,2.5 mm螺钉固定的假体位移量均较2.0 mm螺钉小。结论直径2.5 mm螺钉较2.0 mm螺钉固定3D打印钛合金尺骨冠突假体固定更稳定。     

尺骨鹰嘴截骨入路内固定治疗成人肱骨远端陈旧骨折

目的 探讨尺骨鹰嘴截骨入路内固定治疗成人肱骨远端陈旧骨折的疗效。方法 采用尺骨鹰嘴截骨入路内固定治疗14例成人肱骨远端陈旧骨折患者。记录骨折复位情况、骨折愈合情况、肘关节活动度，采用改良An-Morrey肘关节评分标准评价疗效。结果 患者均获得随访，时间10～18(11.8±1.6)个月。术后4周X线片显示骨折对位对线良好，内固定牢靠，有骨痂形成。骨折均愈合，时间12～24周。末次随访时，采用改良An-Morrey肘关节评分标准评价疗效：优10例，良3例，可1例，优良率13/14;肘关节屈曲80°～140°(109.6°±12.2°),前臂内旋75°～80°(77.3°±2.1°)、外旋78°～82°(79.8°±2.7°)。结论 尺骨鹰嘴截骨入路内固定治疗成人肱骨远端陈旧骨折，术野暴露充分，清创、复位、内固定操作方便，且内固定牢靠，患者可早期功能锻炼，肘关节功能恢复良好。     

Subchondral bone density in the human elbow assessed by computed tomography osteoabsorptiometry: A reflection of the loading history of the joint surfaces

The functional adaptation of bone tissue to the mechanical stresses acting on it has been convincingly established. This association should apply as well to the subchondral bone, reflecting the long-term distribution of stress over the joint surfaces. Thirty-six specimens of the human elbow joint were investigated by computed tomography osteoabsorptiometry in order to assess the distribution of he subchondral mineralization. The distal surfaces usually were more highly mineralized than the proximal components of the joint, whereas the humeroulnar and the humeroradial parts exhibited a similar degree of mineralization. The fovea of the radial head always showed a central density maximum, and the trochlear notch usually presented a bicentric distribution pattern, with maxima beneath the ventral and dorsal regions of the articular surface. The different patterns of subchondral mineralization were shown to reflect the loading history of the overlying articular surfaces, which is determined mainly by geometrical factors. The flatter socket of the humeroradial joint leads to central load transmission, but the deeper socket of the humeroulnar joint will, by contrast, give rise to bicentric stress distribution.     

Chondromalacia of trochlear notch after healing of olecranon stress fracture: a case report

Introduction: Chondromalacia of the trochlear notch and stress fracture of olecranon are uncommon injuries in the throwing athletes. Materials and methods: We report an 18-year-old high school pitcher who had persistent postero-lateral elbow pain after a healed olecranon stress fracture of the right elbow. Diagnostic arthroscopy revealed chondromalacia of the trochlear notch. Results: After treatment with arthroscopic drilling and abrasion chondroplasty, he returned to competitive pitching 1 year later postsurgery. This rare association between chondromalacia and stress fracture of the olecranon has not been reported previously in the literatures. Conclusion: Chondromalacia of the trochlear notch should be included as a differential diagnosis in evaluating athletes with persistent elbow pain after healed olecranon stress fractures.     

经鹰嘴肘关节骨折脱位的骨折特点及手术策略

目的探讨经鹰嘴肘关节骨折脱位的骨折特点及手术策略。 方法回顾性分析2013年1月至2018年1月山东大学附属省立医院采用切开复位内固定治疗的24例经鹰嘴肘关节骨折脱位患者的临床资料及随访结果，其中男性13例，女性11例。年龄25 ~ 64岁，平均36.4岁。受伤原因为：交通伤12例、高坠伤6例、摔伤6例。尺骨鹰嘴横型或斜型骨折4例，粉碎性骨折20例；合并冠突骨折15例，根据Regan-Morrey分型均为III型；合并桡骨头骨折2例。受伤至手术时间为7 ~ 19 d，平均10.5 d。所有患者均采用肘关节后方正中入路复位固定冠突、桡骨头和尺骨鹰嘴骨折，恢复滑车切迹解剖完整性。其中2例患者因冠突固定欠佳，加用肘前方入路复位固定冠突骨折。 结果所有患者术后均获得随访，随访时间12 ~ 24个月，平均13.2个月。所有骨折均获得骨性愈合，平均愈合时间为（2.8±0.5）个月。术后12个月Mayo肘关节功能评分平均为（85.1±4.1）分,其中优8例，良12例，可4例，优良率83.3%。所有患者末次随访均未出现创伤性关节炎、肘关节不稳定、骨折不愈合等并发症。 结论经鹰嘴肘关节骨折脱位是一种发病率较低的复杂损伤，可涉及尺骨鹰嘴、冠突及桡骨头骨折。良好地复位及牢固固定各骨折块，尤其是滑车切迹的平整，同时术后积极规范的功能锻炼，可以获得很好的临床效果。     

Partial posteromedial olecranon resection: a kinematic study

BACKGROUND: The posteromedial aspect of the olecranon process is a site of impingement and subsequent osteophyte development in throwing athletes. Treatment with débridement, with resection of osteophytes and varying amounts of normal olecranon bone, is common. We found no reports in the literature concerning the effects of resecting different amounts of normal bone from the posteromedial aspect of the olecranon. We hypothesized that excessive resection would increasingly alter elbow kinematics and that an optimum amount of olecranon resection could be identified. METHODS: We investigated the kinematic effects of increasing valgus and varus torques and posteromedial olecranon resections, in twelve cadaveric elbows, with use of an electromagnetic tracking device. Two valgus and two varus torques were applied, and three sequential resections were performed in 3-mm steps from 0 mm to 9 mm. Statistical analyses included paired t tests, 95% confidence intervals, a one-factor analysis of variance with repeated measures, and a post hoc test when significance was established. RESULTS: Sequential partial resection of the posteromedial aspect of the olecranon resulted in stepwise increases in valgus angulation with valgus torque. Clear differences were seen at each level of resection. A pattern of increased valgus angulation also was seen in association with increased valgus torque. Increased valgus torque resulted in a trend toward increased axial internal rotation of the ulna, whereas increased osseous resection resulted in a decrease in the absolute degree of internal rotation or, in some specimens, increased external rotation. CONCLUSIONS: Although no single critical amount of olecranon resection was identified, valgus angulation of the elbow increased in association with all resections, with a marked increase occurring in association with a 9-mm resection. Our findings challenge the rationale of removing any amount of normal olecranon bone in throwing athletes as doing so may increase strain on the medial collateral ligament. The implications for the professional throwing athlete are important, and we recommend that bone removal from the olecranon be limited to osteophytes, without the removal of normal bone.     

Fractures of the olecranon: an in vitro study of elbow joint stresses after tension-band wire fixation versus proximal fracture fragment excision

BACKGROUND: Displaced fractures of the olecranon usually require operative treatment, by either open reduction with internal fixation (ORIF) or excision of the proximal fragment. However, the relative merits of these treatment options have not been fully delineated. One treatment outcome measure of joint function is residual intra-articular stress. The purpose of this study was to evaluate the effect of these two types of olecranon fracture treatment on humeroulnar joint stress. METHODS: Eight matched pairs of fresh frozen cadaveric upper extremities were thawed; stripped of skin, muscular, and neurovascular tissue; and potted in polymethylmethacrylate. The intra-articular humeroulnar joint peak pressures were measured at 90 degrees of elbow flexion using pressure-sensitive film after application of a 0.15 kg-m torque through the remaining triceps muscle attachment. First, pretreatment (normal) pressures were obtained from the major contact regions of the humeroulnar joint. A 50% olecranon osteotomy was then performed simulating a fracture, and the elbows from each of the paired specimens were randomly assigned to one or the other of two treatment groups: ORIF (using a tension-band wiring technique) and proximal fragment excision. Joint pressures were remeasured. A two-tailed paired t test was used for statistical analysis. RESULTS: After osteotomy, the peak pressures were higher, overall, in the excision group. Comparing each posttreatment experimental group to its pretreatment (normal) counterpart revealed that the peak pressures in the distal medial and distal lateral articular subzones were significantly higher for the fragment excision group (p = 0.005 and p= 0.0008, respectively), but were not significantly different in the ORIF group (p = 0.545 and p= 0.153, respectively). CONCLUSION: The findings of this study indicate that ORIF restores the normal biomechanics of the elbow joint and proximal fragment excision results in abnormally elevated joint stresses. These elevated joint stresses may, over time, contribute to the development of elbow pain and osteoarthrosis. Therefore, ORIF should continue to be regarded as the treatment of choice for displaced fractures of the olecranon involving large proximal fracture fragments similar in size to those in this study.     

Outcomes of intramedullary nail fixation through the olecranon apophysis in skeletally immature forearm fractures

The objective of this study was to quantitatively investigate the long-term radiologic and functional outcomes of antegrade intramedullary (IM) nailing through the olecranon apophysis for ulnar fractures in skeletally immature patients. A retrospective review was conducted of skeletally immature patients with ulnar fractures that had antegrade IM nail fixation through the olecranon apophysis. Patients were excluded if they had a previous forearm fracture or a fracture of the contralateral forearm. Functional measures included the Activities Scale for Kids (ASK) questionnaire for patients younger than 15 years of age and the Disabilities of the Arm, Shoulder and Hand (DASH) questionnaire for patients older than 15 years of age. Forearm range-of-motion measurements were collected from the fractured forearm and the contralateral control forearm. Radiologic outcomes were evaluated for ulnar, olecranon, coronoid, and trochlear notch proportions. Nineteen patients were evaluated. The average age at operation was 10.8 years (range 1.6-15.9) and the mean follow-up time was 3.4 years (range 1.2-7.2). Nine patients completed the ASK questionnaire, with a mean score of 93.9 (range 68.9-100), and 10 patients completed the DASH questionnaire, with a mean score of 6.0 (range 0-35). The mean fractured forearm supination was 103.2 degrees compared with 109.2 degrees on the control forearm (P < 0.05). Furthermore, the mean fractured forearm trochlear notch width was 17.7 mm compared with 17.1 mm on the control forearm (P < 0.05). Similarly, the mean fractured forearm trochlear notch height was 16.5 mm compared with 17.0 mm on the control forearm (P < 0.05). This retrospective review suggests that antegrade IM nail fixation through the olecranon apophysis for ulnar fractures in skeletally immature patients is a safe procedure. There is no significant ulnar length disruption or functional limitations, despite the differences in trochlear notch measurements and supination between the fractured and control forearms. Overall, IM nail fixation through the olecranon apophysis for surgically indicated ulnar fractures has minimal outcome limitations, with no evidence of prospective growth disruption. A larger randomized prospective trial should be conducted to strengthen the evidence of this study.     

In vivo elbow biomechanical analysis during flexion: three-dimensional motion analysis using magnetic resonance imaging

The purpose of this article is to evaluate in vivo 3-dimensional kinematics of the elbow joint during elbow flexion. We studied the ulnohumeral and radiohumeral joint noninvasively in 3 elbows in healthy volunteers using a markerless bone registration algorithm. Magnetic resonance images were acquired in 6 positions of elbow flexion. The inferred contact areas on the ulna against the trochlea tended to occur only on the medial facet of the trochlear notch in all of the elbow positions we tested. The inferred contact areas on the radial head against the capitellum occurred on the central depression of the radial head in all of the tested elbow positions except for 135 degrees flexion, where the anterior rim of the radial head articulates with the capitellum.     

膝关节内侧固定平台单髁假体放置位置优化的有限元分析

目的探讨股骨组件及胫骨组件冠状面位置变化对股骨及胫骨生物力学的影响。方法取1名汉族男性志愿者的左侧膝关节CT及MRI图像,建立正常膝关节三维有限元模型(finite elemental model,FEM)。设计股骨组件及胫骨组件内翻6°、内翻3°、0°、外翻3°、外翻6°,组合成25个膝内侧单髁置换FEM。沿股骨机械轴加载1000 N载荷,观察von Mises云图应力分布,测量外侧间室载荷比例,测量胫骨组件下方松质骨及内侧皮质骨、聚乙烯衬垫上表面、外侧间室股骨软骨高接触应力值。将与中立位(胫骨及股骨假体内外翻0°、胫骨假体后倾5°)比较有统计学意义的指标通过散点图标识,找出点项目密集区和稀疏区,比较两区有统计学意义的项目数量,确定股骨组件、胫骨组件优化位置。结果股骨组件0°位放置时,胫骨从内翻6°至外翻6°各组合的胫骨组件下方松质骨高接触应力差异无统计学意义;胫骨组件0°位放置时,股骨组件内翻6°、外翻6°组件下方松质骨高接触应力值与中立位比较增加(9.21±3.38)MPa和(9.08±4.13)MPa(P<0.05)。股骨、胫骨组件从内翻6°至外翻6°变化时,胫骨下方内侧皮质骨高接触应力值逐渐下降(P<0.05)。股骨组件0°位放置时,胫骨组件从内翻6°至外翻6°各组合聚乙烯衬垫上表面高接触应力值的差异无统计学意义;胫骨组件0°位放置时,股骨组件内翻6°、外翻6°组与中立位组比较分别增加(2.88±2.53)MPa和(3.47±2.86)MPa(P<0.05);股骨及胫骨组件从内翻6°至外翻6°变化时,外侧间室载荷比例及外侧间室股骨软骨高应力值逐渐下降(P<0.05)。稀疏区(股骨或胫骨从内翻3°至外翻3°的所有组合的集合)有统计学意义的指标比例(2.8%,1/36)明显小于密集区(去除稀疏区以外的所有组合的集合)的比例(57.8%,37/64),差异有统计学意义(χ^2=29.61,P<0.001)。结论在下肢力线正常、关节线不变的条件下,膝关节内侧固定平台单髁假体放置位置为股骨组件、胫骨组件内翻、外翻角度不宜超过3°。