Influence of a high hip center on abductor muscle function

In 20 anatomic specimens with an acetabular defect (type Paprosky 3b), an acetabular component was implanted in the position of a high hip center. The vertical migration of the hip center ranged between 13 and 35 mm. It was accompanied by a lateralization and ventral migration of between 5 and 25 mm. The influence on the different abductor muscles was calculated through computer model comparing muscle force and muscle length before and after implantation of a high hip center. The increase in length of the gluteus maximus muscle and the posterior part of the gluteus minimus muscle ranged between 1% and 6%, while all other evaluated abductor muscles were shortened from 3% to 16%. The effect of the simultaneous changes of the lever arms was an increase in necessary muscle strength for pelvic stabilization from 140% to 250% compared with the original estimated strength prior to implantation. This may lead to insufficiency of the abductor muscles after placement of a high hip center. On the basis of these findings, we do not recommend the implantation of an acetabular component in the position of a high hip center.     

全髋关节置换术髋臼旋转中心的回顾性研究

[目的]通过手术前后对髋臼旋转中心的X线测量，探讨髋臼旋转中心的变化对髋关节平衡稳定性的影响。[方法]追溯调查近年本院收治120例155髋，均为首次行全髋关节置换术患者，对比术前术后双髋关节正位X线片，比较术后髋臼假体的旋转中心（HJC1）与解剖髋臼旋转中心（HJC0）的符合率。[结果]旋转中心恢复者98髋（63．23％）（A组），未恢复者57髋（36．77％）（B组）；A、B两组中因人工髋关节松动、脱位、髋部痛等行髋关节假体翻修术分别为6髋（6．12％）、17髋（29．82％）。[结论]髋臼旋转中心的恢复对人工髋关节置换术后的关节稳定性有直接影响。     

High hip center in revision arthroplasty

What is the effect of superior placement of the acetabulum in complex hip reconstruction? Twenty-two patients (23 cases) had revision hip arthroplasty with superiorly placed porous-coated components without bone-grafts. Cemented femoral components were used in 21 cases and ingrowth components in 2. The average vertical height (corrected for magnification) was 36.8 mm from the interteardrop line, compared to a contralateral normal height of 12.1 mm. Three patients were deceased. The remaining 19 patients (20 hips) had a minimum 2-year follow-up period (average, 35 months). Fourteen hips had two or more previous surgeries. Seven acetabular components had thin (< 1 mm), nonprogressive, incomplete radiolucent lines. One acetabulum had a complete 1 mm radiolucent line in an asymptomatic patient. The remaining 12 acetabular components had no evidence of radiolucent lines and none of the acetabular components migrated. One hip with a cemented femoral component had evidence of possible loosening. Two cemented femoral components had evidence of definite loosening, one with minimal clinical symptoms and the other was revised to a long stem at 14 months after revision. Of the two ingrown femoral components, one had initial subsidence of 1.5 cm and both had thigh pain. All other patients had improved from their preoperative status; however, 4 of 20 hips had moderate to severe pain. Superior cup position did not result in concomitant lateral position. With a shortterm follow-up period however, vertical displacement alone resulted in high loosening rates, with 25% for the femur and 5% for the acetabulum.     

髋关节旋转中心相关骨性参数的测量

目的 了解国人正常髋关节周围的骨性参数,探讨其对高位髋中心技术的影响. 方法 挑选CT表现完全正常且病例资料完整的男女各30例的影像资料,采用专用图像软件测量.测量参数:髋臼上方骨质的厚度、颈干角、偏心距、股骨头直径、骨盆高度及骨盆宽度.将年龄、体质量、性别和测量的各项参数值收集整理后进行统计分析. 结果 髋臼上方骨质形态在通过股骨头中心的冠状面上呈倒漏斗形,由远及近逐渐变薄,断面呈扇形,角度逐渐增大,半径逐渐变短.两性均在髋臼上方3 cm明显变薄,平均厚度男性为3.00 cm,女性为2.85 cm.男女两性之间的骨盆高度、骨盆宽度、颈干角、股骨头直径以及髋臼上方2 cm平面的骨质厚度等参数差异有统计学意义(P＜0.05),特别是颈干角,男性平均为121.42°,女性平均为135.42°,相差达14°,男女两性最小值与最大值相差达24.1°. 结论 髋臼上方骨质允许在全髋关节翻修术时垂直上方或上内方3 cm内放置高位髋中心.正常国人髋关节周围骨性参数男女差别较大,基于性别的差异,有必要在建立数据库时进行区别.     

The use of a high-hip center in revision total hip arthroplasty

In certain cases, primary and revision total hip arthroplasty is complicated by insufficient bone stock and distorted acetabular anatomy such that the craniocaudal dimension of the acetabular recess is greater than the anteroposterior dimension. Acetabular reconstruction in such cases can be carried out by placing the acetabular component more proximally than normal (high-hip center). Recent biomechanical and clinical data suggest that placement of the acetabular component at a higher than normal hip center does not adversely effect the longevity of the component fixation. Proximal placement of the hip center also facilitates the contact between the host bone and the porous coating when uncemented porous coated components are used, and minimizes the need for structural bone grafts. However, femoral components with longer neck lengths and removal of impinging bone are needed when the acetabular components are placed more proximally in order to restore the limb lengths and minimize the chances for dislocation.     

Determination of the rotational center of the hip

We introduce a new method to determine the anatomic rotation center of the hip. In total, 214 healthy hip joints were examined and statistically analyzed. As a reference point we used the intersection between Koehler’s line and a line between the upper rims of the two foramina obturatoria. In relation to the reference point the anatomic hip center is localized 7.7% in vertical direction and 17.4% in horizontal direction for male individuals and 7.75 and 15.4% for female individuals, respectively. Those data were referred to the pelvic height. Our data can be used to determine the anatomic hip center in an easy and reliable way, not only for preoperative planning but also for retrospective investigations.     

人工髋关节翻修旋转中心重建的临床研究

目的 探讨在人工髋关节翻修手术中,根据Harris窝及髋臼切迹的残存解剖标记,定位髋臼中心点,正确安装髋臼假体和重建髋关节旋转中心的可行性.方法 2007年4月至2009年6月,行28例髋关节翻修术.依据Paprosky分型:Ⅰ型3例,采用生物固定型髋臼假体;ⅡA和ⅡB型8例,采用打压颗粒骨植骨和大直径骨水泥型髋臼假体固定;ⅡC、ⅢA和ⅢB型17例,采用打压颗粒骨植骨和髋臼加强杯固定,其中5例有髋臼内壁穿透者采用结构性和颗粒性植骨.手术中在髋臼切迹连线的垂直平分线上方25～28mm、Harris窝窝内头侧接近原月状软骨面处,定位为原髋臼中心点,以该点为同心圆的圆心安装髋臼杯假体(Ⅰ型)或打压植骨造臼,按照俯倾角40°～45°、前倾角15°～20°安放髋臼加强杯(Ⅱ、Ⅲ型).手术前后摄双侧髋关节正位X线片,测量髋关节旋转中心至两侧泪滴连线的垂直距离和至泪滴的水平距离.分别与术前和健侧比较,评价髋关节旋转中心的重建效果.结果 髋关节旋转中心至两侧泪滴连线的垂直距离:术前为(32.64±4.51)mm,术后为(14.22±3.39)mm,差异有统计学意义(t=3.65,P＜0.05).髋关节旋转中心至泪滴的水平距离:术前为(25.13±3.46)mm,术后为(32.87±4.73)mm,差异有统计学意义(t=2.72,P＜0.05).结论 在髋关节翻修手术中,以残存的Harris窝和髋臼切迹为解剖标记,定位髋臼中心点,能够较准确地安装髋臼假体和有效重建髋关节旋转中心.

Abstract：

Objective To discuss the feasibility of positioning the acetabular center,fixing acetabular implant correctly and reconstructing hip rotation center according to Harris fossa and the remaining anatomical markers of acetabular notch in revision hip arthroplasty.Methods Twenty-eight patients underwent revision hip arthroplasty from April 2007 to June 2009.Based on Paprosky type,3 cases with type Ⅰ were treated with biological fixed acetabular component;8 cases with ⅡA and ⅡB were reconstructed with using of morselized bone grafting and large diameter cemented acetabular prosthesis;17 cases with type ⅡC,ⅢA and ⅢB were treated with using of morselized bone grafting and fixation of acetabular reinforcement ring.Among them,5 patients with massive bone loss in acetabular wall were reconstructed with the use of the structural and morselized bone grafting.The center of the original acetabulum was believed to be in the lunate cartilage surface which was closed to Harris fossa.During the operation,the center was located in the site which was 25-28 mm above in line with perpendicular bisector of acetabular notch connecting line.The acetabular center was the point of positioning acetabular prosthesis (Ⅰ type) or making new acetabulum by impaction bone grafting.Acetabular reinforcement ring (Ⅱ,Ⅲ type) was fixed in accordance with proper transverse angle and anteversion angle.The vertical distance from hip rotation center to teardrop connection and the horizontal distance from hip rotation center to teardrop were measured on preoperative and postoperative radiograph.And the outcomes of reconstruction of rotation center were evaluated.Results The vertical distance was changed from (14.22±3.39) mm preoperatively to (32.64±4.51) mm postoperatively.The difference was statistically significant (t=3.65,P＜ 0.05).The horizontal distance was changed from (25.13±3.46)mm preoperatively to (32.87±4.73) mm postoperatively.The difference was statistically significant (t=2.72,P＜0.05).Conclusion Using residual Harris fossa and acetabular notch as the anatomical markers in revision hip arthroplasty,the restoration of the anatomical hip center has shown to be favorable.     

Evaluation of the hip center in total hip arthroplasty for old developmental dysplasia

We describe the problems with positioning the hip center according to the severity of dislocation in 97 cementless total hip arthroplasty for developmental dysplasia of the hip. The mean location of the hip center from the interteardrop was 30.4 +/- 8.7 mm horizontally and 23.4 +/- 5.4 mm vertically. The presence of a limp correlated with a superior placement of the cup. Four cups were revised, 2 of which with a significant high hip center. The survival rate of the acetabular component was 95% at 12 years. Craniopodal repositioning was easy in class 1. In class 2, the cup was the largest. In class 3, the greatest variations of the hip center were found. In class 4, the smallest implants were necessary for positioning in the true acetabulum.     

3D打印髋关节旋转中心定位器在全髋关节置换术中的辅助作用

目的探讨3D打印髋关节旋转中心定位器在全髋关节置换术中的辅助作用。方法回顾性分析2015年8月至2017年12月期间郑州市骨科医院关节Ⅰ科采用单侧人工全髋关节置换术治疗的14例股骨头缺血性坏死或股骨颈骨折患者资料。男8例,女6例;年龄为37~65岁,平均51.8岁。运用3D打印髋关节旋转中心定位器辅助进行全髋关节置换术。术后测量臼杯的外展角、前倾角及髋关节旋转中心,记录患者手术后髋关节旋转中心O2(患侧)与解剖旋转中心O1(健侧)的符合情况、末次随访时髋关节功能及并发症发生情况。结果14例患者术后获6~24个月(平均18个月)随访。髋关节旋转中心O2与解剖旋转中心O1的纵坐标分别为(19.36±3.61)、(18.33±3.41)mm,横坐标分别为(39.93±2.97)、(39.99±3.16)mm,差异均无统计学意义(P>0.05),旋转中心符合。术后患侧外展角与髋臼前倾角均在正常范围内:外展39.3°±3.2°,前倾14.6°±1.2°。末次随访时14例患者的髋关节Harris评分由术前(42.3±3.2)分提高至(94.3±4.7)分,差异有统计学意义(t=2.873,P=0.002);优13例,良1例。随访期间X线片示假体位置良好,无髋臼及股骨假体松动,未见异位骨化形成。结论3D打印髋关节旋转中心定位器应用于人工全髋关节置换术,可有效协助髋关节旋转中心的重建,精准植入髋臼假体。     

Total hip arthroplasty in developmental high dislocation of the hip

In total hip arthroplasty for developmental high dislocations, placement of the implant cup in the true acetabulum and femoral-shortening osteotomy can produce satisfactory results. We performed total hip arthroplasties in 25 high dislocated hips (22 patients) between 1992 and 2000, placing all cups in the true acetabula and using noncemented components and performing a femoral-shortening osteotomy in 22 hips. The overall complication rate was 36%. At follow-up evaluation at an average of 5 years later, patients' mean scores had improved as follows: pain, from 2.3 to 5.7; function scores, from 2.3 to 4.5; mobility scores, from 2.3 to 4.4; Harris hip scores, from 37.8 to 95. We recommend both placing the cup in the true acetabulum to maximize host-bone contact with the implant and preserve as much host bone as possible and femoral-shortening osteotomy for a lower incidence of nerve injury than with aggressive soft-tissue release.     

The relationship between hip joint space width, center edge angle and acetabular depth

OBJECTIVE: Radiographic parameters used to define acetabular dysplasia may be related to anthropological characteristics independent of dysplasia. The goal of the present study was to investigate the relationship between the minimal joint space width (JSW) of the hip and the parameters that define acetabular dysplasia, in clinically normal subjects. DESIGN: One hundred and eighteen patients who underwent supine abdominal radiography for non-rheumatological indications and had no hip pain or history of hip arthritis were evaluated. JSW was quantified manually using dial calipers, and center edge (CE) angle and acetabular depth were measured for each hip. RESULTS: CE angle, but not acetabular depth, correlated (inversely) with the minimal hip JSW (r=-0.26 and -0.20, P=0.005 and 0.038, R (right) and L (left) hips, respectively). CE angle inversely correlated with the pelvic width (r=-0.27 and 0.27, P=0.003 and 0.004, R and L hips, respectively) and acetabular depth correlated with subject's height (r=0.27 and 0.42, P=0.008 and <0.001 R and L hips, respectively) and leg length (r=0.27 and 0.45, P=0.008 and <0.001, R and L hips, respectively). Also, pelvic width correlated significantly with the JSW (r=0.27 and 0.20, P=0.003 and 0.033, for R and L hips, respectively). CONCLUSIONS: The radiographic parameters used to define acetabular dysplasia, CE angle and acetabular depth, are strongly associated with anthropological variables and CE angle is associated with minimal JSW of the hip. It is important to recognize that height and limb length variability may affect radiographic parameters of acetabular dysplasia, and thus may falsely suggest the presence of anatomic abnormalities in some patients.     

Effect of superior placement of the hip center on abductor muscle strength in total hip arthroplasty

We evaluated 100 limbs in 50 patients who had undergone unilateral primary total hip arthroplasty with a normal contralateral hip. The 50 patients were divided into 2 groups by postoperative acetabular cup position, specifically by inferior and superior placement (inferior and superior groups). Hip abductor muscle strength was evaluated qualitatively by the modified Trendelenburg test and quantitatively by handheld dynamometer. The ratio of normalized strength of the reconstruction side to that of the nonoperated side was calculated (strength ratio). The modified Trendelenburg test was positive in 5 of 23 patients in the inferior group and 11 of 27 in the superior group (P < .05). The strength ratio of the superior group was decreased by 7.7% in comparison with that of the inferior group (P < .01).     

Calculating the hip center of rotation using contralateral pelvic anatomy

Failure to place an artificial hip in the optimal center of rotation results in poor hip function and costly complications. The aim of this study was to develop robust methodology to estimate hip center of rotation (hCoR) from preoperative computed tomography (CT) scans, using contralateral anatomy, in patients with unilateral diseased hips. Ten patients (five male, five female) with normal pelvic anatomy, and one patient with a unilateral dysplastic acetabulum were recruited from the London Implant Retrieval center image bank. 3D models of each pelvis were generated using commercial software. Two methods for estimation of hCoR were compared. Method 1 used a mirroring technique alone. Method 2 utilized mirroring and automatic alignment. Predicted versus actual hCoR co‐ordinates were compared using intraclass correlation coefficients and paired T‐tests. Both methods predicted hCoR with excellent agreement to original co‐ordinates (>0.9) in all axes. Both techniques allowed prediction of the hCoR within ± 5 mm in all axes. Both techniques provided useful clinical information for planning acetabular reconstruction in patients with unilateral defects. Method 1 was less complex and is suitable for patients with developmental and degenerative pathologies. Method 2 may provide greater accuracy in a discrete group of patients with normal development prior to pathology (e.g., acetabular fractures). © 2015 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 34:1077–1083, 2016.     

股骨偏心距和髋臼旋转中心对人工全髋置换术后关节功能影响的回顾性研究

[目的]通过股骨偏心距及髋臼旋转中心手术后测量,探讨其变化对人工全髋置换术后关节功能的影响。[方法]临床随访本院人工全髋置换术后患者87例(92髋),均为首次行全髋关节置换术患者,平均随访时间2年1个月,测量手术后双髋关节X线片,比较术后假体股骨偏心距、旋转中心与解剖股骨偏心距、旋转中心符合率,对患者术后髋关节功能进行Harris评分并分组进行统计学分析。[结果]股骨偏心距及髋臼旋转中心均恢复(A组)27例(29.35%),(B组)仅FO恢复23例(25.00%),(C组)仅HJC恢复31例(33.70%),(D组)FO及HJC均未恢复11例(11.96%),Harris评分优良率A组96.30%,B组为73.19%,C组为74.19%,D组为27.27%,Harris评分优良率A组与B组(P=0.039),A组与C组(P=0.029),A组与D组(P=0.000)差异均有统计学意义。[结论]股骨偏心距及旋转中心的恢复对人工全髋置换术后关节功能有直接影响。     

Biomechanical analysis of various operative hip joint rotation center shifts

Summary A mathematical model was used to evaluate the mechanical situation after various operative shifts of the hip joint rotation center. It was concluded that while performing different pelvic osteotomies and the total hip replacement the hip joint rotation center should be shifted as far medially as is technically possible to reduce the magnitude of the hip joint contact force. By contrast, lateralization of the hip joint rotation center strongly increases the magnitude of the hip joint contact force; therefore this should be avoided whenever possible. The superior shift of the hip joint rotation center decreases the strength of the patient's hip abductor muscles and must therefore also be avoided. The inferior shift of the hip joint rotation center is favorable because it increases the strength of the patient's hip abductor muscles.     

Cementless total hip arthroplasty in patients with high congenital hip dislocation

BACKGROUND: The optimal surgical treatment for patients with high congenital dislocation of the hip remains controversial. The purpose of our study was to evaluate the mid-term to long-term results of cementless total hip arthroplasty in such patients. METHODS: The study included sixty-eight total hip replacements performed between 1989 and 1994 in fifty-six consecutive patients with high congenital hip dislocation at our hospital. The cup was placed at the level of the true acetabulum, and a shortening osteotomy of the proximal part of the femur and distal advancement of the greater trochanter were performed in 90% of the hips. At the time of final follow-up, at a mean of 12.3 years postoperatively, fifty-two patients (sixty-four hips) were evaluated by us with a physical examination, determination of Harris hip scores, and radiographs. RESULTS: The mean Harris hip score increased from 54 points preoperatively to 84 points at the time of final follow-up (p < 0.001). There was a negative Trendelenburg sign in fifty-nine (92%) of the sixty-four hips. There were thirteen perioperative complications (19%): three peroneal nerve palsies, one femoral nerve palsy, one superior gluteal nerve palsy, four nondisplaced fractures of the proximal part of the femur, one malpositioned stem perforating the posteromedial cortex of the femur, one superficial wound infection, and two early dislocations. With revision because of aseptic loosening as the end point, the ten-year survival rate for press-fit, porous-coated acetabular components was 94.9% (95% confidence interval, 89.3% to 100%). Eight of nine threaded acetabular components were revised, and the ninth was radiographically loose at the time of the last follow-up examination. The rate of survival for the CDH femoral components, with revision because of aseptic loosening as the end point, was 98.4% (95% confidence interval, 96.8% to 100%) at ten years. CONCLUSIONS: Total hip arthroplasty, with placement of the cup at the level of the true acetabulum, distal advancement of the greater trochanter, and femoral shortening osteotomy, can be recommended for patients with high congenital hip dislocation. Complications such as wear, osteolysis, and cup revision were secondary to the suboptimal design of the acetabular components used in this series.     

Reconstruction of the rotation center of the hip after oblong cups in revision total hip arthroplasty

Background

The preoperative bone defect and the reconstruction of the center of rotation of the hip are critical in acetabular revision surgery. Uncemented oblong cups are employed in order to manage these issues. We analyzed the clinical results and rates of revision of two different uncemented oblong cups, the reconstruction of the center of rotation of the hip, as well as the rate of radiological loosening and possible risk factors.

Materials and methods

Forty-five patients (46 hips) underwent acetabular revision surgery using two different uncemented oblong cups. We assessed the clinical results and the survival rate for revision and aseptic loosening. Intraoperative bone loss was classified according to Paprosky, and acetabular reconstruction was assessed according to Ranawat. The mean follow-up was 7.2 years (range 4–11 years).

Results

There were four re-revisions (three due to aseptic loosening); the survival rate for re-revision due to aseptic loosening was 60.1 % at seven years. The mean distance between the center of the femoral head prosthesis and the approximate center of the femoral head improved from 21.5 to 10.2 mm. Thirteen cups showed radiological loosening; the survival rate for radiological loosening at seven years was 40.54 %. A smaller postoperative horizontal distance was correlated with cup loosening.

Conclusions

Although optimal acetabular reconstruction can be achieved by using oblong uncemented cups in revision hip surgery, the clinical and radiological results are not encouraging. Excessive medialization of the cup may increase the rate of loosening.     

有限高位髋关节旋转中心数学模型的推导

目的建立国人有限高位髋关节旋转中心的数学模型，进一步了解髋中心高位放置以后的生物力学变化，探寻降低髋关节应力的途径，并作出定量描述。方法在正常髋关节数学模型的基础上，将髋关节旋转中心H点上方向内、外各2cm，向上5cm的区域进行节点的划分。结果在髋中心垂直上移5cm以内（包括5cm），男女两性外展肌力和髋关节接触力的值都随髋中心的垂直上升而逐渐升高。在3cm以内髋中心升高的幅度远远小于3cm以上升高的幅度。髋中心升高同样的高度，对女性外展肌力和髋关节接触力的影响更大。髋中心以与垂线外展10&#176;的方向上移5cm以内（包括5cm），男女两性外展肌力和髋关节接触力的值都随髋中心向外上方向上升而逐渐升高。升高相同高度时，外上方向上升是垂直方向上升的两倍。男女两性保持髋关节接触力不变时髋中心向上内移动的轨迹，在纵向变化5cm的范围之内时，横向不超过1．6cm，在纵向变化3cm的范围之内时，横向不超过1．0cm。男女两性保持髋关节接触力不变，保持大转子的位置不变时，髋中心高度升高3cm，颈干角角度变化男性不超过17&#176;，女性不超过10&#176;；颈长变化男性不超过2．7cm，女性不超过2．9cm&#176;升高5cm时，颈干角角度变化男性不超过23&#176;，女性不超过14&#176;；颈长变化男性不超过4．6cm，女性不超过4．9cm。总的趋势是男性以角度变化为主，女性以颈长变化为主。保持外展肌力不变，髋中心垂直上移时，男女两性重心的摆动幅度逐渐增加。上升同样的高度女性摆动幅度大于男性。升高到3cm时，男性摇摆幅度大约7&#176;，女性大约9&#176;。结论本项研究所建立的国人有限高位髋中心数学模型，可以比较精确地模拟髋中心高位放置以后的生物力学变化。模拟显示髋中心上内放置，再通过增加颈长或改变颈干角以补偿外展肌的长度并保持偏心距，在升高不超过3cm的范围内，可以避免因外展肌力改变导致的髋臼接触力的升高。     

THA解剖重建髋臼旋转中心治疗成人DDH

[目的]探讨THA解剖重建髋臼旋转中心治疗成人发育性髋关节脱位的临床疗效。[方法]对2010年2月～2018年2月在本院行初次全髋关节置换的102例(118髋) DDH患者进行回顾性分析,其中男37例,女65例;年龄32～71岁,平均(66.35±4.65)岁。依据Crowe分型Ⅰ型60例(65髋),Ⅱ型28例(34髋),Ⅲ型9例(12髋),Ⅳ型5例(7髋)。记录比较各Crowe类型患者围手术期情况、随访和影像资料。[结果]在手术时间、切口大小、术中失血方面随Crowe分型等级增加而增加,Crowe I、Ⅱ型组间比较差异无统计学意义(P0.05),CroweⅢ、Ⅳ型组间比较差异无统计学意义(P0.05),但Crowe I、Ⅱ型与CroweⅢ、Ⅳ型组间比较差异有统计学意义(P0.05)。所有患者切口均一期愈合,无感染。CroweⅡ型组术后出现脱位1例,在全麻下一期行手法复位,余患者未出现脱位等早期并发症。118髋随访2～8年,平均(5.94±2.06)年,随访期间,所有患者未再发生髋关节脱位、骨折等并发症。与术前相比,末次随访各Crowe分型组的VAS评分均显著减少,双侧下肢长度差值均显著减少,Harris评分均显著增加(P0.05);术前和末次随访时, Harris评分依各Crowe分型等级增加而减少,总体差异均有统计学意义(P0.05)。至末次随访时,所有患者均无明显疼痛、Trendelenburg征均为阴性。无假体松动、断裂。[结论]成人DDH行初次全髋关节置换在解剖位重建髋关节旋转中心可获得满意临床疗效。