Primary rotational stability of cylindrical and conical revision hip stems as a function of femoral bone defects: an in vitro comparison

Bone stock losses in cementless femoral stem revisions compromise a stable fixation. The surgeon has to rely on his wealth of experience in deciding which stem shape to use. The aim of our study was to compare the primary rotational stability of cylindrical and conical revision hip stems subjected to femoral defects. Four current prostheses (two cylindrical, two conical) were implanted into four synthetic femora. Micro-motion was measured under torque application and femoral neck osteotomy and segmental AAOS Type I and III defects were simulated. The relative movements of all prostheses were significantly influenced by the extent of bone loss (p<0.01). Major differences were seen in fixation behavior (p<0.01). The main fixation area of conical stems is within the distal femoral isthmus, whereas cylindrical implants are dependent on proximal bone stock. In our study, cylindrical stems are advantageous for minor defects because they provide a proximal fixation. In cases of extensive substance loss, the conical implants showed lesser relative movements. These findings should be taken into account for clinical decisions.     

Analysis of the periprosthetic femoral bone reaction after uncemented total hip arthroplasty with computertomography assisted osteodensitometry in vivo: 6-year follow-up]

AIMS: We prospectively analyzed the cancellous and cortical periprosthetic femoral bone reaction after implantation of a cementless total hip arthroplasty with computertomography assisted osteodensitometry after a mean of 1 and 6 years. MATERIALS AND METHODS: Twenty-one patients (? age at implantation: 52 years) with osteoarthrits of the hip joint received 21 cementless hip prostheses with a three-dimensionally tapered design. All patients were analyzed clinically, with CT-osteodensitometry and plain radiography after a mean of 10 days, at 1 and 6 years postoperatively. Cancellous and cortical bone density was evaluated automatically using a special software tool. RESULTS: The proximal region of the stem showed progessive cortical (? -15% 1 year, -25% 6 years post-OP) and cancellous (? -26% 1 year, -49% 6 years post-OP) bone density loss. Cortical bone density loss was lower and non-progressive at the diaphysis (? -7% 1 year, -9% 6 years post-OP) and the distal region (? -6% 1 year, -4% 6 years post-OP) of the stem. All stems showed no signs of loosening on plain radiography and good clinical results according to the Harris hip score. CONCLUSION: Computertomography assisted osteodensitometry is the only method which allows discrimination between periprosthetic cortical and cancellous bone density changes in vivo. The analyzed uncemented stem fixates at the diaphysis and distal region. Due to the changed biomechanical loading after stem implantation, progressive proximal cancellous bone density loss was measured for the first time in vivo. Its role in the pathogenesis of implant loosening is still unknown and needs to be further elucidated.     

Improving stress shielding following total hip arthroplasty by using a femoral stem made of β type Ti-33.6Nb-4Sn with a Young’s modulus gradation

Stress shielding-related bone loss occurs after total hip arthroplasty because the stiffness of metallic implants differs from that of the host femur. Although reducing stem stiffness can ameliorate the bone resorption, it increases stress at the bone–implant interface and can inhibit fixation. To overcome this complication, a novel cementless stem with a gradient in Young’s modulus was developed using Ti-33.6Nb-4Sn (TNS) alloy. Local heat treatment applied at the neck region for increasing its strength resulted in a gradual decrease in Young’s modulus from the proximal to the distal end, from 82.1 to 51.0 GPa as calculated by a heat transfer simulation. The Young’s modulus gradient did not induce the excessive interface stress which may cause the surface debonding. The main purpose of this study was to evaluate bone remodeling with the TNS stem using a strain-adaptive bone remodeling simulation based on finite element analysis. Our predictions showed that, for the TNS stem, bone reduction in the calcar region (Gruen zone 7) would be 13.6% at 2 years, 29.0% at 5 years, and 45.8% at 10 years postoperatively. At 10 years, the bone mineral density for the TNS stem would be 42.6% higher than that for the similar Ti-6Al-4V alloy stem. The stress–strength ratio would be lower for the TNS stem than for the Ti-6Al-4V stem. These results suggest that although proximal bone loss cannot be eliminated completely, the TNS stem with a Young’s modulus gradient may have bone-preserving effects and sufficient stem strength, without the excessive interface stress.     

The modular hip revision stem made of titanium alloy--influence and optimisation of bending stiffness]

The MRP-Titan Revision stem has proved to be a highly successful implant system for revision arthroplasty of the hip. Good and excellent clinical and radiological results with spontaneous filling of bony defects have been reported, The observation of atrophy of the proximal femur associated with stem diameters > 17mm prompted us to examine the bending stiffness of stems of various diameters. To determine their static bending characteristics, the stems were tested under axial pressure loads in accordance with Euler's buckling case. Dynamic tests were performed with the mono-axial servohydraulic test equipment MTS 810. From a stem diameter of 18 mm upwards, deflection of the stem under loading decreased disproportionately, in direct correlation with the stem stiffness. By optimising the geometry and varying the alloy it is possible to obtain a constant ISD factor for the modular MRP-Titan revision stem CONCLUSION: The MRP-Titan revision stem is a reliable implant system for revision arthroplasty of the hip. Clinical findings of atrophy of the proximal femur associated with stem diameters > 17 mm was found to be correlated with a disproportionate increase in bending stiffness. The aim of further developments will be to reduce the stiffness of larger-diameter stems by making changes to the design and/or to the alloy (Ti15Mo, Ti13Nb13Zr, Ti12Mo6Zr2Fe2).     

Primary Rotational Stability of Various Megaprostheses in a Biomechanical Sawbone Model with Proximal Femoral Defects Extending to the Isthmus

Purpose

Fixation of proximal femoral megaprostheses is achieved in the diaphyseal isthmus. We hypothesized that after extended bone resection including the proximal part of the isthmus a reduced length of fixation will affect the stability and fixation characteristics of these megaprostheses. The aim of this study was to analyze in a validated sawbone model with extended proximal femoral defects which types of implants have sufficient primary stability to allow osteointegration and to describe their fixation characteristics.

Methods

Four different cementless megaprostheses were implanted into 16 Sawbones with an AAOS type III defect after resection 11cm below the lesser trochanter involving the proximal isthmus. To determine the primary implant stability relative micromotions between bone and implant were measured in relation to a cyclic torque of 7Nm applied on the longitudinal axis of the implant. We determined the fixation characteristics of the different implant designs by comparing these relative micromotions along the longitudinal stem axis.

Results

In the tested sawbones all studied implants showed sufficient primary stability to admit bone integration with relative micromotions below 150µm after adapting our results to physiologic hip joint loadings. Different fixation characteristics of the megaprostheses were determined, which could be explained by their differing design and fixation concepts.

Conclusions

Cementless megaprostheses of different designs seem to provide sufficient primary stability to bridge proximal femoral defects if the diaphyseal isthmus is partially preserved. In our sawbone model the different implant fixation patterns can be related to their stem designs. No evidence can be provided to favor one of the studied implants in this setting. However, femoral morphology is variable and in different isthmus configurations specific implant designs might be appropriate to achieve the most favorable primary stability, which enables bone integration and consequently long term implant stability.     

动力髋螺钉与股骨近端髓内钉治疗老年股骨近端骨折的临床疗效比较

目的:比较动力髋螺钉与股骨近端髓内钉治疗老年股骨近端骨折的临床疗效和安全性。方法:收集我院收治的老年股骨近端骨折患者64例,随机分为DHS组和PFN组,每组各32例。DHS组患者给予动力髋螺钉的固定方式,PFN组给予股骨近端髓内钉的固定方式。手术后对患者的手术切口长度、术中出血量、手术时间、骨折愈合时间、术后并发症以及患者临床疗效进行检测并比较。结果:与治疗前相比,两组患者治疗后的Harris评分均显著下降(P0.05);与DHS组相比,PFN组患者的手术切口长度、术中出血量、手术时间、骨折愈合时间、术后并发症的发生率以及Harris评分均较低(P0.05)。结论:股骨近端髓内钉的固定治疗老年股骨近端骨折的临床疗效较好,安全性更高。     

The influence of tibial component fixation techniques on resorption of supporting bone stock after total knee replacement

Periprosthetic bone resorption after tibial prosthesis implantation remains a concern for long-term fixation performance. The fixation techniques may inherently aggravate the "stress-shielding" effect of the implant, leading to weakened bone foundation. In this study, two cemented tibial fixation cases (fully cemented and hybrid cementing with cement applied under the tibial tray leaving the stem uncemented) and three cementless cases relying on bony ingrowth (no, partial and fully ingrown) were modelled using the finite element method with a strain-adaptive remodelling theory incorporated to predict the change in the bone apparent density after prosthesis implantation. When the models were loaded with physiological knee joint loads, the predicted patterns of bone resorption correlated well with reported densitometry results. The modelling results showed that the firm anchorage fixation formed between the prosthesis and the bone for the fully cemented and fully ingrown cases greatly increased the amount of proximal bone resorption. Bone resorption in tibial fixations with a less secure anchorage (hybrid cementing, partial and no ingrowth) occurred at almost half the rate of the changes around the fixations with a firm anchorage. The results suggested that the hybrid cementing fixation or the cementless fixation with partial bony ingrowth (into the porous-coated prosthesis surface) is preferred for preserving proximal tibial bone stock, which should help to maintain post-operative fixation stability. Specifically, the hybrid cementing fixation induced the least amount of bone resorption.     

Loosening of cementless femoral stems: a biomechanical analysis of immediate fixation with loading vertical, femur horizontal

Large joint implants must have immediate fixation to be successful. Unfortunately, the magnitude and consistency of achieving this remains largely unknown. For cementless femoral components it is being increasingly appreciated that torsional loading as occurs during stair climbing or rising from a chair leads to loosening and thigh pain in some cases. A biomechanical test was developed to evaluate fixation in this position. Twelve pairs of human cadaveric femora were press-fit with an AML stem. Each femur was secured in a horizontal position, and the prosthetic head cyclically loaded in a vertically downward direction. The offset of the prosthetic head resulted in a combined torsional and compressive load being applied to the stem within the proximal femur. Loosening was found to consistently occur and rapidly accelerate when the head subsided more than 0.2 mm during 100 cycles. For the AML stem, loosening developed at loads from 62 to 171% of body weight and after as few as 800 cycles. This is within the physiologic range of normal daily activities as measured by others with instrumented prostheses. This poses a challenge to the ability of press-fit stems to tolerate torsional loads in vivo. Patients with a cementless prosthesis should be protected from torsional loading until porous ingrowth and/or bone remodelling have had time to occur. Testing the same stem in paired femora demonstrated no right vs left difference (p greater than 0.6).     

Finite-element modelling of femoral shaft fracture fixation techniques post total hip arthroplasty.

The presence of a femoral prosthesis superior to a shaft fracture severely complicates fixation and treatment. This study uses two-dimensional, multithickness, plane stress finite-element models of a femur with prosthesis to investigate the stresses developed with the application of three popular fixation techniques: revision to a long stem prosthesis, lateral plating with a cortical bone allograft strut and cerclage wires, and custom plate application with proximal Parham band fixation with distal cortical screws (Ogden plate). The plate and bone contact as well as the fracture site contact were modelled by using orthotropic elements with custom-fit moduli so that only the normal stress to the interface was significant. A thermal analogy was used to model the cerclage and Parham band preloads so that representative preloads in the proximal fixation of the two types of plate treatments could be modelled. A parametric study was performed with the long-prosthesis model to show variations in stem lengths of one, two and three femoral diameters distal to the fracture site. The Ogden plate model showed a transfer of tensile stress near the proximal-most band, with the highest tensile stress being at the fracture site with evidence of stress shielding of the proximal lateral cortex. The cortical bone strut model showed a transfer of tensile stress to the bone strut but showed less shielding of the proximal cortex. The cerclage wires at the base of the bone strut showed the highest changes in load with the distalmost wire increasing to almost four times its original preload.(ABSTRACT TRUNCATED AT 250 WORDS)     

Design optimization of a prosthesis stem reinforcing shell in total hip arthroplasty

The use of a perforated, titanium funicular shell to support the proximal femoral cortex in total hip arthroplasty was evaluated with the aid of both analytical and numerical techniques. The principal interactions between the femoral cortex, the metal shell, the implant stem and the acrylic bone cement were modeled using beam on elastic foundations theory and two-dimensional elasticity theory. Subsequent formulation of this model as a nonlinear design optimization problem enabled the determination of the dimensions of the implant and reinforcing shell which minimized an objective function based on a simplified material failure criterion. Two cases were examined, each with two cervico-diaphyseal angles: case A: with a rigid contact between a proximal prosthesis collar and the calcar femorale and case B: no collar contact (a collarless prosthesis or post-operative loosening). Case A achieved an optimal solution at a stem diameter 11-23 percent of the cortex inner diameter, a stem length to diameter ratio of 12-40, shell diameter 22-53 percent and thickness 0.2-7.2 percent of the cortex inner diameter and thickness, respectively. Case B achieved an optimal solution at a stem diameter 67-92 percent of the cortex inner diameter, length to diameter ratio of 4-6, and no shell. In case A the collar support makes the type of internal fixation unimportant, while in the more realistic case B, the shell is not recommended.     

Predicting the subject-specific primary stability of cementless implants during pre-operative planning: preliminary validation of subject-specific finite-element models

Pre-operative planning help the surgeon in taking the proper clinical decision. The ultimate goal of this work is to develop numerical models that allow the surgeon to estimate the primary stability during the pre-operative planning session. The present study was aimed to validate finite-element (FE) models accounting for patient and prosthetic size and position as planned by the surgeon. For this purpose, the FE model of a cadaveric femur was generated starting from the CT scan and the anatomical position of a cementless stem derived by a skilled surgeon using a pre-operative CT-based planning simulation software. In-vitro experimental measurements were used as benchmark problem to validate the bone-implant relative micromotions predicted by the patient-specific FE model. A maximum torque in internal rotation of 11.4 Nm was applied to the proximal part of the hip stem. The error on the maximum predicted micromotion was 12% of the peak micromotion measured experimentally. The average error over the entire range of applied torques was only 7% of peak measurement. Hence, the present study confirms that it is possible to accurately predict the level of primary stability achieved for cementless stems using numerical models that account for patient specificity and surgical variability.     

病灶清除植骨联合DHS内固定治疗股骨近端囊肿

目的:探讨病灶清除植骨联合动力髋螺钉(DHS)内固定术治疗股骨近端囊肿的临床疗效及意义。方法:自2006年3月至2012年6月共有17例股骨近端囊肿患者在我院接受治疗并有完整随访,全部患者均应用病灶清除植骨联合DHS内固定术手术治疗。结果:平均随访时间18个月(14-60个月),病灶植骨处平均愈合时间7个月(6-8个月)。平均手术时间182分钟(90分钟~282分钟),术中平均出血量340 mL(100~700 mL)。切口全部一期愈合,术后病灶处均达到骨性愈合,骨密度均匀,17例均未出现骨囊肿复发及内固定断裂,未发生股骨头坏死及股骨近端骨折,按Harris髋关节功能评分标准,优良率为100%。结论:病灶清除植骨术联合DHS内固定治疗股骨近端囊肿操作简单,术中出血少,并发症少,疗效确切,是治疗股骨近端骨囊肿,降低其复发率和预防病理性骨折的一种有效方法。     

近端膨胀髓内钉与抗旋髓内钉治疗老年股骨转子间骨折的临床疗效分析

目的:探究近端膨胀髓内钉与近端螺旋刀片抗旋髓内钉治疗老年股骨转子间骨折疗效及躁动发生率比较。方法:病例来源为2012年5月至2013年10月收入我院的老年股骨转子间骨折患者60例,采用随机数字表随机分为两组,膨胀钉组30例,采用近端膨胀髓内钉的手术方法,PFNA组30例,采用近端螺旋刀片抗旋髓内钉的手术方法。手术结束后,对两组患者进行X射线片、手术时间及出血量、髋关节功能的比较,同时对比躁动发生率。结果:X线检查结果显示两组患者经手术后骨折处均复位良好,无并发症及内固定物的脱落及松动,两组比较无显著差异(P0.05);与PFNA组相比,膨胀组患者的手术时间及出血量明显降低,差异具有统计学意义(P0.05);两组患者术后3个月、6个月的Harris评分显示,与PFNA组相比,膨胀钉组的优良率明显升高,髋关节优于PFNA组,差异具有统计学意义(P0.05);膨胀钉组患者躁动率为10.00%低于PFNA组患者躁动率为33.33%,具有统计学意义(P0.05)。结论:可膨胀髓内钉具有手术时间较短、出血量少,更利于骨折的愈合,且躁动发生率较低,对股骨转子间骨折的疗效优于较近端螺旋刀片抗旋髓内钉,对临床有指导意义,值得临床推广。     

动力加压髋螺钉对股骨上段生物力学特征性的影响

目的：探讨股骨上端骨折,以动力加压髋螺钉进行骨固定治疗,骨折愈合后,取出动力加压髋螺钉以后的股骨上段与完整的股骨上段的生物力学特性相比较,为临床内固定取出术后功能锻炼的强度提供量化依据。方法：收集8具新鲜尸体股骨标本进行实验应力分析,分别测定完整股骨上段和动力加压髋螺钉取出后股骨上段的力学特性改变。结果：动力加压髋螺钉取出术后股骨上段的力学特性与完整股骨上段的力学特性相比有显著的差异（P＜0．01）。结论：股骨上端骨折如果以动力加压髋螺钉为治疗手段,在骨折愈合取出内固定后,功能锻炼只能控制在慢速步行水平,不能进行奔跑、跳跃等活动,以防止再骨折等并发症的发生。     

Implant Optimisation for Primary Hip Replacement in Patients over 60 Years with Osteoarthritis: A Cohort Study of Clinical Outcomes and Implant Costs Using Data from England and Wales

Background

Hip replacement is one of the most commonly performed surgical procedures worldwide; hundreds of implant configurations provide options for femoral head size, joint surface material and fixation method with dramatically varying costs. Robust comparative evidence to inform the choice of implant is needed. This retrospective cohort study uses linked national databases from England and Wales to determine the optimal type of replacement for patients over 60 years undergoing hip replacement for osteoarthritis.

Methods and Findings

Implants included were the commonest brand from each of the four types of replacement (cemented, cementless, hybrid and resurfacing); the reference prosthesis was the cemented hip procedure. Patient reported outcome scores (PROMs), costs and risk of repeat (revision) surgery were examined. Multivariable analyses included analysis of covariance to assess improvement in PROMs (Oxford hip score, OHS, and EQ5D index) (9159 linked episodes) and competing risks modelling of implant survival (79,775 procedures). Cost of implants and ancillary equipment were obtained from National Health Service procurement data.

Results

EQ5D score improvements (at 6 months) were similar for all hip replacement types. In females, revision risk was significantly higher in cementless hip prostheses (hazard ratio, HR = 2.22, p<0.001), when compared to the reference hip. Although improvement in OHS was statistically higher (22.1 versus 20.5, p<0.001) for cementless implants, this small difference is unlikely to be clinically important. In males, revision risk was significantly higher in cementless (HR = 1.95, p = 0.003) and resurfacing implants, HR = 3.46, p<0.001), with no differences in OHS. Material costs were lowest with the reference implant (cemented, range £1103 to £1524) and highest with cementless implants (£1928 to £4285).Limitations include the design of the study, which is intrinsically vulnerable to omitted variables, a paucity of long-term implant survival data (reflecting the duration of data collection), the possibility of revision under-reporting, response bias within PROMs data, and issues associated with current outcome scoring systems, which may not accurately reflect level of improvement in some patients.

Conclusions

Cement fixation, using a polyethylene cup and a standard sized head offers good outcomes, with the lowest risks and at the lowest costs. The most commonly used cementless and resurfacing implants were associated with higher risk of revision and were more costly, while perceptions of improved function and longevity were unsupported.     

超声剪切波弹性成像联合血清脂联素、尿激酶型纤溶酶原激活物对甲状腺结节良恶性的鉴别价值

摘要 目的：探讨超声剪切波弹性成像（SWE）联合血清脂联素（AFN）、尿激酶型纤溶酶原激活物（uPA）鉴别甲状腺结节良恶性的价值。方法：选择2020年1月至2022年12月我院收治的行甲状腺外科切除手术治疗的127例甲状腺结节患者,所有患者术前接受SWE检查,检测血清AFN、uPA水平,记录术后病理结果,并根据术后病理结果将患者分为恶性组和良性组。分析SWE参数联合血清AFN、uPA鉴别甲状腺结节良恶性的价值。结果：经术后病理检查证实,恶性结节21例（恶性组）,良性结节106例（良性组）。恶性组弹性模量最大值（Max）、弹性模量最小值（Min）、弹性模量平均值（Mean）,血清uPA水平高于良性组（P＜0.05）,血清AFN水平低于良性组（P＜0.05）。Max、Mean、Min、AFN、uPA鉴别甲状腺结节良恶性的曲线下面积分别为0.609、0.754、0.600、0.777、0.701,联合Max、Mean、Min、AFN、uPA鉴别甲状腺结节良恶性的曲线下面积为0.935,高于各指标单独鉴别。结论：恶性甲状腺结节患者SWE参数Max、Mean、Min和血清uPA水平增加,AFN水平降低,联合SWE参数和血清AFN、uPA可提高对甲状腺结节性质的鉴别效能。     

股骨近端抗旋髓内钉法治疗老年股骨转子下粉碎性骨折的效果分析

目的:探讨利用股骨近端抗旋髓内钉法治疗老年股骨转子下粉碎性骨折的临床效果,为临床提供参考。方法:对我院2009年6月-2013年1月收治的38例老年股骨转子下粉碎性骨折患者行股骨近端抗旋髓内钉法进行手术治疗,分析手术方法、效果及患者的预后效果。结果:28例行闭合复位,7例行骨折端切开复位,患者术后7-14d可下地活动,3 m内扶拐部分负重行走,31例(88.6%)获得随访,随访时间9-24个月,骨折愈合时间为3-6个月,平均3.7个月;Harris髋功能评分标准:优18例,良10例,中3例,优良率90.32%(28/31)。结论:PFNA是一种治疗老年股骨转子下粉碎性骨折的有效装置,能够减少骨折不愈合、髋内翻畸形愈合及内固定断裂、切割股骨头等并发症,在治疗老年股骨转子下粉碎性骨折时可达到较高的骨愈合率、较快的功能恢复。     

半髋关节置换治疗高龄老年人不稳定转子间骨折的效果研究

目的:探讨半髋关节置换术治疗老年不稳定性转子间骨折的治疗效果。方法:选择我院骨科2013年1月至2015年2月入院的老年不稳定转子间骨折患者64例,随机分为半髋关节置换组和髓内钉固定组,对两组手术时间、术中出血量、术后并发症、术后髋关节功能恢复状况进行评价。结果:半髋关节置换组手术时间较髓内钉固定组短(P0.05),半髋关节置换组和髓内钉固定组术中出血量、手术后并发症、髋关节功能恢复状况的差异不具有统计学意义(P0.05)。结论:半髋关节置换术治疗老年不稳定性转子间骨折具有较好的临床效果。     

近端防旋髓内钉与近端锁定钢板治疗老年股骨转子间不稳定骨折的疗效对比分析

目的:分析对比股骨近端防旋髓内钉(PFNA)与股骨近端锁定钢板(PFLP)治疗老年股骨转子间不稳定骨折的临床疗效。方法:回顾性分析我院骨外科2009年4月至2013年4月收治的老年股骨转子间不稳定骨折患者90例,根据患者手术方式的不同,将其分为PFNA组及PFLP组,各45例。对比分析两组患者术中出血量、手术持续时间及骨折愈合时间术后髋关节功能及内固定并发症情况。结果:PFNA组髋关节功能Harris评分优良率91.11%明显高于PFLP组的71.11%(P0.05);PFNA组比PFLP组骨折愈合时间短、内固定并发症少,比较差异有统计学意义(P0.05)。结论:应用PFNA治疗老年股骨转子间不稳定骨折患者具有骨折愈合时间短、髋关节功能恢复好、术后内固定并发症少的特点,治疗效果较PFLP更满意。     

重组合异种骨治疗股骨非感染性骨不连的长期疗效观察

目的:探讨重组合异种骨治疗股骨非感染性骨不连的长期临床疗效。方法:对2000年1月至2006年9月间我院应用重组合异种骨(RBX)治疗的37例股骨非感染性骨不连患者进行回顾性分析,其中男26例,女11例;年龄4～70岁,平均31.6岁。骨折部位:股骨近端4例,中段30例,远端3例。骨不连类型:肥大型9例,营养不良型6例,萎缩型22例。固定方式:加压钢板24例,髓内钉11例,外固定架2例。结果:37例患者获得51-131个月的随访,平均90.2个月,骨不连一次手术愈合率:94.6%,4例股骨近端骨不连患者采用Harris评分系统评定疗效,优3例,良1例,差0例,优良率100%。3例股骨远端骨不连患者采用美国膝关节协会评分系统(KSS)评定疗效,优1例,例良1例,差1例,优良率66.7%。30例股骨干骨不连患者采用Harris评分系统和KSS评定疗效,优21例,良8例,差1例,优良率96.7。总优良率94.6%。长期观察均无免疫排斥反应表现。结论:RBX用于治疗股骨非感染性骨不连具有材料充足、骨折愈合率高、组织兼容性好长期应用无免疫排斥反应等优点,是一种良好的自体骨替代材料。