股骨颈骨折的内固定治疗进展

自1931年Smith-Petersen首先报告三翼钉治疗股骨颈骨折以来,用于该骨折的内固定已超过100种,其中滑动加压系统如多枚平行螺钉应用最为广泛[1].f近期研究显示:滑动加压所导致的股骨颈短缩愈合可对患肢功能造成较大影响,从而表明最佳的内固定方式仍存在争议.本文就目前股骨颈骨折内固定的研究进展做一综述.     

股骨颈骨折的内固定手术治疗

对于嵌插型股骨颈骨折应该同移位型股骨颈骨折一样考虑行手术治疗。移位型股骨颈骨折,若病人无手术禁忌证均应采取手术治疗,目前多数作者主张应予以急诊手术。移位型股骨颈骨折的治疗原则包括解剖复位、骨折端加压、稳定的内固定。应尽可能采取闭合复位,只有在闭合复位失败、无法达到解剖复位时才考虑切开复位。目前常用的内固定材料可分为多针、螺钉、钩钉、滑动螺钉加侧方钢板等,各有其优缺点及适应证。年青人股骨颈骨折的治疗原则,一是急诊手术(伤后12h之内);二是一定要解剖复位,必要时切开复位;三是多枚螺钉坚强固定;有作者补充提出前关节囊切开减压的必要。     

人工关节置换治疗股骨颈骨折内固定失败的疗效观察

目的:观察人工髋关节置换治疗股骨颈骨折内固定失败患者的临床疗效.方法:自2007年6月至2014年1月采用人工髋关节置换治疗29例股骨颈骨折内固定失败的患者,其中男12例,女17例;年龄43~83岁,平均60.3岁;左髋16例,右髋13例.内固定距关节置换时间3~48个月,平均23.3个月.结果:29例患者中,直接生物杯固定20例,植骨修复缺损后生物杯固定7例,植骨修复缺损钛网杯固定后骨水泥臼杯固定2例;股骨柄生物型柄13例,骨水泥柄16例.无术中并发症发生,手术时间(115±38) min,术中出血量(420±175) ml,术后引流量(240±119) ml,术中输血量(200±220) ml,术中补液量(2 200±400) ml,术后输血量(300±200)ml,术后早期脱位1例.术后随访时间5~24个月,平均14.7个月,均愈合良好,未发生假体下沉、松动、脱位等现象.Harris评分由术前的51.1±7.5提高到末次随访88.5±6.4.结论:人工关节置换治疗股骨颈骨折内固定失败患者,可早期下地功能锻炼,减少卧床时间及并发症的发生,有利于早期功能恢复,远期疗效需要进一步观察.     

Experimental study on internal fixation of femoral neck fractures.

The relative strength and the failure mode of internal fixation by multiple pinning and nailing was investigated on 35 specimens. Internal fixation consisted of 3, 5 and 7 Knowles pins, a Smith-Petersen nail or a sliding nail plate. The strength of a specimen with a triflanged nail is only half of that with multiple Knowles pins. There is no significant difference in strength of 3, 5, or 7 pin specimens. The strength of an internal fixation with a sliding nail plate is not superior to the strength of multiple pinning. The mode of failure for the different types of internal fixation is primarily a crush fracture of the supporting trabecular bone at the femoral neck with downward and outward migration of the pins or nail. Except with the fixation with 3 pins where an initial bending could be observed, failure is not a plastic deformation of the internal fixation device.     

Fracture of the femoral neck after internal fixation

A case of femoral neck fracture despite the presence of a previously inserted sliding screw and sideplate is reported. Internal fixation in itself did not prevent subsequent fracture. A critical factor in the mechanism of this fracture was the patient's underlying disease, felt to be alcoholic osteomalacia.     

Computerized navigation for the internal fixation of femoral neck fractures

BACKGROUND: Accurate placement of cannulated screws is essential to ensure secure fixation of femoral neck fractures. We compared computerized navigation and conventional fluoroscopy with regard to the accuracy of screw placement for the fixation of femoral neck fractures. METHODS: We retrospectively compared two groups of twenty consecutive patients with a femoral neck fracture who underwent internal fixation with three cannulated screws. Computer-based navigation was used to guide screw placement in one group, and conventional fluoroscopy was used in the other group. Radiographic evaluation included the measurement of screw parallelism and spread, the calibrated distance from the lesser trochanter, and joint penetration. The follow-up period was two years. The rates of complications in both groups were evaluated. RESULTS: The navigation-assisted group had better screw parallelism and greater spread of the screws. There was a tendency for fewer reoperations and significantly fewer overall complications in the patients in whom computerized navigation was used (p < 0.018). CONCLUSIONS: Computerized navigation improves the accuracy of cannulated screw placement in the internal fixation of femoral neck fractures. It may provide better mechanical stability and improved fracture outcome.     

Clinical study on internal fixation of femoral neck fractures.

A clinical study on the results of internal fixation of femoral neck fractures treated by multiple Knowles pinning was undertaken and correlated with the results of an experimental study. Experimentally, failures were produced by downwards migration of the Knowles pins. This phenomenon accounts for the settling of the femoral head on the neck and the frequency of non-union or malunion in patients with subcapital fractures. The type of fracture, type of reduction and age correlate with failure rate. This has to be explained by biomechanical considerations based upon the mode of failure of the internal fixation. A Garden stage III and IV, a varus or anatomical reduction of the fracture and an old age predispose to failure of the internal fixation and consequent non-union.     

计算机导航下空心钉内固定治疗股骨颈骨折

目的 探讨计算机导航技术在股骨颈骨折空心钉内固定治疗中的应用，为骨折内固定提供一个新的手术技术。方法 8例股骨颈骨折，术前Garden分型为Ⅰ型3例，Ⅱ型4例，Ⅲ型1例。术中牵引复位后，通过一次C臂机透视正侧位，即可在计算机导航下完成内固定。术后常规透视复查。结果 8例病例全部在导航下完成空心钉的内固定，平均透视时间为15s，远远少于常规内固定所须的时间。结论 计算机导航技术成功应用于空心钉内固定手术，有效减少了手术中X射线的辐射，同时提高了手术的精度，可避免机械引导器的误差，随时反映操作的过程，使手术过程更方便、直观。     

Early weightbearing after classical internal fixation of medial fractures of the femoral neck.

This study is a survey of a series of 446 patients, treated in the city of Turku, Finland, between 1964 and 1971, for medial fractures of the femoral neck. Fractures were treated by means of the classical nailing method (nail placed along the central axis of the femoral neck, ad modum Smith-Petersen). An unselected group of patients were treated in such a way that they were already allowed to bear weight on the injured limb 2 weeks post-operatively (120 patients). The remaining patients were not allowed to bear weight on the injured limb until 12-14 weeks after nailing (261 patients). The progress of recovery was studied retrospectively, a comparison being made between the early and late weightbearers. Without reference to the type of fracture (according to the classifications of Garden or Pauwels) or to the method of fixing (Smith-Petersen nail, with or without side-plate) bone union was relatively more frequent and failures were relatively less frequent among early weightbearers than among late weightbearers. Early weightbearing had a beneficial effect upon the healing of the fracture and there was no evidence in the case of early weightbearers of any additional complications. A comparative study of the whole patient group on the basis of the time-lag between the accident and the operation--some were nailed 1-3 days, some 4-7 days and some more than a week after the fracture had taken place--revealed no significant differences.     

The value of washers in cannulated screw fixation of femoral neck fractures

BACKGROUND: Given the limited evidence to support the technical aspects of screw placement for treatment of femoral neck fractures, we conducted an observational study to evaluate demographic and radiographic variables associated with fixation failure. METHODS: Eligible patients with femoral neck fractures were treated with multiple cannulated screws across three academic centers during a 6-year period. The following variables were evaluated for their predictive value for fixation failure: age, gender, fracture type, presence of comminution, total number of screws, the absence of a washer, the screw configuration, reduction quality, the distance of the most inferior screw to the inferior neck, and screw alignment. Variables were evaluated separately and in a multivariable regression model. RESULTS: Eighty patients were included in the study. The overall failure rate was 30%. We identified four variables associated with fixation failure. These included the lack of washers (odds ratio [OR], 11.2; p = 0.03), imperfect quality of reduction (OR, 9.7; p < 0.01), age greater than 75 years (OR, 5.1; p = 0.04), and displaced versus undisplaced fracture type (OR, 3.8; p < 0.01). These four variables accounted for 43% of the variability in fixation failure (R(2) = 0.43). All other variables including the distance of the most inferior screw to the inferior/medial neck were found to be not significant. CONCLUSION: This study confirms previous findings in the literature that increased age, a displaced fracture type, and poor reduction increase the risk of fixation failure. Contradictory to current belief, there was no significant association between the distance of the inferior screw to the inferior/medial femoral neck cortex and fixation failure. A novel finding of the present study is that the use of washers significantly decreases the risk of fixation failure.     

The timing of bone SPECT to predict osteonecrosis after internal fixation of femur neck fractures

Background

Bone SPECT can be used after a femur neck fracture to assess the circulation of the femoral head in the immediate postoperative period because the blood supply is one of the major factors affecting bone uptake of radiotracer on bone scintigraphy. The purpose of our present study was to investigate whether osteonecrosis of the femoral head (OFH) after internal fixation of femoral neck fracture could be predicted by early and late bone SPECT.

Long-term outcome of patients with avascular necrosis,after internal fixation of femoral neck fractures

We retrospectively reviewed 84 patients who underwent internal fixation of an intracapsular femoral neck fracture. The mean age was 58 years and the time from injury to operative treatment was 5.3 days. The mean follow-up was 4.7 years (range, 2-8 years). At the latest follow-up, in the 46 patients with undisplaced (Garden I, II) fractures, nonunion occurred in two patients and avascular necrosis of the femoral head in nine. Six of these nine patients had a good or excellent result, one had a fair result, and two had a poor result. Of 35 patients with no sign of avascular necrosis, 32 patients had a good or excellent result, two a fair and one had a poor result. In the group of 38 patients with displaced (Garden III, IV) fractures, nonunion occurred in six patients and avascular necrosis of the femoral head in 15. Of these 15 patients, 10 had a good or excellent result, two had a fair result, and three had a poor result. Of 17 patients with no sign of avascular necrosis, 14 had an excellent result and three patients a poor result. Overall only five of the 24 patients who developed avascular necrosis of the femoral head had undergone total hip arthroplasty. Internal fixation remains a simple and safe, method of treatment for both undisplaced and displaced femoral neck fractures in middle-age patients. Despite the relatively high rate of avascular necrosis after internal fixation of femoral neck fractures, only a few of these patients (20%) required further surgical treatment in the follow-up period of this study.     

Arthroplasty versus internal fixation for femoral neck fractures in the elderly

We studied 140 patients with femoral neck fractures treated from January 1999 to December 2006. There were 68 men and 72 women with a mean age of 72 years (range 60–80 years). Seventy patients were treated with closed reduction and internal fixation (group A), and 70 patients with hip arthroplasty (group B). The duration of surgery, length of hospitalization, complications, postoperative Harris hip score, and need for reoperation were recorded. Group B had significantly higher blood loss, increased surgical time and length of hospitalization compared to group A patients. The Harris hip score was significantly higher in group B at the 3, 6, and 12-month follow-up evaluations; however, the differences were no longer significant at the 24-month evaluation. The overall complications rate was 18.6% (13 patients) in group A compared to 25.7% (18 patients) in group B; this was not statistically significant (P = 0.309). A statistically significant difference was found regarding reoperation rate in group A (11.4%, eight patients) compared to group B (1.4%, one patient) (P = 0.016). Arthroplasty compared to internal fixation for displaced femoral neck fractures is associated with a significantly higher functional score and lower risk of reoperation at the cost of greater infection rates, blood loss, and operative time.     

Undisplaced femoral neck fractures need a closed reduction before internal fixation

European Journal of Orthopaedic Surgery & Traumatology - Undisplaced femoral neck fractures (UFNF) are generally treated with in situ internal fixation, and few studies have addressed the...     

Intertrochanteric femoral fractures. Mechanical failure after internal fixation

In a prospective study we assessed the causes of mechanical failure in a series of 230 intertrochanteric femoral fractures which had been internally fixed with either a sliding hip screw or a Küntscher Y-nail. The overall rate of mechanical failure was 16.5%; cutting-out of the implant from the femoral head was the cause in three-quarters of the instances. Implants placed posteriorly in the femoral head cut out more often (27%) than those placed centrally (7%). The cut-out rate was also determined by the quality of the fracture reduction, but age, walking ability and bone density (assessed by the Singh grade and metacarpal indices) had no significant influence. We conclude that these fractures should be reduced as accurately as possible and it is imperative that the implant is placed centrally within the femoral head.     

The cost of hemiarthroplasty compared to that of internal fixation for femoral neck fractures

Background and purpose There is very little information on the cost of different treatments for femoral neck fractures. We assessed whether total hospital and societal costs of treatment of elderly patients with displaced femoral neck fractures differ between patients operated with internal fixation or hemiarthroplasty.

Methods 222 patients (mean age 83 years, 165 women (74%)) who had been randomized to internal fixation or hemiarthroplasty were followed for 2 years. Resource use in hospital, rehabilitation, community-based care, and nursing home use were identified, quantified, evaluated, and analyzed.

Results The average cost per patient for the initial hospital stay was lower for patients in the internal fixation group than in the hemiarthroplasty group (€9,044 vs. €11,887, p < 0.01). When all hospital costs, i.e. rehabilitation, reoperations, and formal and informal contact with the hospital were included, the costs were similar (€21,709 for internal fixation vs. €19,976 for hemiarthroplasty). When all costs were included (hospital admissions, cost of nursing home, and community-based care), internal fixation was the most expensive treatment (€47,186 vs. €38,615 (p = 0.09)).

Interpretation The initial lower average cost per patient for internal fixation as treatment for a femoral neck fracture cannot be used as an argument in favor of this treatment, since the average cost per patient is more than outweighed by subsequent costs, mainly due to a higher reoperation rate after internal fixation.