Objective To study the technique and effect of adjunctive cancellous screw in treatment of intertrochanteric fractures with dynamic hi p screw (DHS) fixation. Methods Between April 2004 and August 2007, 33 patients with intertrochanteric fracture were treated with DHS fixation and adjunctive cancellous screw. There were 13 males and 20 females, aging 43-82 years with an average age of 67 years. Fractures were caused by traffic accident in 7 patients, by fall ing from height in 11 patients, by sprain in 15 patients. All fractures were closed. The patients were operated 3-12 days after injury. According to Evans classification, there were 12 cases of type II, 15 cases of type III, and 6 cases of type IV. Twenty-twocases had osteoporosis. Weight bear time and compl ication were recorded. Fracture heal ing and neck-shaft angle were observed on radiogram. Hip functions were evaluated using Radford criterion. Results Thirty-three patients had no intraoperative compl ications with incision heal ing by first intension. All patients were followed up from 14 months to 38 months, with an average of 21 months. Fracture heal ing was achieved within 14 weeks to 21 weeks, with an average of 17 weeks after operations. The neck-shaft angles were (134.2 ± 13.7)° 3 days after operation, (128.6 ± 8.9)° 8 weeks after operation, and (128.5 ± 9.3)° after fracture heal ing, showing no significant difference when compared with that of the third day after operation (P gt; 0.05). According to the Radford criterion at last follow-up, the excellent and good rate of hi p function was 93.9% (excellent in 21 cases, good in 10 cases, and poor in 2 cases). Compl ications such as loosening, breakage, or grievous migration of hardware were not observed. Conclusion The adjunctive cancellous screw in treatment of intertrochanteric fractures with DHS fixation can provide counteraction of tension and rotation, promote fixation stabil ity, enhance fracture heal ing and decrease compl ication.
Objective To investigate the validity of improving the femur’s mechanical characteristics by implanting calcium phosphate ceramic screws after removing dynamic hip screw (DHS). Methods The three dimensional finite element model of the femur was built based on the CT scanning of a normal male volunteer. Then the models of the femur with and without DHS were established. According to calcium phosphate ceramic screws with porosity and apparent elastic modulus, 80% and 0.1 GPa were set as group A, 50% and 1.0 GPa as group B, and 30% and 1.5 GPa as group C. Von Mises stress distribution and maximum stress were recorded when the joint was maximally loaded in a gait cycle. Results The Von Mises in normal femoral shaft was uniform; no phenomena of stress concentration was observed and the maximum stress located at the joint load-bearing site of the proximal femur. The stress concentration was observed in the femur without DHS, and the maximum stress located at the distal femur around the screw hole. By comparing several different calcium phosphate ceramic screws, the stress distribution of group B was similar to normal femur model, and the maximum stress located at the joint load-bearing site. The other screws of groups A and C showed varying degrees of stress concentration. Conclusion Implanting calcium phosphate ceramic screw can improve the mechanical characteristics of the femur after removing dynamic hip screw, and the calcium phosphate ceramic screw with 50% porosity and 1.0 GPa apparent elastic modulus is suitable for implanting.
Objective To investigate the appl ication of anti-rotation screw after dynamic hi p screw (DHS) in treatment of intertrochanteric fracture. Methods Between April 2006 and January 2010, 22 cases of intertrochanteric fractures underwent DHS fixation operation with an anti-rotation screw, including 15 males and 7 females with an average ageof 66.3 years (range, 54-83 years). Fractures were caused by sl ipping in 16 cases, traffic accident in 5 cases, and fall ing from height in 1 case. All cases showed closed fractures, including 13 cases in the left and 9 cases in the right. Eighteen cases were simple intertrochanteric fracture, 4 cases were intertrochanteric fractures compl icated with Colles fractures. According to Evans classification standard, there were 14 cases of type I, 6 cases of type II, 1 case of type III, and 1 case of type IV. The time from wound to operation was 3-7 days (mean, 4.5 days). Results The operation time ranged from 51-95 minutes (mean, 72 minutes). The intraoperative blood loss was 150-350 mL (mean, 270 mL). The hospital ization days were 12-35 days (mean, 16.8 days). Primary heal ing was observed in all cases. All cases were followed up 6-17 months (mean, 14 months). Union of fracture was observed at 12-16 weeks (mean, 13.6 weeks); no fracture or internal fixation loosening occurred. According to HUANG Gongyi’s standard of efficacy assessment, the results were excellent in 19 cases and good in 3 cases. Conclusion Appl ication of an anti-rotation screw can help to improve the strength of the DHS for the internal fixation of intertrochanteric fracture, especially the anti-rotation abil ity, which does not increase the operation time obviously.
目的 比较股骨近端抗旋髓内钉（PFNA）与动力髋螺钉（DHS）两种方法内固定治疗高龄股骨粗隆间骨折的疗效。 方法 2007年1月－2011年1月分别采用PFNA、DHS治疗高龄股骨间粗隆骨折（EvansⅠ～Ⅳ型）共68例，其中PFNA组36例，平均年龄81.5岁；DHS组32例，平均年龄82.3岁。两组患者在年龄、性别、骨折分型、合并症以及受伤至手术时间方面比较差异均无统计学意义（P＞0.05），有可比性。 结果 术后68例患者均获随访，随访时间6～26个月。与DHS组比较，PFNA组手术时间短、术中出血少，差异有统计学意义（P＜0.05）；PFNA组骨性愈合时间短，但两组差异无统计学意义（P＞0.05）。术后DHS组出现1例髋内翻、1例拉力螺钉切出股骨头颈，PFNA组出现1例主钉退钉，两组术后并发症发生率比较差异有统计学意义（P＜0.01）。术后1年PFNA组髋关节Harris评分显著高于DHS组，差异有统计学意义（P＜0.01）。 结论 PFNA与DHS两种固定方法的骨性愈合时间短、术后并发症少、髋关节功能恢复好，是治疗股骨粗隆间骨折的良好方式，尤其是PFNA能减少手术时间和术中出血量，手术创伤小，对高龄且不能耐受较大手术者可作为一种首选术式。
目的 评价股骨近端防旋髓内钉（PFNA）、动力髋螺钉（DHS）、伽马钉治疗股骨转子间骨折的有效性和安全性。 方法 计算机检索Cochrane图书馆（2011年第12期），PubMed （1966年－2011年12月），EMBASE（1974年－2011年12月），web of science（1958年－2011年12月），万方数据库（1992年－2011年12月），维普资讯网（1989年－2011年12月），中国期刊全文数据库（1994年－2011年12月），中国生物医学文献数据库（1978年－2011年12月），纳入PFNA、DHS、伽马钉治疗股骨转子间骨折的随机前瞻性研究，采取修订后的Jadad评分量表对纳入研究进行质量评价。用RevMan 5.1软件进行Meta分析。 结果 共纳入12个研究（1 477例患者）。Meta分析结果显示PFNA治疗股骨转子间骨折的手术时间[MD=−32.19，95%CI（−49.69，−14.69），P=0.000 3；MD=−4.52，95%CI（−5.24，−3.80），P＜0.000 01］，出血量[MD=−183.06，95%CI（−277.37，−88.74），P=0.000 1；MD=−49.49，95%CI（−84.15，−14.83），P=0.005]少于DHS组和伽马钉组，但是三者在总有效率、住院时间和术后并发症等方面差异无统计学意义。DHS组与伽马钉组在所有指标差异均无统计学意义。 结论 与DHS、伽马钉相比，PFNA可明显缩短手术时间、降低术中出血量，但并不能提高总有效率、缩短住院时间以及减少术后并发症；而DHS与伽马钉治疗股骨转子间骨折的疗效无明显差异。
ObjectiveTo explore the effectiveness of dynamic hip screw (DHS) and intralesional curettage via Watson-Jones approach in treatment of benign bone lesions of the proximal femur.MethodsBetween March 2012 and December 2016, 20 patients (21 lesions) with benign bone tumors or tumor like conditions of proximal femurs were treated with DHS and intralesional curettage via Watson-Jones approach. Their average age was 27.8 years (range, 11-51 years), including 13 males and 7 females. The pathological diagnosis were fibrous dysplasia in 11 cases, simple bone cyst in 2 cases, aneurysmal bone cyst in 2 cases, benign fibrous histocytoma in 2 cases, giant cell tumor in 2 cases, and chondroblastoma in 1 case, including 3 pathological fractures. According to the Enneking staging system, 18 patients were in stage S1, 3 patients with pathological fractures in stage S2. There was no varus deformity or valgus deformity. The operation time, intraoperative blood loss, and time of full weight-bearing were recorded. X-ray film and CT were used to observe the bone graft fusion and location of DHS. Complications were recorded. Visual analogue scale (VAS) and Musculoskeletal Tumor Society (MSTS) scoring were used to evaluate function of lower limbs.ResultsThe average operation time was 177.1 minutes (range, 110-265 minutes). The average intraoperative blood loss was 828.6 mL (range, 200-2 300 mL). There was superficial incision infection in 1 case, deep incision infection in 1 case, and hip discomfort in 1 case, respectively. All patients were followed up 6-63 months (mean, 27.4 months). The time of full weight-bearing was 2 days in 2 patients with giant cell tumor and 2 to 13 weeks with an average of 7.2 weeks in the other patients. At last follow-up, VAS and MSTS were 0.19±0.51 and 29.62±0.97 respectively, showing significant differences when compared with the values before operation (3.52±2.62 and 23.71±8.77) (t=5.565, P=0.000; t=–3.020, P=0.007 ). X-ray film showed the all bone grafts fusion with mean time of 8.2 months (range, 5-12 months). There was no pathological fracture of the femur, local tumor recurrence, chronic hip pain, dislocation, or femoral head necrosis during follow-up.ConclusionThe treatment of benign bone lesion of the proximal femur using DHS and intralesional curettage via Watson-Jones approach is a safe and effective method.
Objective To compare the effectiveness of the proximal femoral nail antirotation (PFNA) and dynamic hip screw (DHS) in the treatment of elderly patients with intertrochanteric fractures. Methods Between May 2007 and May 2010, 63 elderly patients with intertrochanteric fractures were treated, and fractures were fixed with PFNA in 31 patients (PFNA group) and with DHS in 32 patients (DHS group). There was no significant difference in gender, age, injury cause, disease duration, and fracture type between 2 groups (P gt; 0.05). Results All incisions healed by first intention. The incision length, operation time, and blood loss in PFNA group were significantly less than those in DHS group (P lt; 0.05). The averagefollow-up time was 13.6 months in PFNA group and was 13.8 months in DHS group. The fracture heal ing time was (11.80 ± 1.32) weeks in PFNA group and was (12.21 ± 1.26) weeks in DHS group, showing no significant difference (t=1.23, P=0.29). The complication rate was 0 in PFNA group and was 12.5% (4/32) in DHS group, showing no significant difference (P=0.06). After 1 year, Harris hip score of PFNA group (86.55 ± 10.32) was higher than that of DHS group (80.36 ±11.18) (t=2.28, P=0.03). Conclusion There are two surgical methods to treat intertrochanteric fractures in the elderly patient: PFNA and DHS, and each has advantages; for unstable intertrochanteric fractures, PFNA treatment is the first choice.