Distribution and drug resistance of pathogens causing periprosthetic infections after hip and knee arthroplasty / 中国骨伤

OBJECTIVE@#To study the distribution and drug resistance of pathogens causing periprosthetic infections after hip and knee arthroplasty, and to formulate prevention and treatment strategies for drug-resistant bacteria.@*METHODS@#The data of 146 cases of periprosthetic infection after primary hip and knee arthroplasty from 2010 to 2015 were collected, including 111 cases of periprosthetic infection after hip arthroplasty and 35 cases of periprosthetic infection after knee arthroplasty. The culture positive rate, pathogenic bacteria composition and drug resistance rate were counted over the years, and the change trend of pathogen distribution and drug resistance was analyzed.@*RESULTS@#One hundredand eight strains of pathogenic bacteria were detected in 146 cases, and the positive rate of culture was 73.97%. Gram positive bacteria accounted for 55.48%, Staphylococcus epidermidis and Staphylococcus aureus accounted for 25.34% and 15.07% respectively. Gram negative bacteria accounted for 13.01%, including Enterobacter cloacae, Pseudomonas aeruginosa and Escherichia coli. There were 4 cases of Mycobacterium tuberculosis infection and mixed infection. The results of culture over the years showed that the constituent ratio of Gram positive bacteria had an increasing trend, fluctuating from 39.13% to 76.47%. The results of drug sensitivity showed that the pathogens were highly resistant to β-lactams, quinolones, clindamycin and gentamicin, and the drug resistance rate was increasing, but it was still sensitive to rifampicin, nitrofurantoin, tigecycline, linezolid and vancomycin.@*CONCLUSION@#Gram positive bacteria are the main pathogens of periprosthetic infection, and the proportion is increasing gradually.The pathogens have high resistance to many kinds of antibiotics, and the resistance rate is still increasing. To strengthen the monitoring of the distribution and drug resistance of pathogenic bacteria is helpful to grasp its change trend and formulate targeted prevention and control strategies.

Incidence and anatomic distribution of venous thromboembolism following primary total hip and knee arthroplasty: a prospective observational study / 中国骨伤

<p><b>OBJECTIVE</b>To analyze the incidence and anatomic distribution of venous thrombosis after total hip and knee arthroplasty by using the data of the patients with primary total hip and knee replacement.</p><p><b>METHODS</b>From December 2013 to December 2014, total hip and knee arthroplasty were performed in 1 686 patients, of which 928 were THA and 758 were TKA. Before and after discharge, all patients were routinely performed double lower limb vein color Doppler ultrasound, the conventional use of anti fibrinolytic drugs, postoperative anticoagulation for 14 d. The types and distribution of thrombosis after operation were statistical analysis.</p><p><b>RESULTS</b>Among 928 cases of primary total hip arthroplasty, there were 30 cases of thrombosis, 27 cases of isolated muscle vein thrombosis, followed by the involvement of the anterior or posterior tibial vein thrombosis, no central thrombosis. Among 758 cases of primary total knee arthroplasty, there were 87 cases of thrombosis, 81 cases peripheral thrombosis, 4 cases of thrombus of center type, the remaining 2 cases for mixed thrombus;74 patients with thrombosis involving a single vein, 65 cases involved muscle vein, 4 cases of femoral vein, 3 cases of posterior tibial vein, 2 cases of superficial vein; 13 cases of thrombosis involving multiple veins, involving muscle vein, posterior tibial veins, the peroneal veins and popliteal vein in 2 or 3 branches. The comparison results showed that the incidence of thrombosis after total knee arthroplasty was higher, the difference was statistically significant (<0.001), and more prone to central thrombosis and multiple venous involvement.</p><p><b>CONCLUSIONS</b>The incidence of thrombosis in patients with primary hip and knee replacement is low, and the incidence and anatomic distribution of the patients with primary hip and knee replacement are different.</p>

Treatment of osteoporotic intertrochanteric fractures by zoledronic acid injection combined with proximal femoral nail anti-rotation / 中华创伤杂志(英文版)

<p><b>OBJECTIVE</b>To observe the clinical results of proximal femoral nail anti-rotation (PFNA) combined with zoledronic acid injection in the treatment of osteoporotic intertrochanteric fractures in the elderly.</p><p><b>METHODS</b>60 elderly patients with osteoporotic intertrochanteric fractures were diagnosed using a dual energy X-ray bone density instrument. Patients were randomly divided into treatment or control groups (30 cases in each group). Patients in both groups were treated by closed/open reduction and internal fixation using PFNA. In the treatment group, patients received one zoledronic phosphonic acid injection of 5 mg/100 ml via intravenous drip, in addition to 600 mg of Caltrate D (qd) and 0.25 mg of alpha ossification alcohol (qd). The control group received 600 mg of Caltrate D (qd) and 0.25 mg of alpha ossification alcohol (qd). The oral drugs were administered for 12 months. Bone pain relief was observed, and changes in the bone mineral density (BMD) of the lumbar and health-side hip were recorded. Clinical results were evaluated using the Visual Analogue Scale (VAS), Harris joint function score, and Osteo- porosis Quality of Life Scale (OQOLS).</p><p><b>RESULTS</b>Compared with the control group, bone pain symptoms were significantly alleviated (p < 0.05) in the treatment group. In the treatment and control groups, both between-group and within-group differences in BMD were significantly increased in L1e4, femoral neck and trochanter (p < 0.05). No significant differences were found between the two groups in regard to the involved hip or the total rate of improvement at the end of the follow-up period, although cases in the treatment group had higher OQOLS scores than those of the controls (p = 0.04). Cases in the treatment group healed more quickly than those in the control group [(13 ± 3.2) weeks vs (15 ± 4.6) weeks, p = 0.02]. During the follow-up period, cases in the treatment group had no new fractures, whereas 2 new cases of hip fracture and 2 cases of distal radial fractures were observed among the controls.</p><p><b>CONCLUSION</b>Zoledronic acid injection combined with PFNA is a favorable treatment option for the elderly patients with osteoporotic intertrochanteric fracture. It can effectively relieve bone pain, increase bone density, improve quality of life, reduce the occurrence of new fractures and promote fracture healing.</p>

Accuracy of a Simple Digital Templating in Primary Uncemented Total Hip Arthroplasty / 中国医学科学杂志(英文版)

<p><b>OBJECTIVE</b>To introduce a simple preoperative digital templating in uncemented total hip arthroplasty (THA) and to determine its accuracy for preoperative size selection of the prostheses.</p><p><b>METHODS</b>A prospective study of digital planned THAs was performed on 90 hips with different types of prostheses from August 2013 to Angust 2014. The plastic templates of different types of prostheses were scanned for desired digital templating and the scanned images were then processed to the transparent, digital templates using Photoshop software. We calibrated the scales of the digital templates with the preoperative radiographs, and then selected the right size of the component. The preoperatively digital planned component sizes were compared to the actual sizes used in the operation, as well as the preoperatively traditional planned sizes.</p><p><b>RESULTS</b>In either cup or stem templating, no difference was found among the groups with different types of prostheses, and the accuracy of digital templating was statistically higher than traditional templating. In cup templating, digital planned and implanted cup sizes were identical in 43.33% of the cases, 78.89% of the cup sizes were predicted within 1 size (± 2mm) and 95.56% were predicted within 2 sizes (± 4 mm), all significantly higher than the results of traditional planned sizes (30.00%, P=0.044; 61.11%, P=0.007; 82.22%, P=0.004). The exact femoral stem size was predicted in 40.00% of cases using the digital templating, 84.44% of stem sizes were predicted within 1 size, and 93.33% within 2 sizes, better than using traditional templating (25.56%, P=0.028; 53.33%, P<0.001; 77.77%, P=0.003).</p><p><b>CONCLUSION</b>This simple digital preoperative templating is an accurate and reproducible process to preoperatively predict the implant size of uncemented THA.</p>

Periacetabular stress distributions during normal gait cycle and its guiding function in acetabular reconstruction of THA / 医用生物力学

Objective To study the basic regular patterns of stress distributions inside and outside periacetabular districts during normal gait cycle of healthy adults, so as to provide clinical guidance for acetabular reconstruction of total hip arthroplasty (THA). Methods Based on CT scans of a male and a female healthy adult volunteer, The three-dimensional model including pelvis and proximal femur was reconstructed. By using an inhomogeneous material distribution scheme which was based on CT data to calculate elastic modulus and convergence analysis, each element was given a corresponding material attribute. The dynamic change of hip contact force during a normal gait cycle was used as the load condition to the model. Von Mises stress of the nodes inside and outside the model was considered as the criterion to assess the results. Results During normal gait, the stress on the hip surface of two volunteers was mainly transmitted from postersuperior part of acetabulum to auricular surface along posterolateral of iliac wing, and the maximum stress was at the district near greater sciatic. As for the superior, middle and inferior section of two volunteers' acetabulum, the stress was distributed both on cortical and cancellous bone of postersuperior part. However, in terms of acetabular anterior and posterior column, the stress distribution was mainly found on cortical bone. Conclusions According to the observed acetabular stress distribution pattern of health adults during normal gait cycle, choosing acetabular component with more suitable size and controlling the placement of acetabular component with more accuracy could obtain some acetabular reconstruction plan better in accordance with stress distributions during normal gait.

Influence from acetabular component orientation on stress distributions of periacetabulum / 医用生物力学

Abstract： Objective To study the influence from different placement angles of acetabular component on inner and outer stress distributions of periacetabulum in acetabular reconstruction of total hip arthroplasty (THA), so as to explore proper orientation for improving stability of acetabular component after THA. Methods Based on model with inhomogeneous material property assignment, nine THA models with acetabular component at different anteversion angles(15°, 20°, 25°) and abduction angles(40°, 45°, 50°) as well as one normal hip model were constructed. The maximal hip contact force in phase of single leg stance during normal gait cycle was chosen as the loading condition. In addition, according to the qualitative and quantitative principle, inner and outer stress distributions on 9 THA models were analyzed and compared with the normal hip model as control. Results When abduction angle of acetabular component was the nearest to anatomic angle (19° anteversion, 46° abduction) of acetabulum, the phenomenon of stress shielding on periacetabulum was the most obvious. When abduction angle of acetabular component was placed at 45° and anteversion angle changed from 15° to 25°, no significant influence was exerted on the whole stress distributions of THA models. Meanwhile, when anteversion angle of acetabular component was 15°, the THA model had good stability in stress distributions, and the phenomenon of stress shielding on cortical and cancellous bone was obviously improved. Conclusions For patients who have normal anatomic acetabulum and need to be treated with THA, the abduction angle of acetabular component should be placed at 45°, as that of normal acetabulum; the anteversion angle should be 5° smaller than that of normal acetabulum and between 15° and 20°.

Infectious complications in patients with crush syndrome following the Wenchuan earthquake / 中华创伤杂志(英文版)

<p><b>OBJECTIVE</b>To analyze the results of clinical and bacteriological examinations in patients with crush syndrome who suffered infectious complications after an earthquake in Sichuan, China.</p><p><b>METHODS</b>A total of 313 bacteriological samples among 147 patients with crush syndrome were collected. Infectious complications, results of microbiological examinations, potential risk factors of infection and mortality were analyzed statistically.</p><p><b>RESULTS</b>In the obtained database, 112 out of the 147 (75.7%) patients had infectious complications, in which, wound infection, pulmonary infection, and sepsis were most common. The time under the rubble and the time from injury to treatment were related to the occurrence of wound infection (P equal to 0.013, odds ratio 2.25; P equal to 0.017, odds ratio 2.31). Sepsis and wound infection were more common in patients who underwent fasciotomy or amputation than in those who did not (P equal to 0.001).</p><p><b>CONCLUSION</b>Quick rescue and injury treatment can decrease the infection risk in crush syndrome patients. It is better to obtain microorganic proofs before applying antibiotics, and bacteriological and drug sensitivity data should be taken into account, especially considering that most of these infections are hospital-acquired and drug resistance. Emphasizing the accuracy and efficiency of wound management in emergency situations, cautiously assessing the indications for fasciotomy to avoid open wounds from unnecessary osteofascial compartment decompression incisions may decrease the incidence of infection and ameliorate the prognosis.</p>

Management of limb fractures in a teaching hospital: comparison between Wenchuan and Yushu earthquakes / 中华创伤杂志(英文版)

<p><b>OBJECTIVE</b>To comparatively analyze the medical records of patients with limb fractures as well as rescue strategy in Wenchuan and Yushu earthquakes so as to provide references for post-earthquake rescue.</p><p><b>METHODS</b>We retrospectively investigated 944 patients sustaining limb fractures, including 891 in Wenchuan earthquake and 53 in Yushu earthquake, who were admitted to West China Hospital (WCH) of Sichuan University.</p><p><b>RESULTS</b>In Wenchuan earthquake, WCH met its three peaks of limb fracture patients influx, on post-earthquake day (PED) 2, 8 and 14 respectively. Between PED 3-14, 585 patients were transferred from WCH to other hospitals outside the Sichuan Province. In Yushu earthquake, the maximum influx of limb fracture patients happened on PED 3, and no one was shifted to other hospitals. Both in Wenchuan and Yushu earthquakes, most limb fractures were caused by blunt strike and crush/burying. In Wenchuan earthquake, there were 396 (396/942, 42.0%) open limb fractures, including 28 Gustilo I, 201 Gustilo II and 167 Gustilo III injuries. But in Yushu earthquake, the incidence of open limb fracture was much lower (6/61, 9.8%). The percent of patients with acute complications in Wenchuan earthquake (167/891, 18.7%) was much higher than that in Yushu earthquake (5/53, 3.8%). In Wenchuan earthquake rescue, 1 018 surgeries were done, composed of debridement in 376, internal fixation in 283, external fixation in 119, and vacuum sealing drainage in 117, etc. While among the 64 surgeries in Yushu earthquake rescue, the internal fixation for limb fracture was mostly adopted. All patients received proper treatment and survived except one who died due to multiple organs failure in Wenchuan earthquake.</p><p><b>CONCLUSION</b>Provision of suitable and sufficient medical care in a catastrophe can only be achieved by construction of sophisticated national disaster medical system, prediction of the injury types and number of injuries, and confirmation of participating hospitals?exact role. Based on the valuable rescue experiences after Wenchuan earthquake, the rescue was faster, more orderly and effective in Yushu earthquake. Nevertheless, there is still a long way to go in the development of a stronger emergent response to the disasters.</p>

Meta-analysis comparing total hip arthroplasty with hemiarthroplasty in the treatment of displaced femoral neck fractures in patients over 70 years old / 中华创伤杂志(英文版)

<p><b>OBJECTIVE</b>Total hip arthroplasty (THA) and hemiarthroplasty (HA) are effective methods currently used to treat femoral neck fracture in elderly patients, but the two options remain controversial in patients over 70 years old. The main purpose of our study was to determine whether THA or HA is a superior treatment of femoral fractures involving a displaced neck in patients who are over 70 years of age.</p><p><b>METHODS</b>A computer-based online search of Medline (1970-2011), PubMed (1977-2011), and the Cochrane Central Register of Controlled Trials (2002-2011) was conducted. Six relevant randomized controlled trials with a total of 739 patients were included for the final analysis. The analysis was performed with software RevMan 5.0.</p><p><b>RESULTS</b>We found that compared with THA, HA needed shorter average time and lost less blood. While over the long-term follow-up, THA patients exhibited significantly less pain and better function and were less likely to require a revision hip surgery. Postoperative infection was equally common among HA and THA patients.</p><p><b>CONCLUSIONS</b>The significant differences in outcomes suggest that THA is a valuable treatment option for active elderly hip fracture individuals. However, patients who are older, impaired or institutionalized benefit from HA.</p>

Timing of internal fixation and effect on Schatzker IV-VI tibial plateau fractures / 中华创伤杂志(英文版)

<p><b>OBJECTIVE</b>To study the effect of internal fixation performed at different times on therapeutic outcomes of Schatzker IV-VI tibial plateau fractures.</p><p><b>METHODS</b>The clinical data of 42 cases of Schatzker IV-VI tibial plateau fractures treated in our department were analyzed retrospectively. Among these 42 patients, 21 received surgical treatment within 12 h after injury (Group I), the other 21 were first treated by traction or plaster fixation followed by a delayed internal fixation after soft tissue swelling subsided (Group II). The surgical time, complications, length of hospital stay, cost of hospitalization, and time for fracture union, as well as functional recovery were analyzed and compared between the two groups.</p><p><b>RESULTS</b>After 10-28 months follow-up (mean 16.5 months), except 5 cases who lost to follow-up, no differences were found between the two groups regarding surgical time, preoperative and postoperative complications, healing time or the Hospital for Special Surgery (HSS) score at the end of follow-up, but significant differences were found in the length of hospital stay, cost of hospitalization and HSS score at 3 months after operation (P less than 0.05).</p><p><b>CONCLUSION</b>Under certain conditions, early internal fixation for Schatzker IV-VI tibial plateau fracture is feasible, which can shorten the length of hospital stay, decrease the cost of hospitalization and promote early functional rehabilitation.</p>

Glucocorticoids affect the metabolism of bone marrow stromal cells and lead to osteonecrosis of the femoral head: a review / 中华医学杂志(英文版)

<p><b>OBJECTIVE</b>To review the recent developments in the mechanisms of glucocorticoids induced osteonecrosis of femoral head (ONFH) and introduce a new theory of ONFH.</p><p><b>DATA SOURCES</b>Both Chinese- and English-language literatures were searched using MEDLINE (1997 - 2011), Pubmed (1997 - 2011) and the Index of Chinese-language Literature (1997 - 2011).</p><p><b>STUDY SELECTION</b>Data from published articles about mechanisms of glucocorticoids induced ONFH in recent domestic and foreign literature were selected. Data extraction Data were mainly extracted from 61 articles which are listed in the reference section of this review.</p><p><b>RESULTS</b>Glucocorticoids are steroid hormones secreted by the adrenal cortex that play a pivotal role in the regulation of a variety of developmental, metabolic and immune functions. However, high dose of exogenous glucocorticoids usage is the most common non-traumatic cause of ONFH. Glucocorticoids can affect the metabolisms of osteoblasts, osteoclasts, bone marrow stromal cells and adipocytes which decrease osteoblasts formation but increase adipocytes formation and cause ONFH finally.</p><p><b>CONCLUSIONS</b>Glucocorticoids affect the differentiation of mesenchymal stem cells, through activating or inhibiting the related transcript regulators of osteogenesis and adipogenesis. At last, the size and volume of mesenchymal stem cells derived adipocytes will increase amazingly, but the osteoblasts will be decreased obviously. In the meantime, the activity of the osteoclasts will be activated. So, these mechanisms work together and lead to ONFH.</p>

Comparison of screw' inserting angle through the 11th and 12th rib anterior approaches for L1 burst fracture / 中国骨伤

<p><b>OBJECTIVE</b>To compare screw's inserting angle through the 11th and 12th rib in treating L1 burst fracture, explore effects on inserting screw and postoperative angle.</p><p><b>METHODS</b>From October 2007 to October 2010, 108 patients with L1 brust fracture treated through anterior approach were analyzed,including 68 males and 40 females, aged from 21 to 64 years (mean 38.22 years). All patients were divided into the 11th (A, 51 cases) and 12th (B, 57 cases) approach. The data of operation time,blood loss, duration of incision pain, JOA score, Oswestry score, VAS score, quality of life (SF-36), recovery of nervous function, coronal Cobb angle, included angle between screw and plate were observed.</p><p><b>RESULTS</b>All patients were followed up for 9 to 37 months, mean 23 months. The operation time, blood loss, duration of incision pain, in group A were lower than group B (P<0.05), JOA score, Oswestry score, VAS score, SF-36, recovery of nervous function had no significant differences (P>0.05). There were no differences in Cobb angle before operation, but had significance after operation (P=0.000). There were statistically significance between two group in angle between screw and plate (P=0.000, P=0.003).</p><p><b>CONCLUSION</b>The 11th rib approach for the treatment of L1 burst fracture has less effects on screw, less trauma and less angle between screw and plate.</p>

Midterm to long-term follow-up study after hybrid total hip arthroplasty / 中华外科杂志

<p><b>OBJECTIVE</b>To evaluate clinical and radiographic results and influencing factors of hybrid total hip arthroplasty (THA).</p><p><b>METHODS</b>Totally 126 patients (135 hips) from January 1999 to December 2001 accepted hybrid THA were followed up. Components migration, periprosthetic bone changes, the polyethylene wear rate were measured radiologically. Kaplan-Meier analysis was performed to evaluate the survival of the acetabular and femoral components. End point was obvious radiological loosening or revision either or both of the acetabular and femoral components for aseptic loosening, infection or osteolysis debridement surgery.</p><p><b>RESULTS</b>A total of 79 cases (85 hips) had been given follow-up. Using revision as the end point, the survival rate of acetabular was 95.2%, cemented femoral components was 98.8%. Using loosening as the end point for failure, the survival rate of acetabular was 97.6%, cemented femoral components was 100%.</p><p><b>CONCLUSIONS</b>The hybrid total hip prosthesis long-term survival rate was satisfactory, especially in the femoral side. As a result of third-cement technology, the long-term survival rate of the femoral components was close to the modern cementless prosthesis.</p>

Application of n-HA/PA66 composite artificial vertebral body in anterior reconstruction of lower cervical spine fracture and dislocation / 中华外科杂志

<p><b>OBJECTIVE</b>To initially evaluate the application of artificial vertebra of n-HA/PA66 in anterior reconstruction of lower cervical spine fracture and dislocation.</p><p><b>METHODS</b>In this study, 84 patients with lower cervical spine fracture and dislocation received anterior cervical discectomy, spinal canal decompression or subtotal corpectomy, spinal canal decompression and reconstruction by n-HA/PA66 composite artificial vertebral body combined with plate instrumentation. Neurological function was followed up by improvement rate of Frankel and situations of the supporting body was observed by X ray and 3D-CT in 3, 12, 24 months postoperatively. The intervertebral height, physical arc (reflected by Cobb angle) and the locations and fusion rate of the supporting body were assessed in order to evaluate the stability of the cervical spine and alignment improvements.</p><p><b>RESULTS</b>All the patients underwent operation successfully and were followed up for 6 to 24 months with an average of 12 months. The preoperative symptoms were improved to varying degrees. Imaging studies showed that in all cases graft fusion were achieved, and cervical alignments, intervertebral height, cervical spine stability and the locations of the artificial vertebral body were well maintained. No displacement and subsidence of the artificial vertebral body occurred. Postoperative immediate intervertebral height (2.4 ± 0.2) cm, preoperative intervertebral height (1.9 ± 0.1) cm, comparisons of the two groups was statistically significant (q = 2.48, P < 0.001). The immediate, 3 month, 1 year, 2 year period follow-up group intervertebral height was not statistically significant (P > 0.05). Preoperative Cobb angle was 9.8° ± 1.2°, postoperative immediate Cobb angle was 16.6° ± 1.2°, comparisons of the two groups was statistically significant (q = 14.25, P < 0.001). The immediate, 3 month, 1 year, 2 year period follow-up group Cobb angle was not statistically significant (P > 0.05).</p><p><b>CONCLUSIONS</b>n-HA/PA66 artificial vertebral body can provide early cervical spine support and stability and effectively maintain the biological alignment and cervical intervertebral height. It has high rate of graft fusion and is convenient to observe by X-ray. Therefore, n-HA/PA66 can be taken as an ideal graft for anterior lower cervical spine fracture and dislocation operation, but further follow-up study is still required to evaluate the long-term effects.</p>

Treatment of developmental dysplasia of hip by modified Sutherland pelvic osteotomy / 中华外科杂志

<p><b>OBJECTIVE</b>To investigate the clinical results of modified Sutherland pelvic osteotomy for developmental dysplasia of hip (DDH).</p><p><b>METHODS</b>Sutherland pelvic osteotomy were performed in 10 patients (11 hips) with DDH. Among them, there were 3 male (3 hips) and 7 female (8 hips) patients, aged (32 ± 8) years. During operation, arthroscopes were performed additionally to remove the existing hyperplasia tissue in the fossae ovalis and trimming acetabulum and glenoid labrum, thus to insure the better match between the femoral head and the realigned acetabulum. The change of imaging indexes were acquired by comparing the preoperative X-ray with the postoperative X-ray. The change of hip function and life quality were acknowledged according to contrast and analysis Harris hip score and Short Form 12-items Health Survey (SF-12) before and after osteotomy.</p><p><b>RESULTS</b>All patients were followed up for a mean of (5.2 ± 2.3) years, the osteotomy were all union in 3 months. The acetabular head index was 71 ± 8 before operation, and 86 ± 4 after operation. The pre- and post-operative centre edge angle were (7 ± 9)° and (33 ± 9)°, sharp angle were (48 ± 4)° and (37 ± 5)°, acetabular index angle were (24 ± 8)° and (11 ± 5)° respectively. The average Harris score improved from 42 ± 13 preoperatively to 90 ± 5 postoperatively, with 100% excellent and good results. Every domains of SF-12 was improved in the different extents postoperatively, the improvement of physical component summary was more conspicuous than mental component summary. The imaging indexes, Harris and SF-12 were all improved with significant difference (all P < 0.05).</p><p><b>CONCLUSIONS</b>The modified Sutherland pelvic osteotomy is effective. It could increase the load bearing capacity of hip, and improve the quality of life.</p>

Impaction morselized allografting combined with cementless long stem for femoral defects in femoral component revision / 中华外科杂志

<p><b>OBJECTIVE</b>To retrospectively analyze the clinical and radiological results of the impaction morselized allografting combined with cementless long stem for femoral component revision in patients with significant bone loss.</p><p><b>METHODS</b>From July 2003 to June 2009, 27 patients (27 hips) underwent revision hip arthroplasty in femurs with bone defect using impaction allografting and cementless components. There were 15 male and 12 female with mean age of 67 years. According to the Paprosky classification system, the bone defects in femur were classified into type II in 3 cases, type III in 21 cases and type IV 3 cases. The patients were followed up postoperatively to observe the clinical and radiological results, and if there had the stem subsidence, periprosthetic fracture, infection and other complications.</p><p><b>RESULTS</b>Twenty-three patients were followed up. The mean follow-up time was 26 months. Harris score improved from 43 points pre-revision to 83 points at the final follow-up. No femoral stem loosening and failure occurred. There were 4 stem with a mean 3.3 mm subsidence. One case had an acute infection after revision and treated successfully by debridement and drainage, antibiotics. No stem need further revision. Radiographic analysis showed all the revised stem was stable, and graft incorporation was seen in at least 1 zone in 100% of the femurs.</p><p><b>CONCLUSION</b>The results of this study demonstrates that femoral support and vigorous impaction grafting combined with cementless long stem results in an good intermediated-term clinical effects.</p>

Cortical windowing of the femoral diaphysis for cement/plug removal in hip revision surgery / 中华外科杂志

<p><b>OBJECTIVE</b>To analyze the results of cortical windowing of the femoral diaphysis for well-fixed cement/plug removal during hip revision surgery.</p><p><b>METHODS</b>From May 2005 to June 2009, 14 patients (14 hips) were undergone revision total hip arthroplasty (THA), window was cut into the cortex of the femur, and the well-fixed cement/plug distal to the window was removed under the direct vision. After reimplanted the cementless revision stem, the cortical lids were replanted and fixed with 2 to 3 cerclage wires. Six patients who had suffered from osteoporosis were undergone morselized bone graft to the osteotomy site. Postoperatively, the patients were maintained at partial weight-bearing (touchdown) for 6 weeks and then advanced as they were able.</p><p><b>RESULTS</b>The length of the cortical windows varied from 2.5 to 6.0 cm (mean, 3.4 cm), the width ranged from 0.8 to 1.4 cm (mean, 1.2 cm). In one patient the window was enlarged during the procedure to facilitate the cement/plug removal. The mean radiologically healing time for the windows was 19 weeks. There was no intraoperative femoral perforation during cement/plug removal. One femoral fracture during the revision stem was implanted. No postoperative periprosthetic fracture and other complications such as infection, implant subsidence occurred during the fellow-up. There was no femoral thigh pain or implant loosening with femoral window.</p><p><b>CONCLUSION</b>The cortical windowing technique is very helpful to facilitate the well-fixed cement/plug distal to the prosthesis tip removal and the windows heal rapidly and decrease the femoral complications associated with revision THA.</p>

Treatment for 332 cases of lower leg fracture in "5.12" Wenchuan earthquake / 中华创伤杂志(英文版)

<p><b>OBJECTIVE</b>To retrospectively analyze the medical treatment of 332 patients with lower leg fracture in Wenchuan earthquake admitted in West China Hospital.</p><p><b>METHODS</b>From May 12, 2008 to June 15, 2008, 332 patients with lower leg fracture injured in Wenchuan earthquake were treated in our hospital. The data on trauma condition and clinical treatment were collected and analyzed.</p><p><b>RESULTS</b>Among the 332 cases of lower leg fracture, there were 179 cases of open fracture, accounting for 53.9%, in which 91% belonged to Gustilo II or III injury with serious pollution. Many patients had posttraumatic complications, vascular and nerve injury, wound infection or osteofascial compartment syndrome. After medical treatment, blood vessels were reconnected, wound surface was repaired and wound infection was under control.</p><p><b>CONCLUSION</b>For the patients with lower leg fracture in earthquake, we followed the principle of "complete debridement - restoring the continuity of bone bracket-timely recovering blood supply of limbs and repairing nerve damage - repair the wound surface at stage I or II " so as to reduce the incidence of amputation and infection.</p>

Challenges for rear hospital care of Wenchuan earthquake casualties: experience from West China Hospital / 中华创伤杂志(英文版)

To review the challenges and countermeasures in the hospital care for Wenchuan earthquake casualties and draw lessons for the protective response in the future. Medical records and laboratory findings of the victims admitted in West China Hospital (WCH) were retrospectively analyzed. Related data were compared between beforemath and aftermath of the earthquake and between WCH and frontier county hospitals. One thousand and thirty-one earthquake survivors were hospitalized, 1 358 victims underwent surgery and 142 victims were transferred to intensive care unit. The incidence of infection, crush syndrome and multiple organ dysfunction syndrome (MODS) was 39.6%, 20.7% and 2.3% respectively. Wound classification showed that the incidence of extremity damage was 72%, while the incidence of chest trauma, abdominal trauma and brain trauma was less than 10% respectively. Isolating rates of environmental pathogens were increased in the aftermath of earthquake, and the spectrum of the pathogens and related antibiotic sensitivities were quite different from those in the beforemath of earthquake. The social economic and population conditions in the earthquake-stricken areas affected the composition of the victims and the geographic features restricted the efficiency of rescue. Trauma-induced MODS, crush syndrome and severe infections all constituted the dilemma for the hospital care, to resolve whether the multidiscipline team work was proved to be an optimizing choice. For a more effective disaster protective response in the future, the study on rescue plan and the ladder therapies for massive casualties should be potentiated.

Preliminary effect of proximal femoral nail antirotation on emergency treatment of senile patients with intertrochanteric fracture / 中华创伤杂志(英文版)

<p><b>OBJECTIVE</b>To retrospectively analyse the clinical outcome of emergency treatment of senile intertrochanteric fractures with proximal femoral nail antirotation (PFNA).</p><p><b>METHODS</b>From September 2008 to March 2009, 35 senile patients with intertrochanteric fracture, aged from 65 to 92 years with an average age of 76.5 years, were treated with PFNA within 24 hours after injury. There were 10 type I fractures, 19 type II and 6 type III according to upgraded Evans-Jensen classification system. All patients were complicated with osteoporosis, and 19 patients had preexisting internal medical diseases. According to the rating scale of disease severity by the American Society of Anesthesiologists (ASA), there were 9 grade I, 14 grade II, 8 grade III, and 4 grade IV.</p><p><b>RESULTS</b>The duration for operation ranged from 45 to 73 minutes with an average of 57.6 minutes. The volume of blood loss during operation ranged from 50 to 120 ml with an average of 77.5 ml. Patients could ambulate 2-4 days after operation (mean 3.5 days). Hospital stay was 4-7 days (mean 5.3 days). Full weight bearing time was 10-14 weeks (mean 12.8 weeks). During hospitalization period, there was no regional or deep infection, hypostatic pneumonia, urinary tract infection and bedsore except for 2 cases of urine retention. All cases were followed up with an average period of 12.3 months, and bone healing achieved within 15-18 weeks (mean 16.6 weeks). No complications such as delayed union, coxa vara or coxa valga, screw breakage or backout occurred and only 2 cases had trochanter bursitis because of thin body and overlong end of the antirotated nail. According to the Harris grading scale, the results were defined as excellent in 21 cases, good in 9 cases and fair in 5 cases, with the excellent and good rates of 85.7%.</p><p><b>CONCLUSION</b>The emergency treatment of senile intertrochanteric fracture with proximal femoral nail antirotation has the advantages of minimal invasion, easy manipulation, less blood loss, shorter length of stay, less complications, and the preliminary clinical effect is satisfactory.</p>