Digital technology is a hot spot in the orthopedic research in recent years.Computer-aided orthopaedic surgery is a kind of interdisciplinary and frontier technology,usually involving preoperative design and plan,virtual operation,intraoperative navigation and implementation.The application of computer-aided techniques in the treatment of proximal humeral fractures was summarized in this article.We intended to inform surgeons of the digital techniques which have been efficiently used in the clinic and improved the efficacy of PHF treatment.

Objective To evaluate development of postoperative complications of calcanens fracture by employing Evidence-based medicine method so as to provide basis for clinical treatment strategy. Methods Eligible literatures on surgical treatment of calcalneus fractures from 1989 to 2008 were retrieved through Medline, Cochrane Database, Embase Database and Science Direct. The retrieved literatures were organized and analyzed by using SPSS14.0 and RevMan5 software. Results A total of 1823 literatures on calcaneus fractures were originally obtained based on preset retrieval conditions. With screening and evaluation, 29 clinical reports involving 2 661 patients (2 800 feet) met the criteria of meta-analysis. The results of recta-analysis indicated that the incidence rates (IR) and confidence interval (CI) of the complications that included infection (IC =8.6%, 95% CI =7.53-9.61), wound-edge necrosis (IC =2.6%, 95% CI =2.05-3.24), subtalar arthritis (IC =2.0%, 95% CI = 1.42-2.44), peroneal tendinitis (IC = 1.3% , 95% CI = 0.84-1.66), vascular or nerve damage (IC = 1.2%, 95% CI 0.81-1.62), osteotitis of calcaneus (IC = 1.0% ,95% CI 0. 60-1.33), non-union (IC =0.2%, 95% CI = 0. 04-0. 39) , malreduetion (IC = 0. 1%) and painful implants (IC = 0.7% , 95% CI = 0.4-1.03) respectively. Conclusion The postoperative complications of calcaneus fracture are common clinical problems, to which professional care without delay can attain satisfactory outcome.

Objective To establish a clinical score system of giant cell tumors (GCT) according to its morphological features presented on three-dimensional (3D) computed tomographic imaging. Methods Sixteen patients with GCT around knee were included from January 2006 to March 2009. Of the tumors, 9 were located in the distal part of femur, and 7 were in proximal part of tibia. Each patient was exposed to spiral CT preoperatively. Then these primitive CT dates were inputted into digital Orthopedics clinical research platform. With 3D surfaces reconstruction and volume rendering, we reconstructed 3D morphology of GCT. The measurement index included pathological fracture, the degree of involvement of cortical bone, the volume of tumor, the distance between tumor and joint surface and the percentage of involvement areas of articular surface. On account of previous literature and above data, clinical score system of GCT was established. Its feasibility was testified by clinical data. Results A new clinical score system of GCT was established. It was named Hu-Chen Giant Cell Tumor Scale. Full score of the system was 12. In the 16 patients, 5patients whose points was more than 9 elevated by Hu-Chen Giant Cell Tumor Scale preoperatively were treated by wide excision and prosthetic replacement. The postoperative average MSTS score of 5 patients was 27, and there were no recurrence. The 5 patients whose points was 6-8 elevated by Hu-Chen Scale were treated by intralesional excision and structured allograft. The postoperative average MSTS score of the patients was 29, and 1 case underwent recurrence whose points was 8. The 6 patients whose points were less than 6 elevated by Hu-Chen Scale were treated by intralesional excision and morsellized allograft. The postoperative average MSTS score of the patients was 27, and there were no recurrence. Conclusion Hu-Chen Giant Cell Tumor Scale established based on digital techniques includes lots of factors which determined surgical strategy. The grating system is an effectively, reliable method in treatment of GCT.

[Objective] To research the plantar pressure distribution of the normal Chinese adult. [Method] The F-scan plantar pressure analysis system was used to collect plantar pressure distribution data of 100 volunteers who stand, walk, jog, go upstairs and downstairs.The plantar pressure distribution data of 5 kinds of physiological states, as well as influence of sex, height, body weight, body mass index and speed was analyzed. [Result] There's different characteristic between 5 kinds of states of the plantar pressure distribution in the Chinese normal adults. There's significant difference between static and dynamic. In four dynamic motions, the gait of walk was stalest, and it became unstable if speed up and go upstairs or downstairs. As for the influential factors of the plantar pressure distribution, there was non-significance of sex. But the speed had the significance. The height, the body weight, the BMI had weak correlation with the plantar pressure distribution. [Conclusion] The plantar pressure distribution of normal Chinese adults has the distinctive quality. The data obtained by this experiment, may provide the reference for the clinical plantar pressure analysis.

Objective To discuss the methods of the operative treatment for posterior tibial tendon dysfunction (PTTD). Methods From December 2002 to June 2005, 8 cases of PTTD were treated with operations, including 2 males and 6 females with an average age of 47 years (range, 36 to 56 years). Left side was involved in 6 cases, and right side was affected in 2 cases. Stage Ⅱposterior tibial tendon dysfunction were 2 feet and stage Ⅲ were 6 feet. Every case with special operative treatment, for instance lateral column lengthening, arthrodesis, repair posterior tibial tendon, spring ligament reefing, flexor digitorum longus tendon transfer and so on. Every bone operation was combined with one or more than one sofe tissue operation. Anterior transfer and strengthening of posterior tibial tendon were performed in 4 cases, spring ligament reefing in 2 cases, flexor digitorum longus tendon transfer in 4 cases. All patients were fixed with plaster cast at inversion position for 4-6 weeks, then changed to plaster splint fixing at neutral position for 4 weeks. Functions of ankle and foot were evaluated before and after operation. Results All patients were followed up for an average of 28 months(range, 12 to 40 months). According to Maryland foot score, 2 were fair and 6 were failure in preoperative, 4 were excellent, 3 were good and 1 was fair in postoperative. The total excellent and good rate was 87.5%. The specific index of X-ray improve obviously(P

[Objective]To discuss the operative treatment for adult flatfoot deformity with severe pain.[Method]From August 2002 to October 2004,operative treatment for 12 cases of unilateral adult flatfoot deformity with severe pain underwent operative treatment,which included 7 males and 5 females with an average age of 35 years(range,20 to 56 years),left side was involved in 8 cases,and right side was affected in 4 cases.According to etiological factor,stageⅡ~Ⅲ posterior tibial tendon dysfunction were 6 feet,congenital flatfoot were 3 feet,neurological flatfoot were 2 feet and postoperative equinovarus was 1 feet.Every case received special operative treatment,for instance lateral column lengthening,medial displacement calcaneal osteotomy,arthrodesis,repair posterior tibial tendon,sping ligament reefing,FDL tendon transfer and so on.All patients were fixed with plaster cast at inversion position for 4~6 weeks,then changed to plaster splint fixing at neutral position for 4 weeks.Functions of ankle and foot were evaluated before and after operation.[Result]All patients were followed up for an average of 22 months(ranged,16 to 28 months).The total excellent and good rate was 83.3% according to Marryland foot score.The specific index of X-ray improved obviously(P

Objective To establish a way to measure the injury severity of articular surface due to posterior malleolus fracture and investigate its clinical significance based on three-dimensional reconstruction technique.Methods Between May 2009 and March 2014,138 cases of peri-ankle injury combined with posterior malleolus fracture were treated.Lateral radiographs were reviewed to measure the ratio of posterior fragment area to distal tibial plafond area using the common method.Three-dimensional CT images were examined to measure ratio of the area of injury using the three-dimensional measuring method.Statistical comparison was made using the t-test and intraclass correlation coefficient (ICC).Results Measurement failed on 33 lateral radiographs and 13 three-dimensional CT images.Six cases cannot be measured by both imaging technology,so results of 98 cases were compared.Ratio of posterior fragment area to tibial plafond area was (16.2 ± 7.2) ％ measured by radiographs and was (29.6 ±10.1) ％ by three-dimensional CT scans (P ＜ 0.05).Three-dimensional CT measurements showed higher intra and inter-observer agreement (ICC of 0.973 to 0.942) than that in radiographic measurements (ICC of 0.875 to 0.860).Conclusion Three-dimension CT assessment of the extent of injury to articular surface because of posterior malleolus fracture is reliable and reproducible,but radiographic assessment may underestimate the injury and influence the choice of surgical indications.

BACKGROUND:The incidence of patel ar complications is decreasing, however, the necessity of patel ar replacement remains unclear. OBJECTIVE:To investigate the incidence rate of anterior knee pain and postoperative pain score in total knee arthroplasty without the patel ar replacement and to provide a reference for the formulation of clinical operation scheme. METHODS:151 patients with 193 knees receiving total knee arthroplasty were involved in this study. Al the patients were treated with patel ar forming but not resurfacing of the patel a. The Western Ontario and McMaster University (WOMAC) Osteoarthritis Index and America Hospital for Special Surgery (HSS) score were used to evaluate patients before surgery and at 6 and 12 months after surgery. The function of knee joint, the incidence rate of anterior knee pain and visual analogous scale score before and after operation were compared. RESULTS AND CONCLUSION:After 6 and 12 months of total knee arthroplasty, WOMAC osteoarthritis index was significantly lower and HSS score was significantly higher than those before surgery (P<0.05). At 12 months post-operation, the incidence rate of anterior knee pain was 11.3%, which was significantly lower than the preoperative rate (94.5%) (P<0.05). At 12 months post-surgery, visual analogous scale scores were also significantly lower than the preoperative score (P<0.05). Total knee replacement without resurfacing of the patel a can effectively improve knee joint function in knee osteoarthritis or rheumatoid arthritis patients, ameliorate the symptoms of anterior knee pain, has a good clinical effect within short term post-operation. The middle-and long-term effects need further exploration.

Objective To investigate the effect of sustentaculum tali screw placement on outcomes following open reduction and internal fixation (ORIF) of intraarticular calcaneal fractures.Methods A retrospective analysis was made on 139 patients with intraarticular calcaneal fractures treated by ORIF from April 2008 to January 2012.According to Sanders classification,there were 9 patients with type Ⅱ fractures,87 with type Ⅲ fractures and 43 with type Ⅳ fractures.Fracture reduction followed by placement of calcaneal anatomic plate or anatomic locking plate was performed via calcaneal lateral L-shape incision.All the patients received X-rays and CT scans within postoperative 2 weeks.Placement of screws in sustentaculum tail was detected by CT volume rendering to visualize implants combined with multiplanar reconstruction imaging (MPR).Patients were divided into accurate fixation group (Group A,n =28),marginal fixation group (Group B,n =58),and non-fixation group (Group C,n =53) based on radiological results.Intra-and peri-operative parameters,time to partial weight-bearing,time to full weight-bearing,fracture healing time,and clinical outcome were compared among groups.Functional outcome was assessed using American Orthopedic Foot and Ankle Society (AOFAS) Ankle Hindfoot Scale.Results Postoperative X-rays indicated accurate fixation of sustentaculum tail in 64 patients,marginal fixation in 22,and non-fixation in 53,but CT images manifested accurate fixation in 28 patients,marginal fixation in 58,and non-fixation in 53.Group A had operation duration of (93 ±11) min and intraoperative blood loss of (252 ± 27) ml,longer or higher than those in Group B [(85 ±8) min,(194±16) ml] and Group C [(57±6) min,(136 ±13) ml] (P＜O.05).There was no significant difference in mean hospital stay among the three groups (P ＞ 0.05).Ninety-two patients were followed-up for 12-38 months (mean 18.5 months) and 85 patients completed foot and ankle exercise as planned.Moreover,no significant differences were observed among groups concerning time to partial and full weight-bearing,fracture healing time and AOFAS score at the final follow-up (P ＞ 0.05).Conclusion Sustentaculum tali screw placement has no apparent effect on the short-term outcome of surgical treatment for calcaneal fractures.

Objective To investigate the establishment of secure tunnel in fixation for the talar neck fracture when screws were fixed from the medial wall of talus.Methods The age of volunteers was limited from 20 to 60 years old,and the height of male volunteers was from 165 to 185 centimeters,while the female volunteers' height was from 155 to 175 centimeters.The body mass index (BMI) was less than 25.The volunteers who were not heavy manual workers or standing working for long time had no history of ankle or foot fractures,and there were no evidence of degeneration changes in ankle joints according to X-ray.At last there were 33 males in this study with an average age of 43.7 (21-59) years and an average height of 176.0 (168-184) centimeters.There were 22 females with an average age of 43.2 (22-60) years and an average height of 165.4 (158-172) centimeters.After the volunteers' ankle joints and feet were scanned by CT,the reconstructed images were stored in CD and the slice thickness was 0.75 millimeters.The SuperImageTM Orthopedics Edition1.1 software was used to display the images and perform three dimensional reconstruction.The height of talar neck and the height of tarsal canal were measured.The models that screws passing into tarsal canals were built.The maximal length and angle that screws were inserted in the middle 1/3 and in the inferior 1/3 of medial wall of talus and run along to two directions were measured.At last,the data were analyzed with SPSS 13.0 software.Results The height of talar neck and tarsal canal had no significant difference between left side and right side in the same gender.The height of male talar neck was greater than the female' s.The models of screws passing into tarsal canals was gained.The length and angle in different insert points and different directions of screw fixation were also gained.When the screws were inserted from the middle 1/ 3 of the medial wall of talus,the angle of screw fixation was much wider than that when the screws were inserted from the inferior 1/ 3 of the medial wall of talus.At last,the safe range of the length and angel of screw fixation was calculated.Conclusion Damage of the blood of talus during internal fixation should be avoided.The middle 1/3 of the medial wall of talus is the most favourable choice to the fixation.Combining the digital technology with internal fixation for talar neck fracture could promote the operation' s security and feasibility.