Curve running is a common form of training and competition. Conducting research on posture estimation during curve running can provide more accurate training and competition data for athletes. However, due to the unique nature of curve running, traditional posture estimation methods neglect the temporal changes in athlete posture, resulting in a decrease in estimation accuracy. Therefore, a posture estimation method for curve running motion using nano-biosensor and machine learning is proposed. First, the motion parameters of humans are collected by nano-biosensor, and the posture coordinates are obtained preliminarily. Second, the posture coordinates are established according to the human motion parameters, and the curve running posture data is obtained and filtered to obtain more accurate data. Finally, the Bayesian network in machine learning is used to continuously track the posture, and a nonlinear equation is established to fuse the posture angle obtained by the sensor and the posture tracked by the Bayesian network, to realize the posture estimation of curve running motion. The results show that the proposed estimation method has a good motion posture estimation effect, and the hip joint estimation error, knee joint estimation error and ankle joint estimation error are all less than 5°, and the endpoint displacement estimation offset rate is less than 2%. It can realize accurate motion posture estimation of curve running motion, and has important application value in the field of track training.
In order to develop stable differentiation model of preadiocytes,this paper studied the culture and differentiation of HPA-v(human preadiocytes).The results show that the latent period was two days,log phase occurred at the 3rd day and Stationary phase the 5th.The differentiation process was detected by inverted microscope,Oil Red O staining and GPDH activity measurement.The results showed that the differentiation appeared at the 3rd day,the intracytoplasmic lipids increased along with the differentiation time,and GPDH activity shared the same regularity which increased quickly at the 3rd day.The maximum value of intracytoplasmic lipids and GPDH activity was achieved at the 12th day and maintained high level.
Abstract Background Os acromiale can be potentially missed or misdiagnosed as acromion fracture, and this can affect treatment determination if it is complicated with an ipsilateral shoulder injury. The clavicle hook plate is a widely used technique for distal clavicle injuries, leading to transacromial erosion, particularly when in the presence of os acromiale. Case presentation A 70-year-old man and a 78-year-old man who had limited mobility and severe pain in their right shoulders following falls attended the emergency center. Both patients were diagnosed with os acromiale with CT or MRI and acute distal clavicle fracture or acromioclavicular joint dislocation. Following a comprehensive evaluation, os acromiale may limit the application of a clavicle hook plate due to potential transacromial erosion. The distal clavicle fracture with ipsilateral os acromiale received treatment with a volar radius locking T plate, and the acromioclavicular joint dislocation with ipsilateral os acromiale was reconstructed using suture anchors. Both yielded satisfactory outcomes and voided transacromial erosion. Conclusions Ipsilateral os acromiale may be a relative contraindication to the clavicle hook plate. An axillary lateral radiograph is recommended to detect potential os acromiale in patients using a hook plate.
Three-dimensional (3D) biomodels are essential for clinical orthopaedics. In this study, in order to improve the outcomes of orthopaedic surgical intervention and its clinical medical education, an advanced computer-based rapid prototyping (RP) biomodelling technique was used to fabricate 3D real size physical models of complex cases including highly difficult fractures and severe bone and joint deformities. As a result, the RP-produced vivid models made great contributions to achievement of much better understanding and preoperative planning for complex orthopaedic cases. On the other hand, outcomes of clinical medical education for orthopaedic residents and junior doctors were improved.
Objective To evaluate the technique and clinical outcomes of supra-acetabular external fixation in treating pelvic fractures associated with injuries of abdominal organs.Methods There were 17 cases of pelvic fractures associated with injuries of abdominal organs.Nine were males and 8 were females,with the average age of 42 years (range,21-75 years).The injury was caused by traffic accident in 9 cases,fall-down from height in 4,and crush by heavy objects in 6.According to Tile classification of pelvic fractures,7 were type B1,3 were type B2,2 were type B3,4 were type C1 and 1 was type C2.Fifteen cases suffered with hemorrhagic shock,2 with perineal injury and 12 with fractures of the limbs.All patients were treated with supra-acetabular external fixation and the outcomes were evaluated by Cole's clinical scoring,Matta and Tornetta's radiographic standards.Results All 17 cases were followed up with the mean period of 6.5 months (range,2-18 months).The average time of operation was 15 min (range,9-25 min).The mean blood loss was 17 ml (range,5-25 ml).All fractures healed and the mean healing period was 9.2 weeks (range,8-12 weeks).Three had transient palsy of lateral femoral cutaneous nerve.Five had soft tissue infection while the bony structures were not involved.According to Cole's scoring for pelvic fractures,15 cases were excellent,1 case was good and 1 case was fair,with the good-excellent rate of 94.12％.According to Matta and Tornetta's standards of fracture reduction,12 were excellent,3 were good and 2 were fair,with the good-excellent rate of 88.24％.Conclusion Supra-acetabular external fixation is a minimal invasive and convenient method for treating pelvic fractures with abdominal organs injury which is mechanically stronger than traditional external fixation via iliac crest.
Key words:
Pelvis; Fractures, bone; External fixators
Objective To investigate the therapeutic effect of Meta-nailing for tibial fractures via the supra-patellar approach.Methods Eighteen patients,11 males and 7 females,were enrolled in this study who had been treated in our department from September 2011 to November 2012 for tibial metaphyseal or segmental fracture.Their average age was 39 years (range,20 to 58 years).All the fractures were closed unilateral ones which were treated with closed reduction and internal fixation with TRIGENTM META-NAILTM via the supra-patellar approach.Muscular strength training and functional exercise without weight bearing commenced 3 days postoperatively.Results The average operating time was 70.6 minutes (range,60 to 90 minutes).No postoperative complications like infection,embolism or necrosis occurred.The patients were followed up regularly with a mean time of 8.5 months (range,6 to 10 months).Bony callus was shown on X-ray films 6 weeks postoperation on average.No nonunion,infection or osteomyelitis was observed.Partial atrophy of the calf occurred in 4 cases (from 0.4 to 0.8 cm).There was no complaint of anterior knee pain among all the patients.The pain scores in Lysholm knee scoring system ranged from 21 to 25 points (average,23.8 points) and the total scores ranged from 82 to 93 points (average,89 points).Conclusions As a mini-invasive method,Meta-nailing via the supra-patellar approach is superior to traditional tibial nailing because of its simplicity in reduction and fixation for tibial segmental and metaphyseal fractures.It can be an effective option for special types of tibial fracture.
Key words:
Tibia; Fracture; Fracture fixation, internal; Bone nails; Supra-patellar approach
Implant failure is a disastrous complication of the operative treatment of midshaft clavicle fractures, and improving the osteosynthesis plate is a strategy for preventing this. We aimed to investigate whether canceling the notch and adding screw-hole inserts enhanced the mechanical properties of the plate.A clavicle model was generated based on the CT images of six adult volunteers (age range, 20-40 years; three males and three females; height range 160-175) using dedicated software, and a midshaft fracture model was created. The domestically made seven-hole locking plate commonly used for midshaft clavicle fractures was simulated (Model I); modifications were made to the plate (Model II). Using 3D finite element analysis, we simulated the fracture construct under three different load conditions-downward cantilever bending, axial compression, and axial torsion-and compared the stress distribution.We found that under axial compression, Model II experienced its maximum stress on the plate at 551.9MPa, which was less than that in Model I (790.4 MPa). Moreover, a greater stress concentration at the fracture site was observed under axial torsion, despite the maximum stress of both the models being similar.Canceling the notch and filling the screw holes near the fracture can ameliorate stress concentration on the internal fixation construct and enhance its reliability under axial compression. This improvement has substantial effects on the mechanical properties of implants and potentially prevents implant failure. Modern osteosynthesis anatomical implants need to be improved.
Using Navier-Stokes function and the continuity principle of mass, a set of mathematical model is established for the developing flow in the artery under unsteady condition in this paper. And then the solution is obtained by applying the method of Bessel function for this mathematical model. A set of formulas of velocity distribution and pressure distribution is derived. The comparisons between both pressure distributions of developing arterial blood flow in the steady and in the unsteady condition are determined. The analysis indicates that the distinction of pressure distribution for the steady and that for the unsteady condition is quire large.
Object: To find out near-optimal compression waveforms for electro ventilation double pump cardiopulmonary resuscitation (EDCPR), a Cardiopulmonary resuscitation (CPR) technique, performed on a mathematical circulatory system model. Method: At first, a mathematical circulatory system model was established. Second, the hemodynamic effects of EDCPR to the circulatory system model were performed. Third, a sequential lower limb compression pressure (LLCP) coupled with chest compression-decompression was performed. Results: The proper value and the time sequence of the LLCP were found. And they were in accordance with the results of parallel animal experiments and the data published before. Conclusion: Chest compression-decompression coupled with a sequential LLCP could improve the aortic pressure and myocardial perfusion pressure better than current CPR technique, during cardiac arrest.
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