ABSTRACT
BACKGROUND:The design of proximal femoral locking compression plate existed defects. Therefore, our team designed triangle truss locking plate with hyper-short arm according to proximal femoral locking compression plate (patent No. 201220051751.2). OBJECTIVE:To design and make triangle truss locking plate and evaluate its biomechanical properties. METHODS:Triangle truss locking plate with hyper-short arm was designed based on the support of two proximal screws of proximal femoral locking compression plate. Five pairs of fresh adult femur specimens were prepared, and the model of A3.1 (AO classification) reverse intertrochanteric fracture was established. Experimental group (right side) was fixed with triangle truss locking plate. Control group (left side) was fixed with proximal femoral locking compression plate. Stress distribution of the screws of proximal end of the plate, stress distribution of the fracture ends, the opening angle of fracture, and maximum load were detected. RESULTS AND CONCLUSION:(1) Stress distribution of the four screws of the proximal femoral locking compression plate was average in the experimental group, and the stress distribution of the two screws of triangle truss locking plate was close. Stress distribution of the four screws was not average in the control group. The proximal screw bearing stress was bigger in the control group than in the experimental group (P < 0.05). (2) Open angle under different loads were significantly smaler in the experimental group than in the control group (P < 0.05). (3) Maximum load was higher in the experimental group than in the control group (P < 0.05). Moreover, the position of damage was different between the two groups. The fixation in the experimental group was reasonable. These findings suggest that various biomechanic properties of the triangle truss locking plate with hyper-short arm were better than that of proximal femoral locking compression plate. Its fixation was reliable. Triangle truss locking plate could effectively reduce or avoid breakage of the plate and screw or coxa vara.
ABSTRACT
[Objective]To analyze the clinical effect of intertrochanteric fractures treated with percutaneous proximal femoral nails(PFN).[Method]From January 2004 to May 2009,PFN using percutaneous technique was performed in 180 elderly patients of femoral intertrochanteric fractures(180 hips,80 males and 98 females),with mean age of 76 years(range from 57-99 years).According to Evans classification,12 cases were type Ⅰ,28 were type Ⅱ,62 were Ⅲa,20 were Ⅲb,49 were Ⅳ,9 were Ⅴ.Traction table and C-arm fluroscopic intensifier were used with close reduction and interlocking during the course of operation.[Result]One hundred and seventy two cases in 180 patients were followed up for 8 to 21 months with a mean of 13.5 months.Other 8 patients were lost to follow up after discharge.Of 172 patients followed up,166 cases' radiographs showed the callus during 6-8 weeks postoperatively,while they had a full range of hip motion as the original level.Partial weight bearing exercises were carried out since the 8th postoperative week.The time of clinical fracture healing was from 12 to 16 weeks,the rate of healing was 98.8%.In the function assessment of 172 patients the satisfactory rate reached to 87.8 percents.[Conclusion]Percutaneous proximal femoral nails is an ideal way for the treatment of intertrochanteric fractures in aged because of its simple procedure,minimal invasion,less fluoroscopy exposures,less complications,stable fixation,early fracture healing and satisfied functional outcomes.
ABSTRACT
It has been over two decades from the discovery of extracorporeal shock wave(ESW).The therapy of ESW has been proved effective in improving fracture healing,and has been developed quickly both in the choice of indications and in the medical equipments research.The status quo of ESW research,application in orthpedic trauma and treatment mechanism are summarized in this paper.Successful cases are reviewd in treating post-traumatic nonunion,renovation of artificial joints,and traumatic osteonecrosis of the femoral head.Common complications and its preventive measures are given.Detailed description of ESW operating principles and selection of working parameters are also described,with the expectation of wider range of clinical applications of ESW.
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objective To analyze the causes of defective nonunion of femoral shaft and to evaluate interlocking intramedullary nails in treatment of shortened limb deformity following nonunion of femoral shaft. Methods 12 patients with shortened limb deformity following nonunion of femoral shaft were treated with autograft of ilium to fill up the defects and fixation by interlocking intramedullary nails. The patients were followed up for an average of 20 months. Results All the 12 patients healed by first intention after an average of 22 months. The limbs were lengthened averagely by 3.2cm. No failure occurred due to bent or broken major nails or intramedullary nails. Conclusions The main cause of shortened limb deformity following femoral shaft nonunion is bone resorption due to unreliable fixation. Interlocking intramedullary nails are an ideal device for shortened limb deformity following femoral shaft nonunion, though the union process is slow. In bone graft, care should be taken to avoid the complication of bone defect and weight bearing should be carried out some time later.
ABSTRACT
Objective To compare the results of different operative methods for old acromioclavicular dislocation. Methods Forty three patients with old acromioclavicular dislocation were treated with three different operative methods: 1)open reduction plus Kirschner wire fixation (9 cases); 2)open reduction plus reconstruction of acromioclavicular ligament (14 cases) and 3)open reduction plus modified Dewar s operation (20 cases). After surgery, the subjective symptoms of the arm, muscular contraction power, function of the shoulder joint and space of acromioclavicular joint in 43 cases were followed up for an average 4.8 years. Results The excellent results following three operative methods were seen in 33％ , 50％ and 74％ respectively. There was no significant difference between Kirschner wire fixation and reconstruction of acromioclavicular ligament (P > 0.05). Modified Dewar's operation was better compared with Kirschner wire fixation and reconstruction of acromioclavicular ligament (P< 0.05). Conclusion A satisfactory surgical procedure for treatment of old acromioclavicular dislocation should accomplish the following points: removal of scar tissue and intra articular cartilaginous fragments, reconstruction of joint stability and effective internal fixation until complete healing of the ligament structures.