Objective To evaluate the clinical results of minimally invasive plate osteosynthesis (MIPO) in treatment of complex fractures of the distal femur. Methads From July 2005 to December 2006, 41 patients with complex distal femur fractures induced by high energy trauma were treated with MIPO plus locking compression plate(LCP). There were 31 males and 10 females, at average age of 38 years(17-65 years). According to the AO/OTA fracture classification system, there were 11 patients with type A3 fractures, 22 with type C2 and 8 with type C3. There were 16 patients with open fractures. The clinical result was evaluated by using function examination and radiographic assessment. Results All patients were followed up for average 8 months(2-18 months), which showed fracture healing, with mean healing time of 13 weeks(7. 16 weeks). There was only 1 patient with superficial infection but no fixation failure or implant breakage were found. The average knee range of motion was 110°(45°-135°). Hospital for special surgery knee rating scale(HSS) showed excellent or good results in 36 patients (88%). No patient with greater than 5°difference in either varus or valgus was detected when compared 2 days after operation with latest follow-up. Conclusion In treatment of complex distal femur frac-tures, MIPO plus LCP have advantages of minor trauma, stable fLxation, slight interference on soft tis-sues, early fracture healing and few complications.

Objective To explore the effects of mini-traumatic operation in treatment of HIH. Methods A retrospective analysis of 140 patients with HIH was carried out,who were treated with mini-traumatic operation or only medicine.Results The mortality in operation group was 14.3%,and in medicine group was 34.3%.80% patients in operation group recovered well,and 52% patients in medicine group recovered well.Conclusion Mini-traumatic operation is more effective than only treated with medicine.Six to 48 hours after onset is a good period for mini-traumatic operation.

To evaluate the application of self-reinforced ploy-DL-lactide (SR-PDLLA) absorbable screws in the treatment of spongy bone and intra-articular fractures, the internal fixation with SR-PDLLA absorbable screw was performed on 58 cases,of which 25 were medial malleolus fractures, 14 condyle of humerus fractures, 9 tibial plateau fractures, 7 ulnar olecranon fractures, and 3 lateral malleolus fractures. Observations were made on the orthopaedic operation sites and overall conditions frequently and radiography was performed for periodic analysis. The results showed that SR-PDLLA absorbable screws were particularly effective and reliable, they had good biocompatibility in the treatment of spongy bone and intra-articular fractures and could be used safely in clinical practice.
Absorbable Implants ; Adolescent ; Adult ; Ankle Injuries ; surgery ; Bone Screws ; Child ; Female ; Fracture Fixation, Internal ; Fractures, Bone ; surgery ; Humans ; Humeral Fractures ; surgery ; Internal Fixators ; Lactic Acid ; chemistry ; Male ; Middle Aged ; Polyesters ; Polymers ; chemistry

We have designed a new kind of self-locking intramedullary nail for the treatment of unstable fracture of the middle and distal tibial shaft and have compared it with the interlocking nail by means of biomechanical experiments. The data could be used as a basis for clinical application. Fourteen formalin-fixed tibials of adults were made into unstable fracture models with a 2cm bone defect each. They were divided into 2 groups. Group 1 was fixed with self-locking intramedullary nail and group 2 was fixed by interlocking nail. All specimens were submitted to biomechanical test. The data were analysed by t test. The results showed there is no difference in anti-bending stiffness between the self-locking intramedullary nail and the interlocking nail. The anti-rotating and anti-compressing stiffness of interlocking nail is slightly better than that of self-locking intramedullary nail, but still the firmmess of the self-locking intramedullary nail in resisting rotation can meet the requirement of biological fixation. Its structure is reasonable, simple, practical, and it can resist certain harmful stress.
Biomechanical Phenomena ; Bone Nails ; Fracture Fixation, Intramedullary ; instrumentation ; Humans ; Tibial Fractures ; surgery

This study was sought to compare and evaluate the biomechanical properities of rotating-arm self-locking intramedullary nails (RSIN) with domestic femoral intramedullary nail (DFIN) in communited femoral shaft fractures. A 2 cm midshaft defect was created on seven pairs of cadaver femur, and fixed with two kinds of intramedullary nails. Then the torsion, four-point bending and axial loading to failure were tested on these models. The load versus deformation curve was generated from the load recorded by the load cell and the deformation simultaneously recorded by the linear variable displacement transducer. The mean torsional stiffness of the femora fixed with RSIN was 0.98 Nm/degree, which was significantly less than that fixed with the similar nails reported in documents, and the mean value of bending stiffness of the femur fixed with DFIN was larger than that of the femur fixed with RBIN, but there was no significant statistic difference. For use in fracture models under compression load beyond 1200 N, the RBIN was more rigid than DFIN, which provided the biggest load. All the parameters of the test with nails were greater than that for femur fixed with nails. In conclusion, FBIN probably provides enough strength and rigidity for use in communited femoral shaft fractures.
Adult ; Biomechanical Phenomena ; Bone Nails ; Female ; Femoral Fractures ; physiopathology ; surgery ; Fracture Fixation, Intramedullary ; instrumentation ; methods ; Humans ; In Vitro Techniques ; Male ; Random Allocation ; Stress, Mechanical ; Tensile Strength