Objective To discuss the clinic therapeutic effect of less invasive stabilization system (LISS) in treating distal femoral fracture and proximal tibial fracture.  Methods Twelve cases of fracture around knee joint applying LISS technology for treatment from March 2005 and May 2007 were retrospectively analyzed

including 7 cases of distal femoral fracture and 5 proximal tibial fracture. The patients

8 males and 4 females

were 24-27 years old (average 36.5). According to the AO/ASIF classification

4 cases were A2-type distal femoral fracture

2 C1-type and 1 C2-type; 2 cases were A2-type proximal tibial fracture

2 C1-type and 1 C2-type. All cases were fresh closed fractures. The time from injured to operation was 3-15 days (average 7.5 days). Except internal articular fracture was treated with limited open reduction

other fractures were treated with indirect reduction. LISS was implanted from minor incision extraperiosteally and locked with the lower percutaneous selfdrilling and selftapping cortical screw under the guider.  Results The average operation time was 58 min (40-90 min) and the average bleeding was 80 ml (60-120 ml). No bone grafting was required in all cases. The follow-up time was 6-18 months (average 11). All fractures recovered. The healing time under X-ray examination was 13.2 weeks in average (range from 11 to 24 weeks) and the full-load time was 12.7 weeks in average (8-20 weeks). No postoperative infection or screws loosening or failed fixation occurred. Joint surface reduction missing after reduction occurred in 1 case and its motion range of joint after operation was 96° to 120°. According to Johner evaluation standard: 7 cases achieved excellent outcome

4 good and 1 average.  Conclusion LISS can protect periosteum and the blood circulation at fracture site

and accelerate fracture healing and function recovery. LISS is an new effective method for complex fracture around knee joint.