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conventional technique.The hypothesis was a difference < 2° between the 2 techniquesThe measured parameters were :HKS, HKA, tibial slope, femoral rotation on CTDuration , bleeding, pain on VAS and morphine consumption, active flexion, KSS, Oxfordscore , recovery of independant walking and delay of return to home.Both groups were identical for gender, age, BMI, etiology, comorbidities, pain andrehabilitation protocols.Results :There were no significant differences on HKA, HKS angles, femoral rotation, active flexion,pain, length of hospital stay.The surgery with the patient specific instruments was 10 minutes shorter than the conventionalone( p < 0,05) and the bleeding was inferior with a ratio of 1/3 ( p=0,02).There were no complications with this technique and the use of the conventional guides werenever necessary with the patient specific instrumentation.Discussion and ConclusionThe patient specific instrumentation for TKA has a precision identical to that of theconventional technique, including for femoral rotation and ligament balance.The advantages of this method are :Reduced per and post operative bleedingShortening of the operative procedureIt is reproducible, including for less experimented surgeons and allows teaching and assistancein a lower technological institution.The number of implant sizes is much inferior (2/9) just as the quantity of instruments to besterilised.These advantages induce a cost reduction which could be inferior to the price of the procedure.Thursday, October 7, 2010, 15:40-16:00Session A7: Hip 2Hip Arthroscopy and Body Temperaturefile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]