We analyzed 34 extension contracture of the knee patients after modified Judet's procedure. Male patient was 32 and female was 2. Age ranged from 19 years to 61 years average being 34 years old. Follow-up period ranged from 12 months to 7 years and 8 months average being 3 years 8 months. 1. The extension contracture of the knee were due to not only scarring of the vastus intermedius but contractures of quadriceps muscles, and finally did lead to intraarticular adhesion in all cases. 2. The results of modified Judet's procedure were excellent or good in 97% and we concluded that the modified Judet's procedure of quadricepsplasty was good method of treatment in extension contracture of the knee. 3. The extension lag after modified Judet's procedures was increased initially but overcame by physical therapy, and did not significantly increase even after release of rectus femoris. 4. Modified Judet's procedure was able to permit early physical therapy without any skin problem.