The effectiveness of alternate flexion and extension splint(splint group) in restoring the range of motion(ROM) following total knee arthroplasty(TKA) was evaluated, comparing with the continuous passive motion(CPM) group. One hundred and twenty knees of 87 patients(21–80 years old:12 males & 75 females) who were followed for 2.7 years(ranging from 1.2 to 5.3 years) were involved in this study. The ROM of following groups were compared each other and the results were analyzed statistically with Wilcoxon rank sum test and the differences between each prosthesis were compared with Kruskal-Wallis test. 1) Splint(51 knees, 42.5%) v.s CPM group(69 knees, 57.5%) 2) RA(43 knees, 35.8%) v.s. OA(77 knees, 64.2%) 3) Various types of prosthesis(PSCK, PCA, Tricon-M, M/G, Oxford Knee, PFC) The results were as follws:1. The ROM of splint group(average 132.2°, ranging from 85–145°) was significantly greater than that of CPM group(average 110.5°, ranging from 50–140°)(p<0.01). 2. The ROM of osteoarthritic knees(average 122.2°) was slightly greater than that of rheumatoid knees(average 115.8°) without statistical significance(p) 0.05). 3. There was statistically significant difference between ROM of the various types of implant(p < 0.01). However this difference seemed due to different methods of rehabilitation rather than different types of prosthesis. From this result it is suggested that the alternate flexion and extension splint following TKA is a useful method in restoring ROM, comparing to gradual ROM exercise with CPM.