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The aim of this study was to investigate range of motion (ROM) gained by mobile-bearing (MB) and cruciate-retaining (CR) knee prostheses in the early postoperative period with a view to determining which of the two accomplishes its goal sooner, assuming no significant differences in long-term outcomes.A retrospective cohort study was performed comparing outcomes in the early postoperative period. Ninety-two CR designs were compared with 100 MB designs, over a follow-up period of 1 yr. Knees were evaluated at discharge and at 1, 3, and 6 mo, as well as at 1-year postoperatively using ROM and the Knee Society Score (KSS) as the main variables.Both groups were equivalent in terms of gender, age, body mass index, ROM, and KSS at baseline. Results showed that ROM values improved significantly faster in the MB group at 1 and 3 mo after discharge as compared to the CR group, even though differences between both groups tended to even out with time. Both groups showed a significant improvement in KSS values 6 mo after discharge with significant differences in the final values, although the improvement was more substantial in the MB group.The MB group showed a faster recovery after total knee arthroplasty, as compared with the CR group, even though both groups tended to converge over time. The results obtained could allow a reduction in rehabilitation time and an early return to normal activities.