Is closed-suction drain necessary in unicompartmental knee replacement? A prospective randomised study

In a prospective randomised trial we evaluated the use of a post-operative closed-suction drain in unicompartmental knee replacement (UKR). Seventy-eight patients were divided into two groups: one without a post-operative closed-suction drain (Group A) and one with a drain (Group B). Both groups were matched for age, sex and pre-operative haemoglobin. In group A we observed a lower day one post-operative analgesic requirement, smaller knee circumference 3 days post-operatively and less local wound complications. Drain usage in UKR resulted in no significant advantage in post-operative pain, range of motion and hospital stay. Post-operative drainage does, however, increase the cost of the procedure both in labour and equipment expenditure. No deep infections occurred in either group during the follow-up period. We conclude that avoiding post-operative closed-suction drainage in UKR does not influence the outcome.