Comparison between intermittent (spring-loaded) and continuous closed suction drainage of orthopedic wounds: a controlled clinical trial.

A randomized prospective trial of a continuous vacuum system (VariDyne) and an intermittent spring type system (Hemovac) was conducted in 126 consecutive orthopedic surgical wounds between February 1988 and October 1988 in which postoperative suction drainage was required. Comparison between the two groups showed a statistically significant difference among total drainage removed by the vacuum units and wound drainage into the dressing following drain removal. Hip and knee arthroplasty patients receiving continuous vacuum suction experienced a greater average drainage volume and better wound healing than those receiving the spring-loaded device. Overall, all wounds which utilized continuous vacuum drained less serosanguinous or serous fluid than those wounds utilizing the intermittent system following drain removal. A clear advantage to using a continuous vacuum suction device over an intermittent spring-loaded device is seen with respect to hematoma evacuation, wound drainage, wound healing, and possible complications.