[Contribution of external valves in skin expansion].

The filling period is a delicate phase of skin expansion procedures. Many of these difficulties are due to problems encountered during puncture of the valves when they are buried in the skin (pain, leaks, loss of the valve, inverted valve). The authors report their experience of the use of external filling valves. Based on a series of 68 valves, they describe the implantation technique, indications and their results.