Fascicular tubulization: a cellular approach to peripheral nerve repair.

Present techniques of nerve repair by suture are based on an anatomical approach. The severed layers of connective tissue are reapproximated. Another approach to nerve repair is to separate the specific cellular components of the peripheral nerve that contribute to fibrous healing and nerve regeneration. The perineurium normally separates the extrafascicular epineurium of mesodermal origin from the intrafascicular endoneurium of ectodermal origin. A cellular approach to nerve repair would use a tube around the fascicle as an artificial perineurium to separate fibrous healing from axonal regeneration until the perineurium reestablishes its continuity. Fascicular tubulization with polyglycolic acid tubes was studied in 25 rats. The polyglycolic acid tube is resorbed after the perineurium has reestablished its continuity. The repairs by fascicular tubulization demonstrated improved organization of the repair site compared to suture repairs. The diameter histograms of the regenerated myelinated axons were similar in repairs by tube and suture techniques. The total regenerated cross-sectional area of the myelinated axons was similar in the repairs by fascicular tubulization to repairs by fascicular suture.