Effects of hyaluronic acid-carboxymethylcellulose membrane on extraneural adhesion formation and peripheral nerve regeneration.

The goal of nerve repair in the peripheral nervous system is to increase the number of axons passing from proximal to distal stump, and to enable the regenerated axons to reach the end organ as soon as possible. In the present study, the effect of the membrane formed by a mixture of hyaluronic acid and carboxymethylcellulose (HA-CMC) on nerve regeneration and perineurial scar formation was investigated. Eighteen New Zealand rabbits were allocated into control (n = 9) and experimental groups (n = 9). In the control group, conventional nerve repair was carried out following the transection of the sciatic nerve, while in the experimental group, following repair of the nerve, the repair line was covered by HA-CMC membrane extending 1 cm beyond the distal and proximal ends. Nerve regeneration and extraneurial adhesion formation were compared between the two groups 3 months later. It was observed that adhesion in the surrounding tissues was significantly less in the experimental group than in the control group. Furthermore, morphometric analysis of specimens obtained from the distal parts of nerves showed that the number of axons with myelin was higher in the experimental group than in the control group, with a statistically significant difference. Histologic sections obtained from the nerve repair line demonstrated that extraneural and intraneural fibrosis was significantly lower in the experimental group. It was concluded that HA-CMC membrane had a favorable effect on nerve regeneration, as well as extraneural scar formation, encouraging the clinical application of HA-CMC following nerve injuries.