FIG. 6.

Avulsion of T13 + L1 dorsal roots creates a more robust mechanical allodynia profile than rhizotomy of the same roots. Following baseline assessment of the response to calibrated von Frey filaments, the rats underwent avulsion surgery or rhizotomy surgery. Avulsion of the T13 + L1 dorsal roots induced more robust below-level bilateral mechanical allodynia than did rhizotomy (n = 8 per group; A, ipsilateral; B, contralateral; *p < 0.05 compared to sham animals; + p < 0.05 compared to rhizotomy).