Fig. 2

Quantitative thermal detection and pain thresholds [cold in blue (columns 1, 3, 5 and 7) and heat in red (columns 2, 4, 6 and 8)], in the symptomatic (right) and uninjured (left) side, one month before (upper graphs) and 2 months after surgery (bottom graphs). The mean thresholds were calculated as the average value of five consecutive trials. Before surgery, both the cold and the heat detection thresholds were increased on the symptomatic side (20.4 and 46.6°C, respectively) in comparison with the uninjured side (29.8 and 34.4°C, respectively). After surgery, the thermal detection thresholds were normalized on the symptomatic side (29.8 and 35.3°C, respectively) and similar to the uninjured side (30.2 and 34.1°C). Normal values of cold and heat detection thresholds usually range between 29.3–32°C and 32–42.6°C, respectively. Pre- and post-operative pain thermal thresholds were normal, confirming the absence of thermal allodynia (color in online)