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The analgesic effects of peripheral nerve blocks can be prolonged with the placement of perineural catheters allowing repeated injections of local anaesthetics in humans. The objectives of this study were to evaluate the clinical suitability of a perineural coiled catheter ( PCC ) at the sciatic nerve and to evaluate pain during the early post‐operative period in dogs after tibial plateau levelling osteotomy. Pre‐operatively, a combined block of the sciatic and the femoral nerves was performed under sonographic guidance (ropivacaine 0.5%; 0.3 mL kg −1  per nerve). Thereafter, a  PCC  was placed near the sciatic nerve. Carprofen (4 mg kg −1  intravenously) was administered at the end of anaesthesia. After surgery, all dogs were randomly assigned to receive four injections of ropivacaine (group R; 0.25%, 0.3 mL kg −1 ) or NaCl 0.9% (group C; 0.3 mL kg −1 ) every 6 h through the  PCC . Pain was assessed by use of a visual analogue scale (VAS) and a multi‐dimensional pain score (4Avet) before surgery (T‐1), for 390 min (T0, T30, T60, T120, T180, T240, T300, T360 and T390) as well as 1 day after surgery (Day 1). Methadone (0.1 mg kg −1 ) was administered each time the  VAS  was ≥40 mm or the 4Avet was ≥5. At T390 dogs received buprenorphine (0.02 mg kg −1 ). Data were compared using Mann–Whitney rank sum tests and repeated measures analysis of variance. Regardless of group allocation, 55% of dogs required methadone.  VAS  was significantly lower at T390 ( P  =   0.003), and at Day 1 ( P  =   0.002) and so was 4Avet at Day 1 ( P  =   0.012) in group R than in group C. Bleeding occurred in one dog at  PCC  placement and  PCC  dislodged six times of 47  PCCs  placed. Minor complications occurred with  PCC  but allowed four repeated administrations of ropivacaine or saline over 24 h in 91.5% of the cases.

Use of a perineural coiled catheter at the sciatic nerve in dogs after tibial plateau levelling osteotomy – preliminary observations