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01924 908333

The complete multi-disciplinary referral service

01924 908333

The complete multi-disciplinary referral service

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Orthopaedic Surgery


Nick Blackburn


Orthopaedic Surgeon

Nick graduated from the RVC in 1998. He worked in small animal practices before joining Calder Vets in 2012. Nick gained his certificate in Small Animal Surgery in 2007 and is now an RCVS Advanced Practitioner in Small Animal Surgery.

Nick undertakes most aspects of surgery though is biased towards orthopaedic and spinal surgery. He has significant experience in canine and feline fracture management and traumatology. He currently performs total hip replacements in small patients (such as cats and toy breed dogs) and will expand this service to larger patients at Paragon Referrals.


Mark Tonzing

BVSc MANZCVS(Small Animal Surgery) MRCVS

Orthopaedic Surgeon

Mark Tonzing graduated with honours from the University of Melbourne in 1993. He pursued a career in surgery and in 2000 was duly admitted as a member of the ACVSc by examination in small animal surgery. He undertook specialist residency training in orthopaedics & spinal surgery at Willows Referral Service between 2002 and 2005 and has worked in specialist referral centres for ten years as an orthopaedic & neurosurgeon and five years operating a peripatetic orthopaedic service.

Mark has extensive experience in all aspects of canine and feline orthopaedics and spinal surgery, including significant experience in canine and feline hip replacement. His team performed the United Kingdom’s first feline total hip replacement, and subsequently the world's first bilateral feline total hip replacement.

Mark has contributed to and co-authored several scientific publications and in 2005 the British Veterinary Orthopaedic Association awarded him the Lesley Vaughan prize for original orthopaedic research. He has presented research at international scientific meetings and lectured to vets in the United Kingdom, continental Europe and Australia.