Our Services

TSAS was established to provide a specialist referral surgical service for New Zealand Veterinarians and their clients. Our surgeon accepts cases for both diagnostic evaluations and for surgical treatment. We are also able to offer diagnostics via access to digital radiography, ultrasound, CT and MRI.

We accept small animal patients (usually cats and dogs) that require diagnosis and treatment of lameness, neurological / spinal conditions, cancer, fractures, air-way, skin grafting, orthopaedics and soft tissue surgery. We do not perform surgical procedures for cosmetic reasons, and do not normally accept cases for dentistry or routine de-sexing. On rare occasions, we will perform de-sexing surgery on pets that are deemed a very high anaesthetic risk, if this is prompted by their referring veterinarian.

We aim to work closely with both the pet-owner and their regular veterinarian to provide advanced treatment with the patients best interests at heart. In many cases our patients are referred from distant centres, thus we find good communication with all involved parties is critical in achieving a successful outcome. For more information about these services, talk to your veterinarian, or contact us by phone, fax or email, details below.


There are a number of osteotomy surgeries now available to treat cranial cruciate ligament injuries in the dog. In Dr Ruth’s opinion it is best to have an assessment (and surgery) with a veterinarian who is qualified and registered as a specialist in small animal surgery to decide on the best surgical option for each dog.

Dr Ruth of The Small Animal Surgeon offers:

Tibial Plateau Levelling Osteotomy (TPLO)

Triple Tibial Osteotomy (TTO)

Extracapsular Stabilisation

Ossability Tibial Tuberosity Advancement (OTTA)

Tibial Wedge Osteotomy (TWO)

Depending on the tibial plateau slope (on x-rays), the dog's weight and athleticism, the dog's temperament and ability to tolerate cage rest, and many other factors! The Ossability TTA is very similar to the MMP but only some patients fit the criteria for these surgeries based on their x-rays prior to surgery. We normally do our measurement x-rays at east 1-2 days before surgery & dog's stay 2 nights post-op. We are happy of course to have him / her for 7 – 10 days at the clinic if needs be.

We would very much like to help, but would need to see your dog, confirm the diagnosis, get our own x-rays for some geometrical measurements, and then give advice as to the best surgical option. Please let us know if we can help