Background: Tibial plateau levelling osteotomy (TPLO) is commonly used to manage cranial cruciate ligament (CrCL) disease. The use of a spherical osteotomy blade (S-TPLO) enables correction of some tibial deformities with three rotational degrees of freedom. Methods: As a proof of concept, this retrospective study included 45 dogs with CrCL disease that were treated with an S-TPLO. The tibial plateau angle (TPA) was measured preoperatively, immediately after surgery (pTPA 0 ) and on postoperative days 42 (pTPA 42 ) and 56 (pTPA 56 ). Lameness and osteotomy healing were assessed until 56 days postoperatively.Results: Thirty-one dogs had complete CrCL ruptures, and 14 dogs had partial ruptures. Thirty-one dogs had medial meniscal damage. The mean TPA, pTPA 0 , pTPA 42 and pTPA 56 were 26.0 • , 7.8 • , 8.5 • and 8.9 • , respectively. The TPA from post-op to follow-up did not vary significantly (p > 1.365). Minor complications occurred in five dogs. The mean lameness score improved significantly from 3.2 preoperatively to 0.9 on day 56 (p < 0.0001). The mean healing score improved significantly from 1.6 on day 42 to 2.2 on day 56 (p < 0.001). Conclusion: S-TPLO was successful in treating CrCL disease in stifle joints without tibial deformities, with results comparable to previously reported TPLO outcomes.
A 9-year-old, neutered, male, Cairn Terrier dog presented with a 3-year history of progressive pain and lameness of the right hindlimb. After an acute episode of severe pain and non-weight-bearing lameness, the dog was referred to our clinic for evaluation. The physical examination was unremarkable; the orthopaedic examination revealed a positive cranial drawer sign and medial patellar luxation grade 3/4. Orthogonal radiographs were taken. Chronic degenerative changes consistent with cranial cruciate ligament insufficiency and medial patellar luxation were noted. Preoperative planning was performed using veterinary preoperative planning software. A spherical osteotomy was performed to level the tibial plateau, correct the medial patellar luxation and improve a valgus deformity. The osteotomy was stabilised using a polyaxial 2.0 tibial plateau levelling osteotomy plate. At the 8-week postoperative follow-up examination, the dog had normal weight-bearing ability without evidence of lameness or pain.
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