Morphologic impact of four surgical techniques to correct excessive tibial plateau angle in dogs: A theoretical radiographic analysis.

OBJECTIVE: To determine morphologic differences between four tibial osteotomy techniques used to correct excessive tibial plateau angle (eTPA). STUDY DESIGN: Retrospective radiographic analysis. SAMPLE POPULATION: Sixteen dogs (27 tibias) with eTPA. METHODS: Virtual corrections of eTPA were performed on sagittal plane radiographs of canine tibia using four tibial osteotomy techniques and categorized into respective groups. Group A represented the center of rotation of angulation (CORA)-based leveling osteotomy (CBLO) and coplanar cranial closing wedge ostectomy (CCWO), Group B the tibial plateau leveling osteotomy (TPLO) and CCWO, Group C the modified CCWO (mCCWO), and Group D the proximal tibial neutral wedge osteotomy (PTNWO). Pre- and post-correction TPA, tibial length and mechanical cranial distal tibial angle (mCrDTA) were measured and compared. RESULTS: Mean TPA prior to correction was 42.67 ± 6.1°. Post-correction mean TPAs were 10.47 ± 2.1°, 6.77 ± 1.6°, 4.76 ± 1.5°, and 7.09 ± 1.3° for Groups A, B, C, and D, respectively. TPA correction accuracy in Groups A and D varied least from target TPAs. Tibial shortening was documented in Group B in contrast to other groups. The greatest mechanical axis shift was identified in Group A. CONCLUSION: Each technique achieved TPA < 14° despite having different effects on tibial morphology including alteration of tibial length, mechanical axis shift and variation in correctional accuracy. CLINICAL SIGNIFICANCE: Despite all methods being able to correct eTPA, the choice of technique will affect morphology in unique ways and should be considered prior to surgery to consider the implications in a given patient.

Outcomes of 43 small breed dogs treated for splenic hemangiosarcoma.

OBJECTIVE: To determine outcome and prognostic factors in small breed dogs in which hemangiosarcoma was diagnosed and whether outcomes differed between small and large breed dogs with splenic hemangiosarcoma. STUDY DESIGN: Bi-institutional retrospective study. ANIMALS: Forty-three small breed (<20 kg) and 94 large breed client-owned dogs. METHODS: Medical records were reviewed to identify dogs treated with splenectomy for splenic hemangiosarcoma. Data acquired included signalment, preoperative staging, bloodwork results, surgical findings, histopathologic findings, administration of chemotherapy, presence/absence of metastatic disease, and survival time (ST). Cox proportional hazards regression analysis was performed to assess prognostic factors associated with survival. RESULTS: The overall median ST was 116 days and 97 days for small and large breed dogs, respectively. The ST for dogs treated with surgery and chemotherapy was 207 and 139 days for small and large breed dogs, respectively. The disease-free interval (DFI) was 446 and 80 days for small and large breed dogs, respectively. Dog size was associated with DFI (P = .02) but not with ST (P = .09). The presence of metastasis at diagnosis was associated with decreased ST in small (P = .03) and large (P = .0009) breed dogs. Administration of chemotherapy (P = .02) was associated with increased ST (P = .02) in small breed dogs. CONCLUSION: The ST was not different in small and large breed dogs with splenic hemangiosarcoma treated with splenectomy and chemotherapy. CLINICAL SIGNIFICANCE: Prognosis remains poor despite aggressive therapies in small and large breed dogs.