Today's Veterinary Practice

JUL-AUG 2012

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JOURNAL CLUB Collection of Commentaries on Veterinary, Medical, & Related Literature ORTHOPEDIC SURGERY Effect of Tibial Plateau Leveling Osteotomy on Femorotibial Subluxation: In Vivo Analysis During Standing ,JN 4& -FXJT %% 1P[[J " Veterinary Surgery 2012; 41:465-470. The tibial plateau leveling osteotomy (TPLO) procedure has become widely accepted as a successful technique in treatment of cranial cruciate ligament rupture (CCLR) despite the technical demands of the procedure and potential for complications. Cadaveric models have shown that TPLO mitigates the cranial tibial subluxation that results from CCLR, thereby stabilizing the stifle. The purpose of this study was to assess the effect of TPLO on femorotibial subluxation during standing in dogs with CCLR. Fifteen dogs with naturally occurring CCLR underwent TPLO and were examined 1, 3, and 6 months postop- eratively with non–weight-bearing and standing radiographs and force-platform analysis. The radiographic distance between the origin and insertion of the CCL was measured and used to document the degree of cranial tibial luxation. Five of the 15 dogs had asymptomatic persistent cranial tibial subluxation at 2 or more postoperative evaluations; 4 of those dogs had required hemimeniscectomy at the time of TPLO surgery. The authors concluded that when the medial menis- cus was intact, the TPLO procedure alleviated cranial tibial subluxation as seen on standing radiographs; however, if the meniscus was torn, requiring hemimeniscectomy, postopera- tive subluxation was not entirely prevented by the procedure. %FTQJUF UIF QSFTFODF PG QFSTJTUFOU TVCMVYBUJPO JO TPNF EPHT BMM that underwent TPLO had resolution of their lameness. CRITICAL POINTS r *O UIJT TNBMM QPQVMBUJPO 51-0 EJE OPU NJUJHBUF all tibial subluxation in the CCL-deficient stifle. r 5IF NFEJBM NFOJTDVT JT BO JNQPSUBOU component in counteracting tibial subluxation. r 51-0 BMMFWJBUFE $$-3 SFMBUFE MBNFOFTT despite not always alleviating tibial subluxation. Derek B. Fox, DVM, PhD, Diplomate ACVS (Small Animal Orthopedic Surgery), University of Missouri SMALL MAMMAL MEDICINE Thymomas in Rabbits: Clinical Evaluation, Diagnosis, and Treatment Kunzel F, Hittmair KM, Hassan J, et al. Journal of the American Animal Hospital Association 2012; 48(2):97-104. Thymoma is a sporadically appearing disease in rabbits; clinical signs include increased respiratory effort and dyspnea, exercise intolerance, and bilateral exophthal- mos. This retrospective study compiled the clinical features of 13 pet rabbits with mediastinal masses, all of which were confirmed to be thymoma. Treatment options for these rabbits included euthanasia, supportive care, and thoracotomy. Of 7 rabbits undergoing thoracotomy, survival time was 3 days or less in 5 cases. The remaining cases reported survival times of 955 and 180 days. Supportive therapy in 2 rabbits consisted of aspiration of a mass-associated cyst in both animals, with the addition of prednisone in 1 case. Survival times were reported as 150 and 270 days, respectively. None of the rabbits were treated with radiation therapy, which has been reported as a potentially useful option. CRITICAL POINTS r 3BCCJUT XJUI B NFEJBTUJOBM NBTT BSF NVDI more likely to have a thymoma than mediastinal lymphosarcoma. r %ZTQOFB XBT UIF NPTU DPNNPO DMJOJDBM TJHO occurring in 76.9% of rabbits with thymoma. r #JMBUFSBM FYPQIUIBMNPT B DPNNPOMZ SFQPSUFE clinical sign, only appeared in 46.2% of rabbits with thymoma. r $ZUPMPHJD FYBNJOBUJPO PG VMUSBTPVOE HVJEFE samples appeared to be an accurate diagnostic tool for thymoma in rabbits. r 8IJMF UIPSBDPUPNZ BOE NBTT SFNPWBM IBWF been reported, short-term survival rate for this procedure in this group of rabbits was low (5 of 7 rabbits died within 3 days of thoracotomy). Angela M. Lennox, DVM, Diplomate ABVP (Avian), Avian and Exotic Animal Clinic of Indianapolis July/August 2012 Today's Veterinary Practice 85

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