Objectives Medial patellar luxation (MPL) is the most common developmental cause of hindlimb lameness in cats. The association between femoral and tibial conformation and MPL measured on computed tomography (CT) has not been reported in cats. The aims were to report femoral and tibial conformation in cats with and without MPL and to report normal femoral and tibial angles. Methods Angle of inclination of femoral neck (AI), anatomical lateral distal femoral angle (aLDFA), femoral trochanteric angle (FCT), angle of anteversion of femoral neck (AA), distal and proximal anteversion angle (DAA/PAA), overall tibial valgus (TV), tibial torsion (TT), tibial tuberosity displacement (TTD) and trochlear depth:patellar thickness ratio (T:P) were measured by three observers on CT of cats with and without MPL. Comparisons were made between groups. Inter-observer intraclass correlation coefficient (ICC) was calculated. Results Sixteen cats were recruited: eight control and eight with MPL. The aLDFA, PAA, TT, TTD and T:P were significantly less in cats with high-grade MPL. The AI, FCT, AA, DAA and TV were not significantly different. A high correlation was shown with inter-observer ICC in 33.33% and good correlation in 26.67% when comparing measurements between observers. Clinical Significance This study suggests that cats with high-grade MPL have decreased TT, TTD and T:P and may require tibial tuberosity transposition and femoral trochleoplasty. The PAA, TT and aLDFA were decreased, although clinical significance may vary and these cats may not require correctional osteotomies. Results should be interpreted with caution as high/good levels of inter-observer ICC occurred in less than two-thirds of cases between observers.

Objective The aim of this study was to report the outcome and complications of surgical stabilization following fracture of the supraglenoid tubercle in dogs. Materials and Methods Data from three referral centres (Queen Mother Hospital for Animals, Michigan State University and Veterinary Referral Hospital Hallam) were reviewed retrospectively for cases of supraglenoid tubercle fracture (n = 12). Results Overall success rate was 9/12. Major complication rate was 2/12 and minor complication rate was 9/12. All fractures that had major complications were comminuted. Methods of stabilization included pin and tension band wire (n = 5), lag screw (n = 2), plate fixation (n = 2), fragment removal (n = 2) and conservative management (n = 1). Clinical Significance Good outcomes can be achieved following fractures of the supraglenoid tubercle, although cases with comminution have a higher complication rate. Further research into the optimal method of fixation and postoperative management is required.

A kitten presented with acute kidney injury, bilateral hydronephrosis and proximal hydroureter, three days following bilateral ureteral ligation, during a complicated ovariohysterectomy procedure. Clinical signs were anorexia, lethargy, weakness, hypothermia, nausea, pain and anuria, associated with marked azotaemia, hyperkalaemia and metabolic acidosis. Insufficient response to medical management alone led to emergency surgical placement of bilateral subcutaneous ureteral bypass (SUB) systems, resulting in dramatic improvement in azotaemia and acidosis and resolution of hyperkalaemia. Elective bilateral neoureterocystostomy was performed the next day. The cat was clinically well for three months until the left SUB cystostomy catheter migrated out of the bladder resulting in uroabdomen. At this time, fluoroscopy demonstrated normal ureteral function bilaterally, so both SUBs were removed. Following recovery from surgery the cat has remained clinically normal. This report highlights the possibility of temporary SUB placement as a bridge to definitive ureteral repair in cases of accidental ureteral ligation.

This study concludes that obstructive sleep apnoea is a condition that may affect the CKCS and all five cases described here improved following surgical intervention. Consequently, sleep disordered breathing is a presentation that veterinary surgeons should be aware of in this breed.

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