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Thai J Vet Med Suppl. 2017, 47 : S89 Y-fracture of the humeral condyle L.F.H. Theyse Anicura Referral Centres Dordrecht & Rijswijk, Netherlands the sliding bone tunnel optimally in the lateral part of the condyle. After reduction the screw tunnel in the medial condylar part is drilled from lateral to medial. The medial condylar part can be tapped or a self-tapping screw is used and placed with compression. At this stage the fracture should be aligned anatomically, but is not sufficiently stable to bear any weight. A smaller lateral LCP or similar locking plate is used either lateral or caudal on the lateral epicondyloid crest. The aim is to divert all loading forces from the epiphysis to the shaft of the humerus while maintaining compression over the humeral condyle. In dogs with condylar fissures responsible for the bicondylar fracture formation, bone healing of the condyle is either extremely slow or nonexisting. This is the reason these dogs should receive a shaft screw whenever possible. In these dogs, osteostyxis of the sclerotic fracture zone can be performed but there is no hard evidence that this provides better outcomes. In traumatic cases and young dogs prognosis is favourable as long as the technical requirements are met. Salter-Harris type IV fractures or the lateral condylar part of the distal humerus are quite common in young small breed dogs. A fall from a height usually is the cause. In contrast, Y- or bicondylar fractures are quite uncommon. The can present as a more severe variety of the lateral condylar fracture but also occur in adult dogs after severe trauma including road traffic accidents. The English springer spaniel breed is known for fissure formation (former incomplete ossification) of the humeral condyle rendering these dogs vulnerable to lateral condylar and bicondylar fractures of the distal humerus. As these fractures are intra-articular meticulous reduction and stabilisation is eminent to preserve optimal function and prevent osteoarthritis (3). It should be clear that in any circumstance there will be damage to the articular cartilage and any unstable fragments should be removed. Stabilisation can be performed by using a locking compression plate (LCP) on the medial side of the humeral shaft and epicondyloid crest first and then reducing and stabilising the lateral part of the humeral condyle consistent with the treatment of lateral humeral condylar fractures (2). The stabilisation of both lateral condylar and bicondylar fractures relies on the compression of the condyle over the fracture line. This is technically best performed by placing a lag screw or shaft screw from lateral to medial (1). The screw is directed from lateral to medial as the medial half of the condyle is larger than the lateral part offering the surgeon a larger safe corridor. In most cases an inside-out technique for drilling is used to position The dogs will develop osteoarthritis in the elbow joint with variable influence on the performance. 1. 2. 3. S89 References Moores AP et al. 2014. Vet Comp Orthop Traumatol 27(3):179-85. Ness MG. 2009. Vet Comp Orthop Traumatol 22(6):492-7. Nortje J et al. 2015. N Z Vet J 63(2):110-6.