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SURGICAL management of patellar luxation (PL) is recommended to address lameness, prevent cartilage abrasion and slow the progression of osteoarthritis, and may include rectangular block recession trochleoplasty (Talcott and others 2000, Johnson and others 2001), tibial tuberosity transposition (TTT), soft tissue release and imbrication (Gibbons and others 2006). Femoral deformity (FD) in the dorsal plane may contribute to PL (Singleton 1969, Roush 1993) owing to the tension band effect of the quadriceps mechanism. Correction of FD by opening osteotomy or closing wedge ostectomy may be indicated (Roch and Gemmill 2008). External skeletal fixation has become the standard fixation technique for angular deformity correction in the distal limb (Fox and others 1995), while the use of bone plates for fixation of distal femoral ostectomy is more common (Bruecker 2006, Roch and Gemmill 2008). FD correction using the interlocking nail (ILN) has been described in the human literature (Paley 2005b), but not, to the authors' knowledge, in the veterinary literature. The ILN offers resistance to bending, axial compression and rotational forces (Dueland and Johnson 1993, Durall and Diaz 1996, Duhautois 2003) and stabilisation does not necessitate anatomical reconstruction (Horstman …
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