The tibial slope is essential in knee biomechanics, both for ligament function and knee kinematics. High tibial osteotomy (HTO) designed primarily to correct frontal plane malalignment in osteoarthritis of the knee joint can cause unintentional tibial slope changes. We evaluated tibial slope changes in 40 knees in patients with medial compartment osteoarthritis treated by dome-type HTO and external fixation on one side, and followed up for 55 months on average. Four different tibial slope measurement methods (anterior tibial cortex, proximal tibial anatomic axis, posterior tibial cortex, and proximal fibular anatomic axis) were used preoperatively and postoperatively on both sides. Patients were allocated into three groups according to their final frontal plane alignment of the knee joint (hypercorrection, normocorrection, and undercorrection groups) based on tibiofemoral anatomic axis angle. As a whole, preoperative slope values (11.2 degrees, 7.5 degrees, 5.6 degrees, and 8.2 degrees for the four methods, respectively) displayed a significant decrease postoperatively (on average 7.9 degrees, 4.8 degrees, 2.2 degrees, and 3.7 degrees, respectively). Patients with undercorrection (or recurrence of deformity) had a more remarkable decrease in slope than those with normocorrection or hypercorrection. The higher the degree of postoperative mechanical axis valgus, the higher the degree of posterior tibial slope that resulted. Sagittal plane changes after dome-type HTO basically decreasing the tibial slope should be taken into account for subsequent reconstructive procedures such as total knee arthroplasty.

To evaluate electrophysiological incidence and the type of peroneal nerve lesions seen after high tibial osteotomy we conducted an electrophysiological study (electromyography and nerve conduction velocity studies) in 11 patients who were suffering from medial gonarthrosis and treated by Maquet barrel-vault type high tibial valgization osteotomy. All the patients were tested both pre- and postoperatively. Every patient was examined postoperatively for a minimum of a 6 months after surgery to eliminate spontaneously reversible lesions. Results obtained from nonoperated legs served as controls. Three patients (27%) with peroneal nerve lesions were detected electrophysiologically; one had only motor involvement, one only sensory involvement, and one both motor and sensory involvement. Clinically only one of these patients was symptomatic, and the other two were detected by electrophysiological means. Peroneal nerve lesions which may be overlooked by mild weakness and hypesthesia in the early postoperative period can be detected by electrophysiological means at a higher rate than expected. These lesions persist a relatively long time and even can be permanent despite the absence of clinical symptoms.

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ABSTRACT. An eighteen month old female Doberman pinscher dog was referred to teaching hospital of Adnan Menderes University, Faculty of Veterinary Medicine with the complaint of right forelimb lameness for a month. On the basis of clinical, radiographical, scintigraphical, computed tomographical and histopathological findings, aneurysmal bone cyst was diagnosed. Surgical curettage and bone cement treatment were applied. The patient recovered after 12 months. This case proves that aneurysmal bone cyst, without osteolysis and/or damages to the surrounding tissues, may result in a good prognosis if curettage and treatment with bone cement are done. KEY WORDS: aneurysmal bone cyst, bone cement, canine.