Positive experience of using Z-shaped achillotomy for canine leg lengthening at high daily rate

UDC:[636.7:617.584/.586-089.227.84]-092.9

Gorbach E.N., Stepanov M.A.

Summary. The cases of the knee flexion contracture and equinus foot are not infrequent when lengthening the lower limbs by the method of transosseous distraction osteosynthesis - above 15% of the initial length, as well as when using higher rates of distraction - 2 mm per day and more. The imbalance of antagonist muscles and poor stretchability of the Achilles tendon considered to be one of the causes of developing adjacent joint contractures during leg lengthening. Two series of experiments performed in 19 adult mongrel dogs (at the age of 1-3 years). In the first series (control, n=10) the animals underwent leg lengthening by the transosseous osteosynthesis method according to Ilizarov with the rate of 3 mm for 120 times using an automatic drive without additional impacts, in the second series (experiment, n=9) Z-shaped achillotomy was performed in addition to prevent equinus foot formation after leg bone osteoclasia. The investigations using clinical, radiological, and histological methods were made at the end of distraction period (10 days), 30 days after fixation with the device and 30 days after the device dismounting. It was found, that the use of Z-shaped achillotomy during leg lengthening with the average daily rate which was increased up to 3 mm and with high division (120 times) that were provided by the automatic drive, excluded foot equinus and minimized the development of flexion contracture of the knee and articulatio tarsi and, thereby optimized the conditions for reparative osteogenesis in the limb segment under lengthening.

Keywords: dog, contracture, foot equines, osteoclasis, achillotomy, transosseousdistraction osteosynthesis, automated drive, high-frequency rate of lengthening, tibia, reparative osteosynthesis.

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Author affiliation:

Stepanov Mikhail A., Ph.D. in Veterinary Medicine, leading scientific researcher, veterinarian of the laboratory of purulent osteology and replacement of defects of limbs of the Ilizarov Russian Scientific Center; 6, Ulyanova st., Kurgan, 640014; phone: 8-3522-415227; е-mail: m-stepanov@mail.ru.

Responsible for correspondence with the editorial board: Gorbach Elena N., Ph.D. in Biology, leading scientific researcher of the laboratory of morphology of the Ilizarov Russian Scientific Center; 6, Ulyanova st., Kurgan, 640014; phone: 8-3522-415273; e-mail: gorbach.e@mail.ru.