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We report staged treatment of severe combined spinal deformity in an 11-year-old patient with Ollier disease and abnormal cervical vertebra. Combined scoliosis with systemic pathology and abnormal vertebrae is a rare condition and features atypical deformity location and rapid progression rate and frequently involves the rib cage and pelvis, disturbing the function of chest organs and skeleton. Progressive deformity resulted in cachexia and acute respiratory failure. A halo-pelvic distraction device assembled of Ilizarov components was employed for a staged surgical treatment performed for lifesaving indications. After vital functions stabilized, the scoliosis curve of the cervical spine was corrected and fixed with a hybrid system of transpedicular supporting points, connecting rods, and connectors that provided staged distraction during growth. The treatment showed good functional and cosmetic result.

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To compare the efficacy of spinal motion segment stabilization with rigid instrumental fixation and dynamic NiTi clamps. Material and Methods. Fixation of contiguous vertebral bodies in the lumbar spine was performed in 20 mongrel dogs, males and females, 4 months of age. A plate for internal osteosynthesis as a fixator was used in the first experimental series and NiTi clamps with thermochemical shape memory effect-in the second. All animals were examined using radiography and roentgenometry of the lumbar spine. The instrumented lumbar vertebrae were investigated histologically. Results. Fixing screws of a plate migrated in the coronal plane during the animal's growth. Fixation of contiguous vertebrae with NiTi clamps results in formation of well-vascularized connective-tissue capsule with well-developed fibrous bundle framework connected to bone bed with perforating fibers, thus providing micromotion of the spinal segment, prevention of implant migration, and trophic support of the fixed area. Conclusion. The study showed that fixation of contiguous vertebral bodies with NiTi clamps was more effective.

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