Precise and feasible measurements of lateral calcaneal lengthening osteotomies by radiostereometric analysis in cadaver feet
نویسندگان
چکیده
OBJECTIVES Lengthening osteotomies of the calcaneus in children are in general grafted with bone from the iliac crest. Artificial bone grafts have been introduced, however, their structural and clinical durability has not been documented. Radiostereometric analysis (RSA) is a very accurate and precise method for measurements of rigid body movements including the evaluation of joint implant and fracture stability, however, RSA has not previously been used in clinical studies of calcaneal osteotomies. We assessed the precision of RSA as a measurement tool in a lateral calcaneal lengthening osteotomy (LCLO). METHODS LCLO was performed in six fixed adult cadaver feet. Tantalum markers were inserted on each side of the osteotomy and in the cuboideum. Lengthening was done with a plexiglas wedge. A total of 24 radiological double examinations were obtained. Two feet were excluded due to loose and poorly dispersed markers. Precision was assessed as systematic bias and 95% repeatability limits. RESULTS Systematic bias was generally below 0.10 mm for translations. Precision of migration measurements was below 0.2 mm for translations in the osteotomy. CONCLUSION RSA is a precise tool for the evaluation of stability in LCLO. Cite this article: Bone Joint Res 2015;4:78-83.
منابع مشابه
Aetna considers radiostereometric analysis for migration and wear of orthopedic implants and for all other indications (e.g., assessment of spinal fusion, evaluation of stability in lateral calcaneal lengthening osteotomies, and prediction of long‐term outcome in total hip
Background Radiostereometric analysis (RSA) has been used to determine migration and wear of orthopedic implants. Radiostereometry makes use of a cage with control marker and fiducial to calculate a three dimensional (3D) coordinate system. Spherical tantalum markers are inserted into the bone and implant to identify distinct points of measurement for each part of the skeleton and implant invol...
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