To devise a method to quantify and optimize tightness when inserting cortical screws, based on bone characterization and screw geometry. Cortical human cadaveric diaphyseal tibiae screw holes (n = 20) underwent destructive testing to firstly establish the relationship between cortical thickness and experimental stripping torque (Tstr), and secondly to calibrate an equation to predict Tstr. Using the equation’s predictions, 3.5 mm screws were inserted (n = 66) to targeted torques representing 40% to 100% of Tstr, with recording of compression generated during tightening. Once the target torque had been achieved, immediate pullout testing was performed.Aims
Methods
periosteal stripping in the long lower limb bones of thirty children with shortening after poliomyelitis was performed. All have been followed up for five years. A relative increase in length attributable to the periosteal stripping procedure was seen in the majority. The conclusions are that this simple procedure is indicated in minor degrees of limb inequality in growing children, but that the haphazard response precludes any accurate estimation of the final outcome of such a procedure.
1. Thirty-three children with thirty-eight feet affected by a cavo-varus deformity and treated by calcaneal osteotomy with concomitant stripping of plantar muscles were reviewed two to ten years after operation. 2. Out of twenty-six patients who were over eleven years old at the time of the review, fourteen (with eighteen feet) did not need any further treatment. In three other patients the deformity had recurred to a slight degree but did not warrant tarsal reconstruction. In the remaining nine patients the recurrence was marked and necessitated tarsal reconstruction. 3. The combined procedure is of value when there is progressive deformity in children too young for tarsal reconstruction.
