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J Leray

Publications and source records attributed to J Leray.

5 recordsLinked to original sources
PubMed1984

Callus characteristics following intramedullary nailing with stainless steel or epoxy-carbon nails.

Biological mechanical improvements of osteosynthesis make intramedullary nailing an attractive alternative to bone plate fixation. However, little is known about stress shielding induced by intramedullary implantation of a nail. To evaluate the effect of the nail rigidity on bone healing, mid-metatarsal osteotomies were performed in sheep and fixed with either stainless steel or epoxy-carbon composite V-shaped nails. Mechanical and histomorphometric features of the callus were evaluated 4 months postoperatively. No statistical difference between the two groups were demonstrated for either mechanical or microstructural characteristics. The presence of a fibrous membrane filling the bone/nail interface and allowing sliding micromotions of the implants and the much smaller effect of nail rigidity, as compared to bone plate after implantation, were assumed to be the main reason for this uniformity. At this stage of healing, bone characteristics were more related to a nonspecific (vascular) bone remodeling phenomenon than to a stress-shielding effect.

Animals↗
PubMed1980

Comparison of the effects of intramedullary nailing or plating on the mechanical properties of fracture callus.

Twelve metatarsal sheep bones were osteotomized and fixed either with an intramedullary nail or with a standard plate without compression. The mechanical properties of the callus were assessed three months post-operatively using a bending test. Ultimate bending strength, tangential stress, energy to tailure, stiffness and moment of inertia were measured or computed with the recorded data. It was concluded that the nailing technique improved callus properties more than plating. For the 12 weeks of consolidation, the mechanical properties of the callus at this stage have been ascribed to the degree of mineralization.

Animals↗
PubMedDate not supplied

[The mechanical properties of callus in fractures treated by nailing or plating: an experimental study (author's transl)].

Twelve sheep were used in an experimental study on bone healing. The first metatarsal was fractured and fixed either by plating without compression or by intramedullary nailing. Three months later, the animals were sacrificed, the fractured bone removed and the mechanical properties of the callus were assessed by resistance to rupture, tangential strain measurement, the energy required for rupture, module of elasticity and the moment of inertia. It was concluded that callus was superior quantitatively as well as qualitatively after nailing. The mechanical properties of the callus wwere related to its degree of mineralisation.

Animals↗