[The wrapping induced membrane technique for treating recalcitrant non unions].

The induced membrane technique is now well accepted for reconstruction of segmental bone defect. On the other hand, some cases of aseptic non-union are unsuccessfully treated by several surgical attempts for obtaining bone healing. The two stages wrapping induced membrane technique was developed initially for treating atrophic and recalcitrant aseptic non union without bone loss. At the first stage, the site of non-union was firmly fixed and tiles of cement were placed close to the bone on two or three aspects of the bone. At the second stage, after removing the spacers, the induced cavities were filled with cancellous bone autograft. In the two reported cases bone healing was acquired in 4 months. One case was a recalcitrant atrophic non-union of the humeral shaft, the other case concerned the enhancement of an insufficient segmental reconstruction of the femur. The follow up were respectively 3 years and 2 years without complication. The membrane induced by the cement tiles prevents the bone graft resorption and improves the osteogenicity through its biological properties.