The potential of bioresorbable plates and screws in distal radius fracture fixation.
Explore the source record for details and available documents.
Absorbable Implants↗
Biomedical subjects
J Goldhahn
Publications and source records attributed to J Goldhahn.
Mechanical boundary conditions of fracture healing: borderline indications in the treatment of unreamed tibial nailing.
Unreamed nailing favors biology at the expense of the achievable mechanical stability. It is therefore of interest to define the limits of the clinical indications for this method. The extended usage of unreamed tibial nailing resulted in reports of an increased rate of complications, especially for the distal portion of the tibia. The goals of this work were to gain a thorough understanding of the load-sharing mechanism between unreamed nail and bone in a fractured tibia, to identify the mechanical reasons for the unfavorable clinical results, and to identify borderline indications due to biomechanical factors. In a three-dimensional finite element model of a human tibia, horizontal defects were stabilized by means of unreamed nailing for five different fracture locations, including proximal and distal borderline indications for this treatment method. The loading of the bone, the loading of the implant and the inter-fragmentary strains were computed. The findings of this study show that with all muscle and joint contact forces included, nailing leads to considerable unloading of the interlocked bone segments. Unreamed nailing of the distal defect results in an extremely low axial and high shear strain between the fragments. The results suggest that mechanical conditions are advantageous to unreamed nailing of proximal and mid-diaphyseal defects. Apart from biological reasons, clinical problems reported for distal fractures may be due to the less favorable mechanical conditions in unreamed nailing. From a biomechanical perspective, the treatment of distal tibial shaft fractures by means of unreamed nailing without additional fragment contact or without stabilizing the fibula should be carefully reconsidered.
Biomechanical Phenomena↗
[Preissler endoscopic carpal ligament release. Experiences from 1,000 operations].
To reduce the postoperative morbidity different methods of endoscopic carpal tunnel release have been developed since 1989. We report our results and experiences with the method described by Preissler. Since its introduction in our clinic 1995, 1,000 patients have been operated until now. Out of 477 with an electrophysiological examination, 396 patients (83%) showed no symptoms. In three cases it was necessary to change to an open approach during operation, there were no other intraoperative complications. To evaluate our results we sent a questionnaire to 32 of our patients that were operated on one hand with an open technique and on the other hand with the endoscopic technique of Preissler. The results demonstrated that the endoscopic method was significantly better. From our experience endoscopic technique for carpal tunnel release Preissler's is a safe, well accepted, easy for learning and cheap alternative to the open procedure.
Adult↗