We provide a lower bound construction showing that the union of unit balls in R 3 has quadratic complexity, even if they all contain the origin. This settles a conjecture of Sharir. Key-words: Computational geometry, Union of balls, Geometric example Une union de boules unités d'intersection non vide a une complexité quadratique Résumé : Nous proposons une construction d'un ensemble de boules d...

Study Design: Prospective consecutive series. Objective: To Evaluate the role of exchange nailing in non union of fractures of long bones of lower limb. Summary of Background data: Exchange Nailing which includes removal of current intramedullary nail, reaming of medullary canal and placement of larger diameter nail shows increased union rate as seen in various studies. Methods: A Prospective s...

INTRODUCTION Non-union of the tibia complicated by osteomyelitis is one of the most challenging problems in orthopaedic surgery. There remains a significant amount of debate and controversy regarding the optimal medical management of infected tibial non-union. There are few articles which have reported the outcomes of treatment for infected non-union of tibia from single-stage reconstruction wi...

Background: The most feared complication of fracture management is non-union. Non-union can be the following types, hypertrophic, oligotrophic, atrophic, and septic. In view a non-union, exchange nailing preferred so routinely performed for non-unions fractures tibia. Case Presentation: Here, we present case an implant failure from atraumatic event in atrophic non-union tibia, which was treated...

PURPOSE To compare various treatment modalities (plating, Ilizarov external fixation, and non-vascular fibular cortical strut grafting) for non-union of humeral shaft fractures. METHODS Records of 9 women and 26 men aged 24 to 71 (mean, 42) years who presented with non-union of humeral shaft fractures were reviewed. The humeral shaft fractures were secondary to low-energy trauma (n=22) or veh...

We report a radiological sign which predicts progression to hypertrophic non-union for fractures of the tibial diaphysis. Radiographs of 46 tibial fractures were reviewed independently by four orthopaedic trauma surgeons and two musculoskeletal radiologists. Patients were identified from a database of tibial fractures managed with Ilizarov frame fixation. There were 23 fractures that progressed...

We study cooperation structures with the following property: given any two feasible coalitions with non-empty intersection, its union is a feasible coalition again. TU-games restricted by union stable systems generalize graph-restricted games and games with permission structures. A study about the differences between the position value in union stable systems and hypergraph communication situat...

sternal non-:union: is a severe complication of sternotomy closure following open heart surgeries. healing problems typically occur in 0.3% to 5% of patients. technetium-99m methylene diphosphonate (99mtc-mdp) bone scintigraphy has been used to assess bone non:union: to predict the healing response for proper management.  in this report, we present the case of a marked sternal non:union: follow...

sternal non-union is a severe complication of sternotomy closure following open heart surgeries. healing problems typically occur in 0.3% to 5% of patients. technetium-99m methylene diphosphonate (99mtc-mdp) bone scintigraphy has been used to assess bone nonunion to predict the healing response for proper management.  in this report, we present the case of a marked sternal nonunion following...