Progress Using mathematical models, we are investigating the influence of plate fixation on the internal stresses in long bones subjected to all known in vivo loading modes . The variables we are studying include : plate geometry, plate/bone fixity, and screw tightness. The mathematical models are based upon the finite element technique . The models will be subjected to all physiological loadin...

We propose the use of a computer-aided design (CAD) system for treating bone fractures in small animals. During surgical planning, the veterinarian sketches a simple plate by referring to computed tomography images. A CAD operator then uses polygonal approximation (triangulation) of the surface of the bone region to model the plate. After the approximated shape is imported into the CAD system a...

Several papers in this issue of the Journal address topics in the theme of plate and screw fixation (1–4). A critical element of this form of internal fixation is that the maintenance of stability provided by the plate relies heavily on the integrity of the screw fixation. Bone screws can perform their work in several ways. In conventional plate fixation, the head of a tightened screw compresse...

An ideal bone plate for internal fixation of bone fractures should have good biomechanical properties and biocompatibility. In this study, we prepared a new nondegradable bone plate composed of a ternary nano-hydroxyapatite/polyamide 66/glass fiber (n-HA/PA66/GF) composite. A breakage area on the n-HA/PA66/GF plate surface was characterized by scanning electron microscopy. Its mechanical proper...

We devised a new method for examining the structural changes that occur in trabecular bone in aging and in osteoporosis. With simultaneous measurement of total perimeter and bone area in thin sections, indirect indices of mean trabecular plate thickness (MTPT) and mean trabecular plate density (MTPD) can be derived, such that trabecular bone volume = MTPD X MTPT. MTPD is an index of the probabi...

OBJECTIVE To determine the material properties of the subchondral bone plate in patients with osteoarthritis or osteoporosis. METHODS Femoral heads were obtained after surgical removal from age and sex matched groups of patients with either osteoporosis (OP), after a fractured neck of femur, or osteoarthritis (OA) and compared with a normal group. The mechanical stiffness, density, and compos...

The biomechanical performance of a locking compression plate system was compared to an intramedullary photodynamic bone stabilization system in a femur and humerus osteotomy model. The photodynamic bone stabilization system utilizes an angioplasty-like balloon that is introduced into the intramedullary canal of a fractured bone, filled with monomer that is then polymerized and hardened by visib...

Background: Growth plate is responsible for bone elongation and its injury could result in severe orthopedic problems. OBJECTIVES: This study was aimed to investigate the radiographic changes after transplanting the fresh autogenous ear cartilage impregnated with PRP and MSc in treatment of growth plate injury in lamb. METHODS: Cranial half (½) in length in full depth of the right hind limb gro...

BACKGROUND There is a lack of understanding of the morphological characteristics of the cartilage-bone interface. Materials that are currently being used in tissue engineering do not adequately support the regeneration of bone and cartilage tissues. The present study aimed to explore the morphological characteristics of cartilage-bone transitional structures in the human knee joint and to desig...

Method: Pre-operative computed tomography (CT) scan data of the pilot study (mandible affected by ameloblastoma) are elaborated to produce a virtual surgical plan including osteotomy sites, entity of bone resection and therefore reconstruction. STL files are produced for a cutting guide and a bone plate. The cutting guide and the bone plate of the device are finally constructed by Direct Metal ...