Biomaterial Database

The mechanical performance of the standard Hoffmann-Vidal external fixation apparatus. 1982

B T Briggs, and E Y Chao

A standard Hoffmann-Vidal quadrilateral fixation system for tibial fractures was analyzed using different geometric and material variations of the basic configuration. The fixation stiffness properties were quantitated to provide objective comparison. The results have shown that the bone-pin interface is the least-stiff link in the entire structure, particularly under the anterior-posterior bending mode. Rigidity of the device can be substantially improved by increasing the number of pins, using full threaded pins with a larger diameter, decreasing side connecting-rod distances, and increasing pin-separation distances in each pin group. Symmetrical tightening of the compression screws by hand is sufficient to produce compression of bone at the fracture site. The use of titanium pins tends to reduce stiffness, but using a frame made of titanium can significantly decrease the weight of the apparatus without decreasing its stiffness.

UI	MeSH Term	Description	Entries
D008953	Models, Anatomic	Three-dimensional representation to show anatomic structures. Models may be used in place of intact animals or organisms for teaching, practice, and study.	Anatomic Models,Models, Surgical,Moulages,Models, Anatomical,Anatomic Model,Anatomical Model,Anatomical Models,Model, Anatomic,Model, Anatomical,Model, Surgical,Moulage,Surgical Model,Surgical Models
D009984	Orthopedic Fixation Devices	Devices which are used in the treatment of orthopedic injuries and diseases.	Device, Orthopedic Fixation,Devices, Orthopedic Fixation,Fixation Device, Orthopedic,Fixation Devices, Orthopedic,Orthopedic Fixation Device
D011312	Pressure	A type of stress exerted uniformly in all directions. Its measure is the force exerted per unit area. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)	Pressures
D001858	Bone Nails	Rods of bone, metal, or other material used for fixation of the fragments or ends of fractured bones.	Bone Pins,Bone Nail,Bone Pin,Nail, Bone,Nails, Bone,Pin, Bone,Pins, Bone
D005592	Fracture Fixation	The use of metallic devices inserted into or through bone to hold a fracture in a set position and alignment while it heals.	Skeletal Fixation,Fracture Reduction,Fixation, Fracture,Fixation, Skeletal,Fixations, Fracture,Fixations, Skeletal,Fracture Fixations,Fracture Reductions,Reduction, Fracture,Reductions, Fracture,Skeletal Fixations
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001696	Biomechanical Phenomena	The properties, processes, and behavior of biological systems under the action of mechanical forces.	Biomechanics,Kinematics,Biomechanic Phenomena,Mechanobiological Phenomena,Biomechanic,Biomechanic Phenomenas,Phenomena, Biomechanic,Phenomena, Biomechanical,Phenomena, Mechanobiological,Phenomenas, Biomechanic
D013193	Stainless Steel	Stainless steel. A steel containing Ni, Cr, or both. It does not tarnish on exposure and is used in corrosive environments. (Grant & Hack's Chemical Dictionary, 5th ed)	Stainless Steels,Steel, Stainless,Steels, Stainless
D013718	Tensile Strength	The maximum stress a material subjected to a stretching load can withstand without tearing. (McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed, p2001)	Strength, Tensile,Strengths, Tensile,Tensile Strengths
D013978	Tibial Fractures	Fractures of the TIBIA.	Segond Fracture,Tillaux Fracture,Toddler's Fracture,Fracture, Segond,Fracture, Tibial,Fracture, Tillaux,Fracture, Toddler's,Fractures, Tibial,Tibial Fracture,Toddler Fracture,Toddlers Fracture