A method for contrasting plates of acrylic resins for cranioplasty in defects in the skull bones was developed. Per each 1.0 g of protacryl (or butacryl, etc.) powder 0.2 g of iodine-containing agents (verografin, urografin, urotrast, etc.) was added. This ensured a high contrast of the allograft not only in the immediate but also in the late period. The developed method is of great significance in conducting expert medical assessment of working capacity when there is no corresponding medical documentation and the medical history is unclear.
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Cranioplasty is a unique procedure with a rich history. Since ancient times, a diverse array of materials from coconut shells to gold plates has been used for the repair of cranial defects. More recently, World War II greatly increased the demand for cranioplasty procedures and renewed interest in the search for a suitable synthetic material for cranioprostheses.
View Article and Find Full Text PDFPorous tantalum in reconstructive surgery of the knee: a review.
J Knee Surg
July 2007
Rush University Medical Center, Chicago, Ill, USA.
Porous tantalum represents an alternative metal for primary and revision total knee arthroplasty (TKA) with several unique properties. Tantalum is a transition metal, which in its bulk form has shown excellent biocompatibility and is safe to use in vivo as evidenced by its current application in pacemaker electrodes, cranioplasty plates, and as radiopaque markers. Current designs for orthopedic implants maintain a high volumetric porosity (70%-80%), low modulus of elasticity (3 MPa), and high frictional characteristics, making this metal conducive to biologic fixation.
View Article and Find Full Text PDFExperimental and clinical performance of porous tantalum in orthopedic surgery.
Biomaterials
September 2006
Orthopaedics, Rush University Medical Center, 1725 E. Harrison Street, Suite 1063, Chicago, IL 60612, USA.
Porous tantalum, a new low modulus metal with a characteristic appearance similar to cancellous bone, is currently available for use in several orthopedic applications (hip and knee arthroplasty, spine surgery, and bone graft substitute). The open-cell structure of repeating dodecahedrons is produced via carbon vapor deposition/infiltration of commercially pure tantalum onto a vitreous carbon scaffolding. This transition metal maintains several interesting biomaterial properties, including: a high volumetric porosity (70-80%), low modulus of elasticity (3MPa), and high frictional characteristics.
View Article and Find Full Text PDFThe combined use of hydroxyapatite and bioresorbable plates to repair cranial defects in children.
J Neurosurg
January 2005
Department of Pediatric Neurosurgery, University of California, Davis, USA.
Object: Hydroxyapatite cement (HAC) is used with increasing frequency by craniofacial surgeons for building facial and skull base structures and by neurosurgeons for cranioplasty. Failures of HAC in cranioplasty have been attributed to breakage due to subjacent cerebrospinal fluid (CSF) pulsations through the dura mater. The authors describe a technique that involves inserting a resorbable MacroPore perforated plate to dampen CSF pulsations and then pouring HAC over the plate to fill a cranial defect and complete skull contouring.
View Article and Find Full Text PDFBrain SPECT artifacts in patients having metallic cranioplasty.
J Nucl Med Technol
December 2001
Radiation Safety Office and Nuclear Medicine Service, Department of Veterans Affairs Medical Center, Lexington, Kentucky 40511-1093, USA.
Objective: Over the past few years, we have performed several brain SPECT studies on patients who have had previous head trauma that required metallic cranioplasty. Transaxial images showed clearly defined photon-deficient areas extending from the brain tissue into the area of the scalp. To investigate the extent and pattern of this type of artifact, SPECT brain phantom studies were performed and compared with the patient studies.
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