Evaluation of absorbable composite polylactide–hydroxyapatite bone fixation devices: a cohort study

In this chapter, low elastic modulus porous Mg-Zn-Mn-(Si, HA) alloy was fabricated by mechanical alloying and spark plasma sintering technique. The microstructure, topography, elemental, and chemical composition of the as-sintered bio-composite were characterized by optical microscope, FE-SEM, EDS, and XRD technique. The mechanical properties such as hardness and elastic modulus were determined by nanoindentation technique. The as-sintered bio-composites show low ductility due to the presence of Si, Ca, and Zn elements. The presence of Mg matrix was observed as primary grain and the presence of coarse Mg2Si, Zn, and CaMg as a secondary grain boundary. EDS spectrum and XRD pattern confirms the formation of intermetallic biocompatible phases in the sintered compact, which is beneficial to form apatite and improved the bioactivity of the alloy for osseointegration. The lowest elastic modulus of 28 GPa was measured. Moreover, the as-sintered bio-composites has high corrosion resistance and corrosion rate of the Mg was decreased by the addition of HA and Si element.

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T-Screw. A new bone fixation device

Journal of the American Podiatric Medical Association ◽

10.7547/87507315-79-2-65 ◽

1989 ◽

Vol 79 (2) ◽

pp. 65-73

Author(s):

TK Lichty ◽

WW Gronen ◽

JD Johnson ◽

WK Oliver

Keyword(s):

Clinical Study ◽

Bone Healing ◽

Normal Function ◽

Fixation Device ◽

Bone Fixation ◽

Early Return ◽

Fda Approval ◽

Fixation Devices

The T-Screw was patented in 1984. A 5-year study was begun in 1980, and FDA approval was granted in 1985. Detailed results of this clinical study will be reported in a later paper. The purpose of this paper is to introduce the device. The authors have found that early return to normal function and wearing shoes has been possible when using T-Screws for fixation of podiatric osteotomies. The screw appears to accelerate bone healing and has numerous applications throughout the foot. The authors believe that its ease of application and removal as well as its ability to generate rigid, compressive fixation makes it an excellent alternative to current fixation devices.

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Orthosorb resorption evaluation using MRI and histologic analysis

Journal of the American Podiatric Medical Association ◽

10.7547/87507315-84-1-10 ◽

1994 ◽

Vol 84 (1) ◽

pp. 10-13 ◽

Cited By ~ 2

Author(s):

ME Bashara ◽

MR Mourino ◽

MJ Trepal ◽

WC Lambert

Keyword(s):

Magnetic Resonance Imaging ◽

Animal Model ◽

Magnetic Resonance ◽

Surgical Procedures ◽

Magnetic Resonance Image ◽

Resonance Imaging ◽

Bone Fixation ◽

Radiographic Technique ◽

Fixation Devices ◽

Over Time

Resorbable bone fixation devices may be used in various surgical procedures for internal fixation in place of traditional metallic devices. Currently, there is no radiographic technique for tracing the postsurgical location and resorption of these devices. This study was undertaken to ascertain whether magnetic resonance imaging is a suitable tool for performing such evaluations. Using an animal model, the authors investigated the correlation over time between the magnetic resonance image of a surgically implanted pin and its histologically verified location and state.

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