Development of new methods for phalangeal fracture fixation

Alexander, Harold; Langrana, Noshir A.; Massengill, James B.; Weiss, Andrew B.

doi:10.1016/0021-9290(81)90055-5

Cited by 33 publications

(13 citation statements)

References 8 publications

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“…Such studies re port an increase in the flexural modulus, strength, and moduli values commensurate with bone replacement implants. 27 "Self -reinforced" composites have also been synthesized by incorporation of oriented PLA fibers in a matrix of the same ma te rial. 28 Past work in our group 29 involved the synthesis of PLLA-organoclay nanocomposites via the exfoliation adsorption film -casting technique, in which both the matrix and the filler are sonicated separately in a common solvent.…”

Section: Aliphatic Polyester Nanocompositesmentioning

confidence: 99%

Polymer Nanocomposites for Biomedical Applications

Hule¹,

Pochan²

2007

MRS Bull.

271

130

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Bionanocomposites have established themselves as a promising class of hybrid materials derived from natural and synthetic biodegradable polymers and organic/inorganic fillers. Different chemistries and compositions can lead to applications from tissue engineering to load-bearing composites for bone reconstruction. A critical factor underlying biomedical nanocomposite properties is interaction between the chosen matrix and the filler. This ar ticle discusses current efforts and key research challenges in the development of these ma te rials for use in potential biomedical applications.

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Section: Aliphatic Polyester Nanocompositesmentioning

confidence: 99%

Polymer Nanocomposites for Biomedical Applications

Hule¹,

Pochan²

2007

MRS Bull.

271

130

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“…By combining interlocking Kirschner wires with intramedullary P(L/D)LA 95/5 rods, torsional rigidity was further increased. Alexander et al (1981) developed a PLLA-carbon fibre intramedullary device for phalageal fracture fixation and reported that in transversly osteotomized pig metacarpals these devices provided significantly higher bending rigidity (240%) and maximum bending moment (297%) than obtained using two crossed Kirschner wires. SR-PGA, SR-PLLA, or SR-P(L/D)LA 96/4 rods are strong enough to use as intramedullary nails for femoral shaft osteotomies in rabbits and result in good healing (Manninen and Pohjonen, 1993;Saikku-B.…”

Section: Experimental Studiesmentioning

confidence: 99%

Use of Bioabsorbable Osteofixation Devices in the Hand

Waris

Ashammakhi

Kaarela

et al. 2004

Journal of Hand Surgery

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Bioabsorbable internal fixation by means of pins, tacks, screws and miniplates offers an alternative to metallic osteofixation for the stabilization of small bone fractures, osteotomies, ligament injuries and fusions in the hand. The advantages of using them include avoidance of metallic-implant-related long-term complications and a secondary removal operation. Currently the most commonly used devices are made of poly L-lactide (PLLA) and copolymers of polylactides (P(L/DL)LA) and polyglycolide (PLGA). In areas of mechanical stress, the use of ultra-high-strength self-reinforced devices is recommended. Biomechanical studies on fresh frozen bones have shown that the fixation rigidity achieved with self-reinforced devices approaches that of metallic osteofixation methods. The reliability of modern implants has been confirmed in several experimental and clinical studies.

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“…The mechanical properties of PLA deteriorate by hydrolysis in moisture and enzymatic action, and ultimately the material degrades into carbon dioxide and water [9,10]. These characteristics have been used to advantage in eco-friendly green plastics and medical tools such as bone setter bolts and pins [12,[15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Deterioration of the Mechanical Properties of Poly(lactic acid) Structures Fabricated by a Fused Filament Fabrication 3D Printer

et al. 2019

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A fused filament fabrication (FFF) 3D printer is a simple device capable of manufacturing three-dimensional structures in a series of easy steps. Commercial-level FFF 3D printers have spread rapidly in many fields in recent years. Poly(lactic acid) (PLA) is a biodegradable thermoplastic polymer used as a typical printing medium for FFF 3D printers. The FFF printer constructs an object with melted polymer extruded from a tiny scanning nozzle. The mechanical properties of FFF 3D structures printed with different scan patterns can therefore vary in accordance with the directions from which forces act upon them. The nozzle scan pattern also influences the deterioration of the mechanical properties of the structures in accordance with the degradation caused by the hydrolysis of PLA. In this study we conducted tensile tests to evaluate the strength characteristics of 3D printed test pieces formed from PLA using four different scan patterns: parallel, vertical, parallel-and-vertical, and cross-hatched at opposing diagonal angles to the tensile direction. We also formed test pieces by an injection molding method using the same material, for further comparison. We evaluated the deterioration of the test pieces after immersing them in saline for certain periods. After the test pieces formed by different nozzle scan patterns were immersed, they exhibited differences in the rates by which their maximum tensile stresses deteriorated and their masses increased through water uptake. The influences of the scan patterns could be classified into two types: the unidirectional scan pattern influence and bidirectional scan pattern influence. The data obtained in this research will be applied to structural design when the FFF 3D printer is employed for the fabrication of structures with PLA filament.

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Development of new methods for phalangeal fracture fixation

Cited by 33 publications

References 8 publications

Polymer Nanocomposites for Biomedical Applications

Polymer Nanocomposites for Biomedical Applications

Use of Bioabsorbable Osteofixation Devices in the Hand

Evaluation of the Deterioration of the Mechanical Properties of Poly(lactic acid) Structures Fabricated by a Fused Filament Fabrication 3D Printer

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