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surgical screws

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c9001664
EISBN: 978-1-62708-226-6
... screws Plastic deformation Surgical implants 316L UNS S31603 Fatigue fracture Corrosion fatigue In fractures of and around the head of the femur, a compression hip screw surgical implant is sometimes employed to provide bone alignment and fixation during healing. Figure 1 shows schematically...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c9001690
EISBN: 978-1-62708-226-6
...-6Al-4V alloy 5.5–6.75 3.5–4.5 0.2 max 0.05 max 0.08 max 0.015 max … balance Nitinol ASTM F2063-00 … … 0.05 max … 0.02 max … 54.5–57.0 balance (a) Undetermined The use of dissimilar metals (such as CP-Ti plate and Ti-6Al-4V alloy plate screws) in surgical implants is not...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048405
EISBN: 978-1-62708-226-6
... screws were used with a relatively rigid plate to treat a fracture complication in the upper end of the femur. The fatigue failures were explained by signs of unstable fixation revealed by radiographs. Surgical implants 316LR Fatigue fracture Fatigue fracture can occur on different thread...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048419
EISBN: 978-1-62708-226-6
... type 316LR stainless steel and some mechanical fretting and very few corrosion pits were revealed. Type 304 stainless steel was deemed not to be satisfactory as an implant material. Inclusions Surgical implants 304 UNS S30400 Pitting corrosion Figure 1 shows a screw head that exhibits...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c9001606
EISBN: 978-1-62708-226-6
..., or plates, these orthopedic devices are surgically implanted and affixed to bones, usually with screws of the same alloy composition. Fixation implants usually remain in the human body until the broken bone has healed sufficiently to sustain normal loading without the additional support provided by...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048421
EISBN: 978-1-62708-226-6
... of corrosion were observed in connection with fretting structures. Surgical implants Wear particles Titanium Fretting wear Figure 1(a) shows a portion of a titanium screw head with a lip of material that was transported by fretting at a plate-hole edge. A flat fretting zone is visible...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048420
EISBN: 978-1-62708-226-6
... possible. Biochemistry Surgical implants Wear particles 316LR Pitting corrosion Figure 1 shows a plate hole with the area that was in contact with the screw head. In contrast to Example, the attack on this high-quality type 316LR stainless steel was only shallow. Figure 1(a) shows an...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048400
EISBN: 978-1-62708-226-6
... Abstract Cerclage wire, which was used with two screws and washers for a tension band in a corrective internal fixation, was found broken at several points and corroded after nine months in service. The material was examined using energy-dispersive x-ray analysis and determined not to be in...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048410
EISBN: 978-1-62708-226-6
... horizontal plane, and the fracture gap was considerably open. The screws and plates supplied by different manufacturers were revealed to be different with respect to microcleanliness (primary inclusion content) of the materials and only one of them was found to be according to specifications. The local crack...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c9001579
EISBN: 978-1-62708-226-6
.... The fracture originated as a consequence of stress intensification at the edge of a screw hole located just above the bone fracture; several fatigue cracks were also observed on the opposite side of the screw hole edge. The crack propagated in a brittle-like fashion after a limited number of cycles...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0089543
EISBN: 978-1-62708-226-6
.... Bone screws Casting defects Screws Surgical implants ASTM F75 Casting-related failures Portions of the threads of the screw shown in Fig. 1(a) had broken off, and other threads had cracked. The screw was made from a cast Co-Cr-Mo alloy. A longitudinal section through the screw revealed gas...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048397
EISBN: 978-1-62708-226-6
... soft austenitic 304 stainless steel used to make the screws. The corrosion products of the plate were revealed by microprobe analysis to impregnate the surrounding tissues. Improper material selection was concluded to be the reason for the general corrosion behavior. Carbides Corrosion products...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048407
EISBN: 978-1-62708-226-6
... Abstract The plate used to treat a pseudarthrosis in the proximal femur was investigated for reasons of non-progress of healing. Fatigue cracks were revealed on the top surface of the small section of the plate at the fifth screw hole. The plate was found to be heavily loaded by comparison of...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c0048399
EISBN: 978-1-62708-226-6
... fracture surface of this pin. Thus, the effect of different conditions of cobalt-chromium alloys on failure behavior was demonstrated as a result of this study. Grain boundaries Surgical implants ASTM F75 Brittle fracture Two of four adjustable Moore pins, which had been used to stabilize a...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001097
EISBN: 978-1-62708-214-3
... Abstract Two type 316L stainless steel orthopedic screws broke approximately 6 weeks after surgical implant. The screws had been used to fasten a seven-hole narrow dynamic compression plate to a patient's spine. The broken screws and screws of the same vintage and source were examined using...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001804
EISBN: 978-1-62708-241-9
.... The results of the study indicated that the screw failed due to fatigue fracture stemming from surface cracks generated by stress concentration likely caused by grooves left by improper machining. surgical screws fatigue fracture machining defects stainless steel cracking optical and...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001264
EISBN: 978-1-62708-215-0
... Abstract A type 316L stainless steel “Jewett nail” hip implant failed after 2 months of service. Fracture occurred through the first of five screw holes in the plate section. Microscopic examination of mating fracture surfaces showed that failure had initiated at the outside (convex) surface of...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001819
EISBN: 978-1-62708-180-1
... plate with glide holes. (i) Classical Bagby compression bone plate. (j) Cortical bone screw. (k) Cancellous bone screw (with shaft to produce compression). (l) Condylar angle blade plate. (m) Hip plate for osteotomies. (n) Jewett nail plate with three-flanged nail. (o) Two-component dynamic hip screw...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001803
EISBN: 978-1-62708-241-9
.... Jr. : “ Failure Analysis of Surgical Implants in Brazil ,” J. Eng. Failure Analys. , 2002 , 9 , pp. 621 – 633 10.1016/S1350-6307(02)00026-2 . 3. Azevedo C.R.F. : “ Failure Analysis of a Commercially Pure Titanium Plate for Osteosynthesis ,” J. Eng. Failure Analys. , 2003 , 10...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001801
EISBN: 978-1-62708-241-9
... fracture of 316L SS screws employed for surgical implanting , in Handbook of Case Histories in Failure Analysis , vol. 1 , ed. by Esakul K.A. ( ASM International , Materials Park , 1992 ) 6. Prikryl M. et al. , Role of corrosion in Harrington and Luque rods failure . Biomaterials...