Assessment of Quantitative Methodology for Evaluation of Retrieved Metallic Femoral Components From Total Knee Replacements

2011 ◽  
Author(s):  
Estefania Alvarez ◽  
Marcella E. Elpers ◽  
Hillary M. Cash ◽  
Michelle E. Wabler ◽  
John D. DesJardins
Keyword(s):  
Surface Roughness ◽  
Femoral Component ◽  
Joint Replacement ◽  
Total Joint Replacement ◽  
Articular Surface ◽  
Surface Profile ◽  
Surface Damage ◽  
Damage Score ◽  
Visual Damage

The metallic surfaces of total joint replacement components are subject to surface damage and roughening that can severely limit the service lifetime of the bearing system. To date, there are no standards by which to characterize the severity and modes of this critical surface damage, and therefore it remains difficult to accurately assess how femoral damage influences total joint replacement longevity. This study introduces a novel femoral component damage scoring methodology that combines a semi-quantitative visual damage scoring assessment and a fully quantitative non-contact characterization of the articular surface profile. The femoral surface was divided into 6 pre-determined zones, with 5 possible modes of damage and 4 (0–3) levels of damage severity, to produce a maximum possible damage score of 90. The 5 modes of metallic surface damage were; number of scratches, scratch depth, third body wear, abrasion and pitting. Three independent examiners were trained and then evaluated 33 retrieved TKRs systems (n = 11 Oxinium and n = 23 CoCr) with in-situ times of 3.6 ± 4.2 yrs (range of 0.1–20 yrs). The average damage score was 19.9 ± 30.8 with an inter-observer variability of only 1.5% Articular damage mode frequency was calculated and found to be 61% for scratching, 15% for pitting and 52% for abrasion. The quantitative characterization of the articular surface profile of the femoral component using non-contact profilometry (n = 150/retrieved component) illustrated a positive correlation between damage score and the average surface roughness for implants with an Ra greater than 65 nm (R2 of 0.865). This methodology identified a critical Ra threshold above the standard manufacturing tolerance (∼50nm) wherein visual damage scoring was predictive of increases in quantitative surface roughness. This study validates the use of this novel methodology across most TKR material pairings. Future work will correlate damage scores and measured surface roughness with patient demographic and functional information.

Tubing String Thread Sealing Surfaces Damage Evaluation Based on Acoustic Elasticity Theory

2019 ◽  
Vol 944 ◽  
pp. 828-834 ◽  
Author(s):  
Jian Jun Wang ◽  
Jian Hua Sun ◽  
Shang Yu Yang ◽  
Yao Rong Feng ◽  
Kai Lin
Keyword(s):  
Surface Roughness ◽  
Elasticity Theory ◽  
Contact Stress ◽  
Surface Characterization ◽  
Surface Damage ◽  
Center Frequency ◽  
Sealing Performance ◽  
Tubing String ◽  
Acoustic Elasticity

During the processing of tubing premium threaded made up, the degree of the thread sealing surface intactness will directly affect the sealing performance of the string. Nevertheless, there are some difficulties to detect the damage of the engaged sealing surface effectively. In the present study the sealing surface damage was judged by the sealing surface contact stress’s relative changes according to the acoustic elasticity theory,. At the same time, the wear defects generated at the tubing sealing surface, during the tubing made up, contrasted with the wear and unworn surface roughness of coupling ultrasonic detected about the sealing surface. The results showed that with the acoustic amplitude evaluated the sealing contact stress was susceptible to the influence of surface roughness of coupling. But the reflection wave with the center frequency on the sealing surface characterization of the contact stress could avoid this problem effectively.

Cobalt-chromium femoral components developed scratches and released metal debris in simulated wear whereas ceramic femoral components did not

2021 ◽  
Vol 103-B (6 Supple A) ◽  
pp. 94-101
Author(s):  
Marie E. Roy ◽  
Leo A. Whiteside ◽  
Kevin K. Ly ◽  
Matthew J. Gauvain
Keyword(s):  
Surface Roughness ◽  
Articular Surface ◽  
Surface Damage ◽  
Cobalt Chromium ◽  
Metal Debris ◽  
Material Loss ◽  
Wear Process ◽  
Measuring Surface ◽  
Ceramic Components ◽  
Total Knee

Aims The aims of this study were to evaluate wear on the surface of cobalt-chromium (CoCr) femoral components used in total knee arthroplasty (TKA) and compare the wear of these components with that of ceramic femoral components. Methods Optical profilometry was used to evaluate surface roughness and to examine the features created by the wear process in a knee wear simulator. We developed a method of measuring surface changes on five CoCr femoral components and quantifying the loss of material from the articular surface during the wear process. We also examined the articular surface of three ceramic femoral components from a previous test for evidence of surface damage, and compared it with that of CoCr components. Results We found that the surface roughness of CoCr components rapidly increased during the first 1,000 wear cycles, then reached a steady state, but material loss from the surface continued at a rate of 1,778,000 μm3 per million cycles as carbides were removed from its matrix. These carbides formed third-body wear particles, leading to the formation of new scratches even as older scratches were worn away. In contrast, no scratching, loss of material, or other surface damage, when evaluated with one nanometer resolution, was found on the surface of the ceramic components after a 15 M wear cycle test. Conclusion This study showed wear and loss of CoCr material from scratching and microabrasive wear in TKA. The material loss from the surface continued in a linear relationship with increasing cycles. We also found the absence of scratching and roughening of ceramic femoral components in simulated wear, suggesting an advantage in wear rate and avoiding metal sensitivity. This may have implications in the management of persistent pain after TKA. Cite this article: Bone Joint J 2021;103-B(6 Supple A):94–101.

scholarly journals Temporomandibular Joint (TMJ) Ankylosis Resection to Total Joint replacement – 30 Years Journey

2021 ◽  
Vol 33 (2) ◽  
Keyword(s):  
Temporomandibular Joint ◽  
Joint Replacement ◽  
Total Joint Replacement ◽  
Articular Surface ◽  
Mandibular Condyle ◽  
Mouth Opening ◽  
Patient Specific ◽  
Mandibular Fractures ◽  
Tmj Ankylosis ◽  
Condyle Fracture

Temporomandibular joint (TMJ) ankylosis is an intracapsular union of the disc–condyle complex to the temporal articular surface that confines the mandibular drive, including the fibrous adhesions/ bony fusion between condyle, disc, glenoid fossa, and eminence. It is a severe and incapacitating ailment that can cause mastication, digestion, speech, appearance, and hygiene concerns. This is an unusual case of a 42-year-old adult patient, who suffered from bilateral recurrent TMJ ankylosis and reported following trauma to the face. The patient had a history of mandibular condyle fracture at ten years of age. Excision of existing ankylotic mass followed by reconstruction with patient-specific total joint replacement (TJR) was carried out. Postoperative physiotherapy exercises in the presented case improved patient’s mouth opening, and mandibular movement. Patient-specific TJR procedures and postoperative physiotherapy will be helpful in cases with TMJ ankylosis. Keywords: Genioplasty; Mandibular Condyle; Mandibular fractures; Temporomandibular Ankylosis; Temporomandibular Joint

The effect of cup orientation on stability of trapeziometacarpal total joint arthroplasty: a biomechanical cadaver study

2019 ◽  
Vol 44 (7) ◽  
pp. 708-713 ◽  
Author(s):  
Annelien Brauns ◽  
Pieter Caekebeke ◽  
Joris Duerinckx
Keyword(s):  
Range Of Motion ◽  
Joint Replacement ◽  
Total Joint Arthroplasty ◽  
Total Joint Replacement ◽  
Articular Surface ◽  
Three Dimensional ◽  
Cadaver Study ◽  
Joint Arthroplasty ◽  
Joint Stability ◽  
Prosthetic Joint

It has been suggested that the cup of a trapeziometacarpal total joint replacement should be positioned parallel with the proximal articular surface of the trapezium to align it with the centre of motion. This would diminish the chance of dislocation. The goal of this study was to test this idea biomechanically. A linked trapeziometacarpal prosthesis was implanted in seven cadaver hands and combined with three-dimensional printed trapezium cups in 17 different orientations. For every combination, stability of the prosthesis was assessed through its entire passive range of motion. Dorsal inclination of the cup relative to the proximal articular surface increased the risk of dislocation with thumb flexion and opposition. The risk of dislocation was also increased with lateral or medial inclination of the cup exceeding 20°. Our results demonstrate that cup orientation is an important factor in prosthetic joint stability. Cup placement parallel to the proximal articular surface is ideal.

The Effect of Conformity and Plastic Thickness on Contact Stresses in Metal-Backed Plastic Implants

1985 ◽  
Vol 107 (3) ◽  
pp. 193-199 ◽  
Author(s):  
D. L. Bartel ◽  
A. H. Burstein ◽  
M. D. Toda ◽  
D. L. Edwards
Keyword(s):  
Finite Element ◽  
Joint Replacement ◽  
Total Joint Replacement ◽  
Surface Damage ◽  
Contact Stresses ◽  
Design Parameters ◽  
Finite Element Analyses ◽  
Elasticity Solution ◽  
Metal Backing ◽  
Contact Surfaces

Surface damage in polyethylene components for total joint replacement is associated with large contact stresses. An elasticity solution and finite element analyses were used to determine the influence of design parameters on the stresses due to contact in metal-backed components. For nearly conforming contact surfaces, it was found that the stresses in the plastic are very sensitive to clearance, that minimum plastic thickness of 4–6 mm should be maintained for metal-backed components, and that bonding the plastic to the metal backing reduces tensile stresses in the plastic at the edge of the contact zone.

scholarly journals Laboratory Characterization of In-Service Full-Mouth Rehabilitation with Monolithic Translucent Zirconia Restorations

Symmetry ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1755
Author(s):  
Susana M. Salazar Marocho ◽  
Mary Beth VanLandingham ◽  
Firas Mourad ◽  
Andres Pappa ◽  
Sreenivas Koka
Keyword(s):  
Surface Roughness ◽  
Surface Damage ◽  
Optical Microscope ◽  
Posterior Teeth ◽  
Golden Proportion ◽  
Laboratory Characterization ◽  
Full Mouth Rehabilitation ◽  
Zirconia Crowns

The chance to critically and microscopically inspect the quality of bonded restorations once they are delivered to the patient after several pre-cementation steps is rare or nonexistent. Replicas of in-service restorations can provide a wealth of information on the integrity of the restorations and moreover make it possible to bring this information to the laboratory for further detailed analysis. This study aimed to characterize the epoxy replicas of 27 cemented monolithic yttria-stabilized zirconia crowns of the maxillary and mandibular arch to assess surface roughness, topography, and symmetry. The topography of the facial, lingual, and occlusal/incisal surfaces of each crown was observed under the optical microscope and further characterized using the scanning electron microscope. Surface roughness measurements were performed using the atomic force microscope. The optical microscope was used to measure the golden proportion and visible width of the anterior maxillary crowns. Surface damage consistent with unpolished adjustment was identified mostly in the occlusal surface of the posterior teeth. Other irregularities, such as scratch marks, small pits, and coarse pits were also found. The surface roughness had great variability. Not all of the anterior maxillary and mandibular teeth followed the golden proportion concept. This study design allows in vitro characterization of in-service restorations. It provides a framework for using replicas for early identification of patterns or features that can trigger fracture and for analysis of morphology and symmetry.

Piroxicam spares buprenorphine after total joint replacement

1992 ◽  
Vol 63 (6) ◽  
pp. 658-660
Author(s):  
Michel Boeckstyns ◽  
Marianne Backer ◽  
Else Petersen ◽  
Iben Høj ◽  
Henrik Albrechtsen ◽  
...  
Keyword(s):  
Joint Replacement ◽  
Total Joint Replacement
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