Fatigue fracture of the femoral component in total knee replacement

Fracture of femoral component in total knee arthroplasty (TKA) has become a rare complication with improvements in metal alloy manufacturing technology. We report two cases of fracture of femoral components 9 and 10 years after primary TKA. The Buechel-Pappas (BP) knee system used in our two cases w...

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Published inThe knee Vol. 27; no. 5; pp. 1439 - 1445
Main Authors Chithartha, Karthik, Thilak, Jai, Sukesh, A.N., Theruvil, Bipin
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier B.V 01.10.2020
Elsevier Limited
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Abstract Fracture of femoral component in total knee arthroplasty (TKA) has become a rare complication with improvements in metal alloy manufacturing technology. We report two cases of fracture of femoral components 9 and 10 years after primary TKA. The Buechel-Pappas (BP) knee system used in our two cases were designed by the same team who designed the LCS TKA implants. The femoral component is made of cobalt chromium alloy. The break in the femoral component noted in both the cases were at a similar site, at the distal medial flange just posterior to the peg of the femoral component. Both these cases underwent revision surgery using stemmed implants with good results. Implants retrieved were analysed with Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) to study the fracture pattern and material properties respectively. Fractography analysis of both our cases showed that the crack initiated laterally from the thin edge (1mm) around the sharp angulated corner of the medial femoral condyle and spread medially towards the thicker segment. We feel two fractures of femoral component out of 9000 TKA in ten years is significant. We recommend a re-evaluation of the femoral component of the BP knee system to ensure that the edges, specifically the sharp corners, have adequate thickness to avoid a fatigue fracture.
AbstractList BackgroundFracture of femoral component in total knee arthroplasty (TKA) has become a rare complication with improvements in metal alloy manufacturing technology.MethodologyWe report two cases of fracture of femoral components 9 and 10 years after primary TKA. The Buechel-Pappas (BP) knee system used in our two cases were designed by the same team who designed the LCS TKA implants. The femoral component is made of cobalt chromium alloy. The break in the femoral component noted in both the cases were at a similar site, at the distal medial flange just posterior to the peg of the femoral component.ResultBoth these cases underwent revision surgery using stemmed implants with good results. Implants retrieved were analysed with Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) to study the fracture pattern and material properties respectively. Fractography analysis of both our cases showed that the crack initiated laterally from the thin edge (1mm) around the sharp angulated corner of the medial femoral condyle and spread medially towards the thicker segment.ConclusionWe feel two fractures of femoral component out of 9000 TKA in ten years is significant. We recommend a re-evaluation of the femoral component of the BP knee system to ensure that the edges, specifically the sharp corners, have adequate thickness to avoid a fatigue fracture.
Fracture of femoral component in total knee arthroplasty (TKA) has become a rare complication with improvements in metal alloy manufacturing technology. We report two cases of fracture of femoral components 9 and 10 years after primary TKA. The Buechel-Pappas (BP) knee system used in our two cases were designed by the same team who designed the LCS TKA implants. The femoral component is made of cobalt chromium alloy. The break in the femoral component noted in both the cases were at a similar site, at the distal medial flange just posterior to the peg of the femoral component. Both these cases underwent revision surgery using stemmed implants with good results. Implants retrieved were analysed with Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) to study the fracture pattern and material properties respectively. Fractography analysis of both our cases showed that the crack initiated laterally from the thin edge (1mm) around the sharp angulated corner of the medial femoral condyle and spread medially towards the thicker segment. We feel two fractures of femoral component out of 9000 TKA in ten years is significant. We recommend a re-evaluation of the femoral component of the BP knee system to ensure that the edges, specifically the sharp corners, have adequate thickness to avoid a fatigue fracture.
Author Thilak, Jai
Theruvil, Bipin
Sukesh, A.N.
Chithartha, Karthik
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Issue 5
Keywords SEM
Fatigue fracture
EDS
Fractography
Implant design
Femoral component
Language English
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Snippet Fracture of femoral component in total knee arthroplasty (TKA) has become a rare complication with improvements in metal alloy manufacturing technology. We...
BackgroundFracture of femoral component in total knee arthroplasty (TKA) has become a rare complication with improvements in metal alloy manufacturing...
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SubjectTerms Aged
Aged, 80 and over
Arthritis
Arthroplasty (knee)
Arthroplasty, Replacement, Knee
Asymptomatic
Chemical elements
Chromium
Chromium alloys
Cobalt
Crack propagation
Design
Failure analysis
Fatigue fracture
Female
Femoral component
Femur
Fractography
Fractures
Grain boundaries
Humans
Implant design
Knee
Knee Prosthesis - adverse effects
Male
Materials fatigue
Metal fatigue
Osteoarthritis
Pain
Prostheses
Prosthesis Failure
Reoperation
Scanning electron microscopy
Stress analysis
Surgery
Topography
Transplants & implants
Trauma
X-ray spectroscopy
Title Fatigue fracture of the femoral component in total knee replacement
URI https://dx.doi.org/10.1016/j.knee.2020.06.009
https://www.ncbi.nlm.nih.gov/pubmed/33010759
https://www.proquest.com/docview/2458952783
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