Retrieval Studies

THA Revision (2 years post-op)

THA Revision (2 years post-op). Due to aseptic loosening, a THA was revised. The titanium-alloy femoral stem was explanted broken at an oblique cross-section, falling within the porous-coated region. Retrieval study comprised detailed measurement of implant contour with respect to anatomical x-ray data and multi-parametric analysis of material characteristics. Titanium-alloy fatigue was determined as the cause of fracture.

THA Revision (2 years post-op)
Due to aseptic loosening, a THA was revised. The titanium-alloy femoral stem was explanted broken at an oblique cross-section, falling within the porous-coated region. Retrieval study comprised detailed measurement of implant contour with respect to anatomical x-ray data and multi-parametric analysis of material characteristics. Titanium-alloy fatigue was determined as the cause of fracture.

TKA Revision (2 years post-op)

TKA Revision (2 years post-op). A constrained design TKA was revised 2 yrs post-op, due to functional stiffness. A retrieval study was conducted in order to investigate information accumulated by in vivo service in all implants. A detailed 3D design of the implantable system was undertaken; followed by subsequent meticulous step-by-step biomechanical analysis of loading trends. Thus, analytical and observational retrieval findings were explained and fully documented.

TKA Revision (2 years post-op) 

A constrained design TKA was revised 2 yrs post-op, due to functional stiffness. A retrieval study was conducted to investigate information due to in vivo service. A detailed 3D design of the implantable system was undertaken; followed by subsequent meticulous step-by-step biomechanical analysis of loading trends. Thus, analytical and observational retrieval findings were explained and fully documented. 

TKA Revision (12 years post-op)

TKA Revision (12 years post-op). A TKA was revised 12 yrs post-op, due to malalignment and associated excessive wear of all endoprosthetic parts. Full-thickness material removal was demonstrated by both the UHMWPE (polyethylene) tibial insert and the titanium-alloy tibial tray. Migrated cobalt-chrome-alloy beads from the coating of the femoral component were found embedded in polyethylene and also considered responsible for indentations and traces on the articular aspect of the femoral condyles.  

TKA Revision (12 years post-op)
A TKA was revised due to malalignment and associated excessive wear of all endoprosthetic parts. Full-thickness material removal was demonstrated by both the UHMWPE (polyethylene) tibial insert and the titanium-alloy tibial tray. Migrated Co-Cr beads from the coating of the femoral component were found embedded in polyethylene and were responsible for indentations on the femoral condyles.

TKA Revision (4 years post-op)

Revision (4 years post-op) of a Total Knee Arthroplasty (TKA). The medial condyle of a right-side uncemented porous-coated femoral component fractured due to fatigue just anteriorly the fixation peg.

TKA Revision (4 years post-op)
The medial condyle of a right-side uncemented porous-coated femoral component fractured due to fatigue just anteriorly the fixation peg.

TKA Revision (14 years post-op)

Revision (14 years post-op) of a Total Knee Arthroplasty (TKA). The UHMWPE (polyethylene) insert demonstrates various material degradation modes, which are topographically recognized, traced and quantified (pitting, scratches, deformation, delamination and localized material loss).

TKA Revision (14 years post-op)
 
The UHMWPE (polyethylene) insert demonstrates various material degradation modes, which are topographically recognized, traced and quantified, such as pitting, scratches, deformation, delamination, localized material loss.                               

TKA Revision (11 years post-op)

Revision (11 years post-op) of a Total Knee Arthroplasty (TKA). The titanium tibial tray and the UHMWPE (polyethylene) insert demonstrate excessive wear, material loss and cracking, caused by aggressive contact with cobalt-chrome femoral condyles.

TKA Revision (11 years post-op)
The titanium tibial tray and the UHMWPE (polyethylene) insert demonstrate excessive wear, material loss and cracking, caused by aggressive contact with cobalt-chrome femoral condyles.