Quantitative analysis of UHMWPE wear debris isolated from the periprosthetic femoral tissues from a series of Charnley total hip arthroplasties.
Submicrometer and micrometer-sized UHMWPE wear particles have been associated with osteolysis and failure of total hip replacements. A previous study by Tipper et al. examined the wear debris isolated from the acetabular periprosthetic tissues from 18 Charnley total hip replacements, and compared this data to the tribological variables of the prostheses. The present study aimed to isolate the UHMWPE wear debris from the femoral periprosthetic tissues from 10 of the same cohort of patients, and compare it with the debris isolated from the corresponding acetabular tissues. A variety of particle morphologies were observed, discrete submicrometer particles, along with flakes and fibrils. The particle size distributions ranged from 0.1 to >250 microm, however, the largest particles were only found in samples when the femoral head damage was characterised as low (R(pm) < 0.2 microm). The mode of the frequency distribution of particles was in the range of 0.1-0.5 microm for all the femoral tissues. Considerable variations were found in the mass distributions of the wear particles as a function of size for different patients. The net mass of debris isolated from the femoral tissues was significantly lower (p < 0.05, Student's t-test) than from the corresponding acetabular tissues. This along with considerable spatial variation in the net mass of debris isolated from the different regions of the same sample of acetabular tissue, indicates that the transportation of the debris has a marked effect on the net mass of debris accumulated in different tissues.
Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, LS2 9JT, UK.
J
J
Bell
J L
JL
Tipper
E
E
Ingham
M H
MH
Stone
B M
BM
Wroblewski
J
J
Fisher
D000077:Acetabulum / Q000737:chemistry / Q000648:ultrastructure*; D019544:Equipment Failure Analysis / Q000379:methods*; D005270:Femur Head / Q000737:chemistry / Q000648:ultrastructure*; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008422:Materials Testing / Q000379:methods*; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D011095:Polyethylenes / Q000032:analysis* / Q000737:chemistry; D012086:Reoperation; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D011095:Polyethylenes; C111601:ultra-high molecular weight polyethylene