title: Is bone density in the distal femur affected by use of cement and by femoral component design in total knee arthroplasty?
abstract: The objective of this study was to evaluate changes in bone density in the distal femur 2 years after total knee arthroplasty with four different implant designs using cemented or cementless femoral components. Bone density was measured retrospectively from radiographs of 114 knees, using a densitometer. A decrease in bone density of up to 57% was identified in the distal femora with a cemented femoral component 2 years after surgery, compared with a decrease of up to 28% with a cementless, porous-coated component of the same design. The differences between the four implant designs in the changes in bone density in the anterior distal femur were significant at 2 years (P < 0.001). A possible cause of this result may be a difference in load transfer due to the different methods of fixation. The surgeon should expect decreased bone density in the distal femur at the time of revision surgery, especially with a cemented femoral component.
authors.affiliation: Department of Orthopaedic Surgery, Niigata University, 757 banchi, 1-Bancho, Asahimachi-dori, Niigata 951-8510, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Seki
authors.forename: G
authors.initials: G
authors.lastname: Omori
authors.forename: Y
authors.initials: Y
authors.lastname: Koga
authors.forename: Y
authors.initials: Y
authors.lastname: Suzuki
authors.forename: Y
authors.initials: Y
authors.lastname: Ishii
authors.forename: H E
authors.initials: HE
authors.lastname: Takahashi
mesh_terms: D015502:Absorptiometry, Photon; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D001843:Bone Cements; D015519:Bone Density; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging / Q000378:metabolism*; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000601:surgery; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D012189:Retrospective Studies
chemical_list: D001843:Bone Cements