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Stress shielding resulting in diminished bone density following total knee replacement (TKR) may increase the risk of migration and loosening of the prosthesis. This retrospective study was designed to quantify the effects of the method of fixation on peri-prosthetic tibial bone density beneath cemented and uncemented tibial components of similar design and with similar long-term survival rates. Standard radiographs taken between two months and 15 years post-operatively were digitised from a matched group of TKRs using cemented (n = 67) and uncemented (n = 67) AGC tibial prostheses. Digital radiograph densitometry was used to quantify changes in bone density over time. Age, length of follow-up, gender, body mass index and alignment each significantly influenced the long-term pattern of peri-prosthetic bone density. Similar long-term changes in density irrespective of the method of fixation correlated well with the high rate of survival of this TKR at 20 years, and suggest that cemented and uncemented fixation are both equally viable.

Original publication

DOI

10.1302/0301-620X.95B7.30537

Type

Journal article

Journal

Bone joint j

Publication Date

07/2013

Volume

95-B

Pages

911 - 916

Keywords

BMD, Bone density, Cement, Radiographs, Stress shielding, Tibia, Adolescent, Adult, Aged, Aged, 80 and over, Arthroplasty, Replacement, Knee, Bone Cements, Bone Density, Cementation, Female, Follow-Up Studies, Humans, Knee Joint, Knee Prosthesis, Male, Middle Aged, Prosthesis Design, Prosthesis Failure, Radiography, Retrospective Studies, Survival Rate, Tibia, Treatment Outcome, Young Adult