Radiographic assessment of uncemented humeral components in total shoulder arthroplasty.
Seventy-two total shoulder arthroplasties performed using Neer II press-fit humeral components and followed for an average of 4.1 years (range, 2-7.8 years) were analyzed radiographically. A humeral component was considered radiographically at risk for clinical loosening when a radiolucent line > or =2 mm in width was present in > or =3 zones or tilt or subsidence was identified on sequential radiographs by 2 of 3 or 3 of 3 independent observers. Forty components (55.6%) were judged to be at risk. There were no identifiable characteristics associated with the development of an at-risk humeral component except longer average follow-up of the at-risk group (4.7 years vs 3.3 years, P =.001). Humeral components at risk had a higher rate of endosteal erosion (P =.04) and greater number of zones with sclerosis. Radiographic changes around Neer II uncemented humeral components are common. Data from this study can be used as 1 benchmark to compare with alternate methods of humeral component fixation.
Department of Orthopedic Surgery, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA.
J
J
Sanchez-Sotelo
T W
TW
Wright
S W
SW
O'Driscoll
R H
RH
Cofield
C M
CM
Rowland
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019643:Arthroplasty, Replacement / Q000379:methods*; D005260:Female; D006801:Humans; D006811:Humerus / Q000000981:diagnostic imaging* / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D011475:Prosthesis Failure; D019919:Prosthesis Implantation / Q000379:methods*; D011859:Radiography; D012785:Shoulder Joint / Q000000981:diagnostic imaging* / Q000601:surgery*; D018709:Statistics, Nonparametric; D016896:Treatment Outcome