Computer-assisted technique to delineate osteolytic lesions around the femoral component in total hip arthroplasty.
There are currently no ideal quantitative measures assessing osteolysis after total joint arthroplasty. This study reports a new approach for quantification of osteolytic lesions on radiographs of total hip arthroplasty with the hypothesis that computer-assisted lesion quantification improves analysis precision over currently used qualitative visual assessment and thus improves progression monitoring. Duplicate exposure sets of anterior-posterior and frog-leg view radiographs of 15 volunteer total hip arthroplasty patients with radiographically evident periprosthetic lucencies were used. Two independent readers delineated the lesions using on-screen digital marker tools. Based on duplicate readings of the first exposure set only, intraoperator precision had a coefficient of variation (CV) from 1.5% to 3.4%, whereas interoperator precision CV ranged from 3.2% to 4.6%. The reproducibility of the x-ray technique as assessed by single readings of both sets of x-rays was CV 3.2% to 4.8%. The new technique compares favorably to precision of qualitative visual assessment and permits more accurate detection and quantitation of osteolytic lesions.
Prevrhal
Sven
S
Department of Radiology, University of California, San Francisco, California 94107, USA.
Klifa
Catherine S
CS
Shepherd
John A
JA
Ries
Michael D
MD
Genant
Harry K
HK
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D003936:Diagnosis, Computer-Assisted / Q000379:methods; D018450:Disease Progression; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging* / Q000473:pathology*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D010014:Osteolysis / Q000000981:diagnostic imaging* / Q000209:etiology*; D011859:Radiography; D015203:Reproducibility of Results