A 12- to 18-year radiographic follow-up study of Charnley low-friction arthroplasty. The role of the center of rotation.
In a 12- to 18-year radiographic follow-up study of 95 Charnley low-friction total hip arthroplasties (THA), there was a statistically significant correlation between location of the center of rotation of the total hip prosthesis (notably the element horizontal distance cup to tear-drop) and long-term, unfavorable, radiographic signs, such as acetabular and stem demarcation, cup wear, cup migration, subsidence of the stem, and calcar resorption. Small differences, as little as 2 mm, in the placement of the cup in relation to anatomic landmarks were responsible for these findings. A logistical regression analysis showed that the horizontal distance cup to teardrop was the most significant parameter influencing long-term unfavorable radiographic signs of a THA in comparison with the parameters of age, gender, diagnosis, and body-weight.
Karachalios
T
T
Department of Orthopaedics, Athens University, KAT Hospital, Greece.
Hartofilakidis
G
G
Zacharakis
N
N
Tsekoura
M
M
D000077:Acetabulum / Q000000981:diagnostic imaging; D000367:Age Factors; D001696:Biomechanical Phenomena; D001835:Body Weight; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging; D005500:Follow-Up Studies; D006621:Hip Joint / Q000000981:diagnostic imaging* / Q000502:physiology; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D011859:Radiography; D012737:Sex Factors