The femoral component in low-friction arthroplasty after ten years.
In 623 low-friction arthroplasties ten years after implantation, 70 hips (18.04% after 16 years) showed loosening of the femoral component. Eighty-four percent appeared within ten years. Fracture of the stem occurred in 4.3% of cases after 16 years, and resorption over 5 mm of the femoral neck occurred in 9.3%. Calcar cysts appeared in 2.9% and endosteal cavitations in 18.04% after 16 years; both findings were related to acetabular wear greater than 2 mm. Gruen's Type III (calcar pivot) was the least common loosening (6.8%) during the first ten years. After this time its incidence increased to 17.1%. Loosening of the femoral component was not related to age, weight, or activity. It was, however, associated with poor surgical technique, i.e., varus position (46%), cementation defects (34%), and/or femoral neck osteotomy on the lesser trochanter (36%).
Munuera
L
L
Department of Orthopaedics, Hospital La Paz, Universidad Autónoma de Madrid, Spain.
Garcia-Cimbrelo
E
E
D000293:Adolescent; D000328:Adult; D000368:Aged; D001862:Bone Resorption / Q000000981:diagnostic imaging; D005260:Female; D005264:Femoral Fractures / Q000000981:diagnostic imaging; D005269:Femur / Q000000981:diagnostic imaging; D005500:Follow-Up Studies; D006621:Hip Joint / Q000000981:diagnostic imaging* / Q000502:physiology; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011475:Prosthesis Failure; D011859:Radiography; D016059:Range of Motion, Articular; D013997:Time Factors