The uncemented fully textured Lord hip prosthesis: a 10- to 15-year followup study.
One hundred fourteen total hip arthroplasties in 110 patients performed between 1979 and 1983 using the Lord femoral component were analyzed. Nine femoral revisions were performed within 13 years after surgery (two because of infection). Excluding infections there was a 94% 13-year survival according to a Kaplan-Meier analysis. Subsidence was seen in five hips (five patients), but only one needed revision surgery. Seventy-six hips (73 patients) had a radiographic followup of 10 years or more and were analyzed in detail. Changes in cortical thickness, density, and formation of spotwelds continued beyond 5 years after surgery, meaning the remodeling of periprosthetic bone continued beyond that time. Osteolysis on the femoral side was seen in seven hips, always in the proximal part of the femur, apparently as a continuation of the joint space. No remote focal osteolysis was seen. Elderly patients, women, and patients with a pedestal were overrepresented among individuals with many spotwelds. For the clinical outcome the Merle d'Aubigne and Postel score as modified by Charnley was used. Among 69 hips (66 patients) with a mean followup of 153 months 96% (66 hips) had a pain score equal to or greater than 4 and 74% (51 hips) had a score of 5 or 6. The Lord femoral component gave surprisingly good clinical long term results despite the bone remodeling (stress shielding), which in some cases was pronounced. The most obvious disadvantage with this design appears to be the difficulties associated with its removal when indicated.
Keisu
K S
KS
Karolinska Institute, Huddinge University Hospital, Sweden.
Mathiesen
E B
EB
Lindgren
J U
JU
D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects; D016723:Bone Remodeling / Q000502:physiology; D002484:Cementation; D016009:Chi-Square Distribution; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging / Q000503:physiopathology; D005500:Follow-Up Studies; D006622:Hip Prosthesis / Q000009:adverse effects; D006801:Humans; D008297:Male; D008875:Middle Aged; D010014:Osteolysis / Q000209:etiology; D010147:Pain Measurement; D011474:Prosthesis Design / Q000009:adverse effects; D011475:Prosthesis Failure; D016459:Prosthesis-Related Infections / Q000209:etiology; D011859:Radiography; D012086:Reoperation; D012189:Retrospective Studies; D012737:Sex Factors; D018709:Statistics, Nonparametric; D013314:Stress, Mechanical; D013499:Surface Properties; D016019:Survival Analysis; D016896:Treatment Outcome