ABSTRACT
Fifty-six consecutive revised total knee arthroplasties (TKA) were followed for an average of 8.3 years (range: 3 to 15 years). The purpose of this study was to evaluate the results of revision TKA to determine any trends in either the good outcomes or the failures. We found that the success rate for revision TKA was comparable to that for primary TKA. Eighty-nine percent of the knees rated at least fair, with 73% of these rating good or excellent, and 4% poor result. Moreover, the findings suggest that if prostheses are aligned correctly at implantation, there is only slight deterioration in their performance over time. Outcome was not affected by the type of prosthesis used in either the previous surgery or the revision. There is a correlation between the number of revisions and the functional knee rating; the more revisions, the less chance for success. There was also a direct correlation between varus knee alignment and significant increased incidence of failure. No appreciable difference was found between degenerative arthritis patients and rheumatoid patients, except that the rheumatoid patients had a higher incidence of delayed infections.
Subject(s)
Arthritis, Rheumatoid/surgery , Knee Joint/surgery , Knee Prosthesis , Osteoarthritis/surgery , Postoperative Complications/etiology , Adolescent , Adult , Aged , Aged, 80 and over , Child , Female , Humans , Male , Middle Aged , Postoperative Complications/surgery , Prosthesis Design , Prosthesis Failure , Reoperation , Retrospective Studies , Treatment FailureSubject(s)
Joint Prosthesis , Meningeal Neoplasms/diagnosis , Meningioma/diagnosis , Aged , Aged, 80 and over , Diagnostic Imaging , Female , Humans , Male , Meningeal Neoplasms/pathology , Meningeal Neoplasms/surgery , Meningioma/pathology , Meningioma/surgery , Postoperative Complications/diagnosisABSTRACT
On twenty-six cemented total hip replacements that had been followed for an average of 10.4 years (range, nine to thirteen years), a retrospective radiographic study was done to assess dimensional changes in the cross section of the bone in a group of asymptomatic patients. Cortical dimensions were measured on radiographs and were normalized using a radiographic distortion factor that was derived from the width and length of the prosthesis. The data were then analyzed using a least-squares method. Analyses were performed for the men, for the women, and for the combined group. The results for all three groups showed a significant decrease in cortical thickness as well as widening of the medullary canal, but no periosteal expansion.
