Abstract
For many years we have been following Savastano's hemicompartmental replacements which were executed for OA limited to the compartment of a knee. This time we studied the results have passed since operation in cases in which more than five years, and reported them with some remarks.
The numbers of total cases which had the Savastano-type artificial knee, 19 knee joints in 18cases, i.e., 11 knee joints in 11 cases for women and 8 knee joints in 7 cases for men, and 17 inside knee joints and 2 outside knee joints. The average age at the time of operation was 62.5. The follow-up period was 2 to 7 years. For the group within 5 years after the operation (A group) and the group more than 5 years (B group), we made functional evaluauion by three university trial plans, disorder of the clear zone and of wire marker on X-ray and changes such as tibial plateau sinking and artificial knee loosening.
About 80% of cases within 5 years showed satisfactory results, the evaluation score of knee joint function was 80% or above; however, for the group of more than 5 years, FTA return, increases in movable zone limitation, etc., were observed. Loosening occurred on 3 out of 7 cases and revision was executed on 2 cases, with 1 case pending.
The discover what was behined the
1 Case factors (weight and activity degree on ADL)
2 Indications (OA of other components and development degree)
3 Prosthetic factors (supportability of tibial prosthesis against load)
The component replacement cases for the outside knee joint showed satisfactory results compared with the cases for the inside knee joint. However, more follow-up investigation will be necessary.
Although the short-term result of hemicompartment arthroplasty has a relatively satisfactory result, the long-term result has problems, and therefore, we must be careful about its application.
