Vliv odchylky postavení komponent na sérovou hladinu iontů kovů u pacientů s povrchovou náhradou kyčle
| Title in English | The influence of component position on metal ion levels after hip resurfacing |
|---|---|
| Authors | |
| Year of publication | 2012 |
| Type | Article in Periodical |
| Magazine / Source | Ortopedie |
| MU Faculty or unit | |
| Citation | |
| Field | Surgery incl. transplantology |
| Keywords | hip resurfacing; metal-metal bearings; serum; cobalt; chrome |
| Description | Introduction: The influence of component position on the serum level of cobalt (Co) and chrome (Cr) ions after hip resurfacing (SRA) is still controversial in orthopaedic literature. The aim of the study was to accept or refuse the hypothesis that the component position has an influence on Co and Cr ion levels in patients after hip SRA. Material and Methods: 34 patients with completed single-side SRA (ASR, DePuy) were included in the study. The mean time from surgery to blood sampling was 45 months (range 7 to 2 years). Cup inclination and anteversion and femoral component position in relation to the femoral neck axis were evaluated using x-rays. Mann-Whitney U test was used for statistical evaluation. Results: The mean Co serum level was 9.9 ppb (range, 0.5 – 147.9 ppb), modus 1.1 and median 1.2. The mean Cr serum level was 5.0 ppb (range, 0.0 – 73.6 ppb), modus 0.3 and median 0.9. Co ion level was lower than the critical 7 ppb in 28 patients (82.4%). Cr ion level was lower than 7 ppb in 30 patients (88.2%). The levels of both ions lower than 7 ppb was identified in 28 patients (82.4%). The correct position of the acetabular component in both planes (the range of inclination between 40deg. and 46deg. and anteversion between 10deg. and 16deg.) was achieved in 9 cases (26.5%). The correct position of the femoral component in both planes (up to 5deg. deviation) was achieved in 13 cases (38.2%). The correct position of both components in both planes was achieved in 4 cases (11.8%). The components position did not have a statistically significant influence on serum ion levels (p < 0.05). Conclusion: Serum metal ion levels after ASR hip replacements are not influenced by the acetabular and femoral component position. The hypothesis was refused. |