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Ceramic coating improves tibial component fixation in total knee arthroplasty
L Regnér1, L Carlsson, J Kärrholm
1Department of Orthopaedics, Institute of Surgical Sciences, Sahlgrenska University Hospital, Göteborg University, Sweden.
This study compared coated and uncoated tibial components in total knee replacements. Forty procedures were performed on 36 patients, with half receiving a hydroxyapatite/tricalcium phosphate coating on the titanium undersurface. Patients were followed for 2 years using radiostereometric analysis. The coated group showed less movement and fewer radiolucent lines, suggesting better stability. Clinical results were similar between groups. These findings suggest that HA/TCP coating may improve early fixation and interface quality in tibial components.
Area of Science:
- Orthopedic surgery
- Joint replacement outcomes research
- Biocompatible material applications
Background:
Uncemented total knee arthroplasty relies on bone ingrowth for long-term fixation. Prior research has shown that surface modifications can influence osseointegration. However, the role of hydroxyapatite/tricalcium phosphate coatings in tibial component stability remains unclear. No prior work had resolved the extent to which such coatings affect subsidence or tilt. This gap motivated a study to compare coated and uncoated implants. The Miller-Galante II design has been used in clinical trials. Radiostereometric analysis provides precise motion tracking. The need for improved interface quality remains a clinical challenge. This study aimed to address these uncertainties.
Purpose Of The Study:
The goal was to assess whether hydroxyapatite/tricalcium phosphate coating improves tibial component fixation. The Miller-Galante II prosthesis was used in 40 procedures. Patients were randomly assigned to coated or uncoated groups. The study focused on stability and interface quality. Radiostereometric analysis was selected for its precision. The 2-year follow-up period was chosen to observe early outcomes. The titanium fiber mesh served as the baseline surface. This design allowed for direct comparison of fixation properties.
Main Methods:
Forty total knee arthroplasties were performed on 36 patients. The tibial component undersurface was either coated or uncoated. The coating consisted of hydroxyapatite and tricalcium phosphate. Randomization ensured balanced group sizes. Radiostereometric analysis tracked component motion. Follow-up occurred at 2 years post-surgery. The Miller-Galante II prosthesis was standardized across cases. Motion parameters included anterior-posterior tilt and subsidence.
Main Results:
After 2 years, the coated group showed reduced anterior-posterior tilt. Subsidence was also less in the HA/TCP group. The mean maximal total point motion was 0.5 mm in both groups. Radiolucent lines were more frequent in the uncoated group. These lines appeared under the tibial tray and around the stem. Clinical outcomes remained similar between groups. The interface quality seemed better in the coated group. These findings suggest improved stability with HA/TCP coating.
Conclusions:
HA/TCP coating on the tibial component undersurface improved stability. The coated group had less tilt and subsidence at 2 years. Interface quality appeared better in the coated group. Radiolucent lines were more common in the uncoated group. Clinical results did not differ between groups. The coating may enhance early fixation properties. These findings support the use of HA/TCP in this context. The study highlights the potential of surface modifications.
Frequently Asked Questions
The HA/TCP coating reduced anterior-posterior tilt and subsidence at 2 years.
Radiostereometric analysis tracked motion with a precision of 0.5 mm.
It provided a standard surface for comparing coated and uncoated implants.
They suggest possible loosening or poor interface quality in the uncoated group.
No, clinical results were similar despite differences in radiographic findings.
HA/TCP coating may improve early stability and interface quality in tibial components.