Excellent long-term outcomes with an anatomic cementless stem (SPS Evolution) designed using a CT-scan database and...

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Reconstructive Surgery

Background:

• The SPS Evolution™ stem, with its unique helicoidal torsion and double sagittal curvature, has shown improved hip reconstruction accuracy compared to standard stems.
• Long-term outcomes (10-year) of this specific anatomic stem in total hip arthroplasty (THA) have not been previously analyzed.

Purpose of the Study:

• To evaluate the ten-year survivorship and clinical outcomes of the SPS Evolution™ anatomic stem in patients undergoing THA.
• To assess the long-term fixation, stability, and patient-reported functional scores associated with this implant design.

Main Methods:

• A prospective cohort study included 134 patients undergoing THA between 2011-2013, using the SPS Evolution™ stem and cementless acetabular components.
• 102 patients (118 hips) were evaluated at a mean of 10.6 years using Harris Hip Score (HHS) and Oxford Hip Score (OHS).
• Femoral stem fixation and stability were assessed using Engh and ARA scores.

Main Results:

• The 10-year survival rate, with aseptic loosening as the endpoint, was 100% (95% CI, 96.7-100%) for the 118 hips.
• Excellent clinical outcomes were reported: mean HHS of 97.6 and mean OHS of 44.9.
• All stems demonstrated stable fixation and good osseointegration, with no cases of stress shielding or significant thigh pain reported.

Conclusions:

• The SPS Evolution™ stem achieves excellent ten-year survival rates in THA.
• The implant provides precise hip reconstruction with superior clinical and radiological outcomes.
• SPS Evolution™ is a reliable and conservative implant choice for total hip arthroplasty.