Metasul vs Cerasul bearings: a prospective, randomized study at 9 years

Area of Science:

• Orthopedic Surgery
• Biomaterials Science
• Clinical Research

Background:

• Total hip arthroplasty (THA) utilizes bearing surfaces to facilitate joint articulation.
• Hard-on-hard bearings, such as metal-on-metal (Metasul) and ceramic-on-ceramic (Cerasul), are designed for durability.
• Comparative data on the long-term clinical and radiographic performance of these specific bearing types is crucial for surgical decision-making.

Purpose of the Study:

• To prospectively compare the clinical and radiographic outcomes of Metasul and Cerasul bearing surfaces in cementless primary total hip arthroplasties.
• To evaluate the 9-year survival rates of these two hard-on-hard bearing options.
• To determine if one bearing type demonstrates superior performance over the other.

Main Methods:

• A prospective, randomized study involving 250 patients undergoing cementless primary THA.
• Patients were randomized to receive either Metasul or Cerasul bearing surfaces (50% each).
• Comprehensive clinical and radiographic evaluations were performed, with no loss to follow-up over 9 years.

Main Results:

• Clinical outcomes were comparable between the Metasul and Cerasul groups.
• Radiographic results did not show significant differences between the two bearing types.
• The 9-year survival rate was 100% for Cerasul and 98.4% for Metasul, considering aseptic loosening as the failure endpoint.
• Overall 9-year survival rates were 99.2% for Cerasul and 97.6% for Metasul.

Conclusions:

• Both Metasul and Cerasul bearing surfaces demonstrate excellent clinical and radiographic performance in cementless primary total hip arthroplasty.
• Neither bearing type significantly outperformed the other over a 9-year follow-up period.
• High survival rates for both hard-on-hard bearing options suggest their suitability for THA, with comparable long-term efficacy.