Dual mobility acetabular cup for total hip arthroplasty: use with caution

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering

Background:

• Dual-mobility cups were developed to decrease dislocation rates in total hip arthroplasty (THA).
• Their biomechanics offer improved range of motion and stability compared to conventional cups.
• They are particularly useful in high-risk THA cases, including elderly, obese, or revision patients.

Purpose of the Study:

• To review the biomechanics and clinical outcomes of dual-mobility cups in THA.
• To assess their efficacy in primary, revision, and hip fracture THA procedures.
• To identify current concerns and areas for future research.

Main Methods:

• An extensive literature search was performed on PubMed and Google Scholar for relevant publications from the past five years.
• 225 articles were identified, with exclusions based on language, duplication, availability, and relevance.
• The remaining articles were categorized by biomechanics, primary THA outcomes, revision THA outcomes, and hip fracture THA outcomes.

Main Results:

• Dual-mobility cups demonstrate a significant role in managing recurrent instability and reducing instability in high-risk primary THA patients.
• Evidence supports their benefit in improving stability and range of motion.
• The review identified key areas of biomechanics, primary, revision, and hip fracture THA outcomes.

Conclusions:

• Dual-mobility cups are effective in reducing instability in total hip arthroplasty, especially in high-risk populations.
• Concerns regarding metal ion release, particularly in younger patients, and prosthetic malfunction require further investigation.
• Continued research is needed to optimize the use of dual-mobility cups and address potential complications.