Mid-term outcomes using a 'kinematic retaining' total knee replacement - A multicentre prospective study at five...

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Clinical Outcomes Research

Background:

• Total knee replacement (TKR) aims to improve pain and deformity but patient satisfaction varies.
• A novel 'kinematic retaining' (KR) implant was developed to address incomplete patient outcomes.
• This study evaluates the survivorship and clinical efficacy of the KR implant.

Purpose of the Study:

• To assess the survivorship, clinical, and radiological outcomes of the Physica KR implant.
• To evaluate patient-reported outcomes and satisfaction following TKR with the KR implant.
• To determine the long-term effectiveness of kinematic retaining knee prostheses.

Main Methods:

• Prospective study of 156 patients undergoing TKR for primary osteoarthritis using the Physica KR implant.
• Five-year follow-up including radiographic and clinical evaluations.
• Assessment of Knee Society Score (KSS), Knee Injury and Osteoarthritis Outcome Score (KOOS), Oxford Knee Score (OKS), Visual Analogue Score (VAS) for satisfaction, and Forgotten Joint Score (FJS).

Main Results:

• High good-excellent clinical and functional KSS scores (79.4%-85.9% at 6 months, maintained at 76.9%-79.5% at 5 years).
• Significant improvements in KSS, KOOS, OKS, VAS satisfaction, and FJS were observed and maintained at 5 years.
• No progressive adverse radiographic features noted; low revision rate (2/156) for infection and aseptic loosening.

Conclusions:

• The novel kinematic retaining knee prosthesis demonstrates exceptional clinical and patient-reported improvements.
• The Physica KR implant shows a remarkable 99.4% survivorship at five years.
• This implant offers a promising solution for improving total knee replacement outcomes.