Can TKA design affect the clinical outcome? Comparison between two guided-motion systems

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering

Background:

• Total knee arthroplasty (TKA) is a common procedure for end-stage knee osteoarthritis.
• Implant design is a critical factor influencing TKA outcomes.
• Guided-motion TKA designs aim to replicate natural knee kinematics.

Purpose of the Study:

• To compare clinical and functional outcomes between two different fixed-bearing guided-motion TKA implant designs.
• To evaluate the influence of implant design on patient satisfaction and range of motion after primary TKA.

Main Methods:

• Retrospective comparative analysis of 227 computer-assisted primary TKAs performed between 2007 and 2009.
• Patients received either the Scorpio Non-Restrictive Geometry (NRG) or Journey Bi-Cruciate Stabilized (BCS) knee system.
• Data analyzed from 180 patients (187 knees) at a mean follow-up of 29 months.

Main Results:

• No significant preoperative differences in demographics, range of motion (ROM), or alignment between the Scorpio NRG and Journey BCS groups.
• The Journey BCS group demonstrated significantly higher Knee Injury and Osteoarthritis Outcome Score (KOOS) pain and knee-related quality of life subscales.
• The Journey BCS group also showed significantly greater postoperative ROM compared to the Scorpio NRG group.

Conclusions:

• Implant design, specifically bearing geometry and kinematic patterns, influences clinical-functional outcomes in primary TKA.
• The Journey BCS guided-motion TKA design may offer superior pain relief and functional recovery compared to the Scorpio NRG design.
• Different TKA designs can also influence the type and incidence of postoperative complications.