Force analysis of three-dimensional finite element models for single radius and multi radius prostheses during flexion and extension in total knee arthroplasty

• Both single radius and multi radius prostheses can meet clinical needs, but selection should be individualized based on patient factors. • Single radius prostheses exhibit larger contact areas and lower stresses at low to medium flexion angles, potentially reducing wear risk. • Multi radius prostheses show lower stresses at high flexion angles, possibly due to posterior condyle design, but may have smaller contact areas. • Finite element analysis provides valuable biomechanical insights for optimizing prosthesis design and clinical decision-making.