Bone adaptation impact of stemless shoulder implants: a computational analysis.

Area of Science:

• Orthopedic biomechanics
• Biomaterials engineering
• Skeletal adaptation research

Background:

• Stemless shoulder implants offer functional benefits but may cause bone resorption.
• Investigating stemless implant designs is crucial for understanding bone adaptation.
• Complications like bone resorption necessitate further study of implant designs.

Purpose of the Study:

• To analyze the impact of five stemless implant designs on humerus bone adaptation.
• To compare bone remodeling around different stemless shoulder arthroplasty systems.
• To evaluate the influence of implant-bone contact on bone density changes.

Main Methods:

• Developed 3D finite element models for five stemless shoulder arthroplasty designs.
• Simulated contact and no-contact conditions between implants and bone.
• Utilized a bone remodeling model with six standard shoulder movement load cases.

Main Results:

• Stemless implant design significantly affects humerus bone adaptation.
• Eclipse-based designs led to the most bone mass loss; SMR-based designs showed the least.
• Simulated contact between implants and bone increased bone resorption for SMR, Simpliciti, and Sidus designs.

Conclusions:

• The SMR-based stemless implant demonstrated superior bone adaptation performance.
• Avoiding direct contact between the humeral head component and resected bone is advisable.
• Further research is needed to consider additional factors for definitive recommendations.