Nonstandard glenoid components for bone deficiencies in shoulder arthroplasty

Area of Science:

• Orthopedic Surgery
• Biomaterials Engineering
• Radiology

Background:

• Glenoid bone deficiencies present challenges in shoulder arthroplasty.
• Specialized nonstandard glenoid components aim to address these bone defects.

Purpose of the Study:

• To evaluate clinical and radiographic outcomes of three distinct nonstandard glenoid components.
• Assess the efficacy of these components in managing glenoid bone deficiencies.

Main Methods:

• Retrospective analysis of 38 patients undergoing primary or revision anatomic shoulder arthroplasty.
• Utilized three types of nonstandard glenoid components: angled keel, extra-thick polyethylene, and posteriorly augmented metal-backed.
• Follow-up averaged 7.3 years, including clinical assessment and radiographic evaluation.

Main Results:

• Significant improvements in mean shoulder elevation (91° to 126°) and external rotation (24° to 53°).
• Component loosening occurred in 3 cases, with 3 more at risk; 7 patients required revision surgery.
• Ten-year survival rates varied significantly by component type, with the posteriorly augmented component showing the lowest survival (31%).

Conclusions:

• Nonstandard glenoid components offer functional improvements but are associated with increased loosening rates.
• Partial success in eliminating subluxation and high revision rates compromise the overall effectiveness.
• Component design and specific bone deficiency type influence long-term outcomes and survival.