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A formula for instability-related bone loss: estimating glenoid width and redefining bare spot
Zhongkai Ren1, Fengkun Wang2, Xiaohong Huang3
1Department of Sports Medicine, Affiliated Hospital of Qingdao University, Qingdao, Shandong, China.
International Orthopaedics
|February 1, 2024
Summary
A new rh formula accurately predicts glenoid bone loss using native glenoid width and height. This method offers superior accuracy for preoperative assessment of glenoid deficiency compared to the traditional anterior-posterior method.
Area of Science:
- Orthopedic Surgery
- Radiology
- Biomechanical Engineering
Background:
- Glenoid deficiency is a common complication in shoulder instability, often requiring surgical correction.
- Accurate preoperative assessment of glenoid bone loss is crucial for successful surgical planning and outcomes.
- Current methods for assessing glenoid defect ratio have limitations in accuracy and reliability.
Purpose of the Study:
- To introduce and validate a novel, intuitive method for preoperatively assessing the defect ratio in glenoid deficiency.
- To establish a linear relationship (rh formula) between native glenoid width and height for defect assessment.
- To compare the accuracy and reliability of the rh formula against the conventional anterior-posterior (AP) method.
Main Methods:
- A cadaver cohort (n=204) was used to establish the rh formula based on native glenoid width (2r) and height (h).
- The reliability of the rh formula was validated using 280 3D-CT scans of intact glenoids.
- Sixty-five anterior-inferior glenoid defect models were artificially created from 3D-CT images to evaluate the formula's accuracy in estimating bone loss.
- The rh formula's performance was compared with the standard AP method.
Main Results:
- A significant linear relationship was found between intact glenoid width and height (2r = 0.768 × h - 1.222 mm, R²=0.820, p<0.001).
- The rh formula demonstrated excellent reliability in predicting native glenoid width (ICC=0.911) and excellent agreement with defect ratio models (ICC=0.997).
- The rh formula showed higher accuracy in assessing glenoid width (ICC=0.967) and defect ratio (ICC=0.997) compared to the AP method (ICC=0.933 and ICC=0.911, respectively).
Conclusions:
- The cadaver-derived rh formula accurately predicts native glenoid width on 3D-CT scans.
- This formula provides a reliable and accurate method for redefining the bare spot and assessing glenoid bone loss preoperatively.
- The rh formula offers a technically superior alternative to the AP method for evaluating glenoid deficiency.
