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Published on: November 27, 2017
A three-dimensional measurement approach for the morphology of the femoral head
Charys M Martin1, James G Turgeon, Aashish Goela
1Department of Cellular Biology & Anatomy, Medical College of Georgia, Georgia Regents University, Augusta, GA, USA.
Insights
This study introduces a novel 3D digital method to accurately measure femoral head morphology, improving early diagnosis and treatment of hip osteoarthritis and related pathologies.
Area of Science:
- Orthopedics and Radiology
- Biomedical Engineering
- Medical Imaging Analysis
Background:
- Osteoarthritis frequently affects the hip joint, necessitating improved diagnostic tools.
- Current 2D radiographic measures for hip morphology lack precision and fail to leverage 3D imaging data.
- A reliable method for quantifying femoral head surface geometry is crucial for early diagnosis and treatment.
Purpose of the Study:
- To develop and validate a novel 3D digital method for quantifying femoral head morphology.
- To assess the reliability and accuracy of this new measurement approach.
Main Methods:
- A novel 3D measurement approach was applied to CT scans of 45 cadaveric femurs.
- Digital 3D models were created from CT data for analysis.
- Intraobserver and interobserver reliability were assessed using intraclass correlation coefficients (ICC).
Main Results:
- The digital measurement approach demonstrated excellent intraobserver (ICC = 0.99) and interobserver (ICC = 0.98) reliability.
- The mean difference between cadaveric and digital measures was -2.04 mm, with narrow confidence limits.
- The method accurately quantifies 3D surface geometry and individual variations of the femoral head.
Conclusions:
- The novel digital measurement approach provides a valid and reliable method for quantifying femoral head 3D surface geometry.
- This technique can aid in the early detection of hip pathologies and individual variations.
- It holds potential for future development of diagnostic measurements for hip and head-neck junction pathologies.
Abstract:
The hip joint is one of the most frequent sites of osteoarthritis. Advances in diagnosis and clinical treatment have progressed dramatically in the last few decades; however, there are limitations associated with the lack of reliable measures for quantifying hip joint morphology. Current diagnostic measures of the hip are performed with pre-determined measures, typically lengths and angles, on 2D radiographic planes. The current measurement techniques do not utilize the inherent 3D nature of CT and MR imaging and do not necessarily quantify the relevant clinical pathologies. A valid and reliable measurement modality that measures the surface geometry of the femoral head is necessary for early diagnosis and treatment of hip disease. The purpose of this study was to establish a method to quantify femoral head morphology using a three-dimensional model. A novel measurement approach was applied to 45 cadaveric femurs (23 right; 22 left; nine female, 17 male) and their digitally reconstructed 3D CT models. The mean difference between the cadaveric and digital measures was -2.04 mm with 95% confidence limits (CI) of 13.67 mm and -17.75 mm, respectively. The digital measurement approach was found to have excellent intraobserver reliability (ICC = 0.99, CI 0.98-0.99) and interobserver reliability (ICC = 0.98, CI 0.93-0.99). This valid and reliable novel digital measurement approach enables quantification of the 3D surface geometry of the femoral head and is able to measure individual variations and potentially detect abnormalities. This method may be used to assist future studies to establish valid diagnostic measurements for femoral head and head-neck junction pathologies.
