Related Experiment Video
Updated: Jun 5, 2026
09:01
Treatment of Ankle Osteoarthritis with Total Ankle Replacement Through a Lateral Transfibular Approach
Published on: January 24, 2018
Talar Center of Migration Ratio (TCM-R) as a Reliable Ratio-Based Method for Measuring Talar Translation on
Kira Lu1, Ricardo Ummen de Almeida Tenório Villar2, Samantha Morton1
1Foot & Ankle Department, Hospital for Special Surgery, New York, NY, USA.
Foot & Ankle Orthopaedics
|June 4, 2026
Summary
A new method, TCM-Ratio (TCM-R), accurately measures coronal talar translation in ankle arthritis using noncalibrated radiographs. This innovative technique shows excellent reliability and strong correlation with existing methods, aiding total ankle replacement (TAR) surgery.
Area of Science:
- Orthopedics
- Radiology
- Biomechanical Engineering
Background:
- Coronal talar translation is a key indicator of deformity in ankle arthritis, crucial for successful total ankle replacement (TAR).
- Current measurement methods, like the talar center of migration (TCM), may face limitations with varying talar sizes.
- Accurate assessment of talar translation is vital for surgical planning and outcomes in TAR.
Purpose of the Study:
- To introduce and validate a novel ratio-based method, TCM-Ratio (TCM-R), for measuring coronal talar translation.
- To assess the accuracy and reliability of TCM-R across different talar sizes using noncalibrated radiographs.
- To explore correlations between TCM-R and other factors in patients undergoing TAR.
Main Methods:
- A prospective cohort of 58 patients undergoing TAR was analyzed from a single-institution registry.
- Talar center of migration (TCM) and TCM-Ratio (TCM-R) were measured by four independent raters on preoperative weight-bearing radiographs.
- Inter-rater reliability was assessed using intraclass correlation coefficients (ICCs), and agreement between TCM-R and TCM was evaluated using Pearson correlations.
Main Results:
- Excellent inter-rater agreement was observed for both TCM (ICC = 0.914) and TCM-R (ICC = 0.944).
- TCM-R demonstrated a strong positive correlation with TCM (R = 0.95, P < .001).
- The mean absolute TCM-R value was 13.89% ± 11.29%, indicating its applicability across a range of talar translations.
Conclusions:
- TCM-R is a reliable and accurate method for measuring coronal talar translation, suitable for noncalibrated radiographs.
- This novel ratio-based approach effectively accounts for variations in talar size, overcoming limitations of traditional methods.
- TCM-R shows high correlation with TCM, offering a potentially more versatile tool for assessing deformity in ankle arthritis and guiding TAR procedures.
