Defining a Relationship between the Tibial Plateau and Posterior Femoral Condyles

Area of Science:

• Orthopedic research
• Anatomic morphology
• Biomechanical engineering

Background:

• Previous studies focused on femoral morphology, neglecting the relationship between posterior femoral condyles and the tibial plateau.
• Understanding knee joint morphology differences across genders and ethnicities is crucial for personalized medicine and implant design.

Purpose of the Study:

• To investigate the relationship between posterior femoral condylar width and tibial plateau width.
• To analyze how this relationship varies when stratified by gender and race.

Main Methods:

• Utilized CT scans from an international database of 373 non-arthritic knees.
• Measured medial-lateral width of posterior femoral condyles and tibial plateau width using computer software.
• Performed statistical analysis on the entire cohort and stratified by gender and ethnicity.

Main Results:

• A strong positive correlation (R²=0.83) was found between posterior femoral condylar width and tibial plateau width.
• Gender stratification weakened the correlation (R²=0.64 for females, R²=0.60 for males).
• Ethnic stratification showed varied impacts: strengthening in Japanese (R²=0.87), North American (R²=0.89), and South Korean (R²=0.88) groups, while weakening in Indian (R²=0.72) and Chinese (R²=0.82) groups.

Conclusions:

• This is the first study to demonstrate the strength of tibiofemoral relationships across demographic groups using CT.
• Findings highlight significant morphological differences that can inform knee implant design, selection, and stocking.
• Data may aid in preoperatively identifying patients needing specific component sizes.