Retrospective cohort study of 308 non-osteoarthritic knees in 160 young patients (mean age 30±7 years) that introduces the functional knee phenotype classification — a composite system combining hip-knee-ankle angle (HKA), femoral mechanical angle (FMA), and tibial mechanical angle (TMA) — and asks how well current TKA alignment strategies match native anatomy.
When planning TKA, resist defaulting to mechanical alignment for every patient — this study shows fewer than 6% of healthy young knees actually have anatomy matching that target.
Use the functional knee phenotype framework (HKA + FMA + TMA together, not separately) to characterize a patient's native coronal anatomy and select an alignment strategy accordingly.
Retrospective cohort study of 308 non-osteoarthritic knees in 160 young patients (mean age 30±7 years) that introduces the functional knee phenotype classification — a composite system combining hip-knee-ankle angle (HKA), femoral mechanical angle (FMA), and tibial mechanical angle (TMA) — and asks how well current TKA alignment strategies match native anatomy.
When planning TKA, resist defaulting to mechanical alignment for every patient — this study shows fewer than 6% of healthy young knees actually have anatomy matching that target.
Use the functional knee phenotype framework (HKA + FMA + TMA together, not separately) to characterize a patient's native coronal anatomy and select an alignment strategy accordingly.