Fig. 4From: Association between changes in hip-knee-ankle angle and hindfoot alignment after total knee arthroplasty for varus knee osteoarthritisAge affected the association between the change in HKA (CHKA) and change in HFA (CHFA). The smooth curves indicated a correlation between the CHKA and CHFA in the group under 65 years. However, no correlation was detected in the group older than 65 years. Abbreviations: CHKA, change in Hip-Knee-Ankle angle; CHFA, change in hindfoot alignment.Back to article page