Fig. 4

Results of correlation analysis. FH, fibular head height; K–L grading, Kellgren and Lawrence grading; JLCA, joint line convergence angle; MPTA, medial proximal tibial angle; HKAA, hip–knee–ankle angle. A The higher the K–L grade, the smaller the FH; B FH is negatively correlated with JLCA; C FH is positively correlated with MPTA; D FH is negatively correlated with HKAA. All P < 0.001