Postoperative excessive external femoral rotation in revision total hip arthroplasty is associated with muscle weakness in iliopsoas and gluteus medius and risk for hip dislocation

Table 2 Factors correlated with femoral rotation

Person’s correlation	r	P value
Age (years)	− 0.01	0.93
Body mass index (kg/m²)	0.10	0.740
Preoperative femoral rotation	0.11	0.44
Leg length extension	− 0.26	0.06
Change of femoral offset	− 0.14	0.29
Postoperative anatomical stem anteversion	− 0.54	0.001*
Size of psoas muscle	− 0.09	0.53
Size of iliac muscle	− 0.17	0.22
Size of gluteus maximus	− 0.05	0.71
Size of gluteus medius	− 0.09	0.49
CT density of psoas muscle	− 0.29	0.03*
CT density of iliac muscle	− 0.31	0.03*
CT density of gluteus maximus	− 0.17	0.22
CT density of gluteus medius	− 0.39	0.004*

ISSN: 1749-799X