Changes in femoral rollback and rotation with increasing coupling in knee arthroplasty—a biomechanical in-vitro study

Table 1 Femoral rollback and femoral external rotation of the different implant types from 20° of flexion to 85° of flexion

	Femoral rollback		Femoral external rotation mean (SD) [°]
	Lateral condyle mean (SD) [mm]	Medial condyle mean (SD) [mm]	Femoral external rotation mean (SD) [°]
native	8.7 (7.0)	2.1(3.2)	8.1 (6.9)
GCR	2.8 (7.3)	-0.1 (4.4)	3.4 (7.8)
GPS	3.2 (5.1)	1.0 (4.5)	2.5 (5.3)
RSL	0.1 (3.0)	-1.0 (3.6)	1.3 (4.2)
SSL	-0.6 (2.7)	-1.4 (5.0)	0.8 (3.8)

Abbreviations: SD standard deviation; native—native knee, GCR Gemini cruciate retaining, GPS Gemini posterior stabilized, RSL rotational hinge model, SSL total hinge model

ISSN: 1471-2474