Table 1.

Deflection Angles of Spinal Implants in 3 T and 7 T Fields

Spinal Implant			Averaged Deflection Angle (°)
Material	Length (cm)	Weight (g)	7 T	3 T
Rod
Pure titanium	5	5.5	5.0	2.0
	10	10.8	5.8	1.7
	15	16.2	6.2	1.0
	20	21.6	6.2	1.0
	20,  cross‐linked	66.0	N.A.	N.A.
Titanium alloy	5	5.3	5.7	2.3
	10	10.6	6.5	2.3
	15	15.9	6.8	1.7
	20	21.1	7.7	1.0
	20, cross‐linked	65.0	N.A.	N.A.
Cobalt–chrome	5	9.9	17.8	6.0
	10	19.9	19.2	6.3
	15	29.8	20.3	5.7
	20	39.9	21.0	5.0
	20, cross‐linked	102.6	N.A.	N.A.
Range (median)	5.0–20.0 (12.5)	5.5–102.6 (19.9)	5.0–21.0 (6.65)	1.0–6.3 (2.15)
Screw
Titanium alloy/cobalt–chrome	5.8	12.1	10.0	3.2
Cross‐linking bridge
Titanium alloy	5.2	11.4	6.7	2.2