Finite element analysis comparison between superior clavicle locking plate with and without screw holes above fracture zone in midshaft clavicular fracture

Table 2 Comparison of the peak stress values and the normalized von Mises stress pattern between the SHFZ and No-SHFZ plates in three different loading conditions

Reference point^a	Peak von Mises stress value (MPa)
	Cantilever bending load		Axial compression load		Axial torsion load
	SHFZ plate	No-SHFZ plate	SHFZ plate	No-SHFZ plate	SHFZ plate	No-SHFZ plate
M1	100.48	116.63	6.60	7.40	17.13	17.54
M2	88.18	84.84	12.35	11.54	37.39	39.44
M3	628.77	647.21 ^Max	123.89	128.61	74.52	79.47
FZ-M	1257.10 ^Max	561.30	186.42 ^Max	97.30	103.42	59.07
FZ-L	1131.80	514.42	178.72	93.19	111.86 ^Max	59.09
L1	428.44	461.05	124.78	131.63 ^Max	79.19	82.41 ^Max
L2	81.74	54.76	20.47	21.03	33.23	33.09
L3	55.34	54.76	5.21	5.75	16.20	16.86
Average peak stress^b
Medial clavicle (M1–3)	358.48	282.89	47.61	49.18	43.01	45.48
FZ (FZ-M, FZ-L)	1194.45	537.86	182.57	95.25	107.64	59.08
Lateral clavicle (L1–3)	188.51	190.19	50.15	52.80	42.87	44.12

^aReference point: the point of each screw hole (SH) position in the SHFZ plate, or the same position in the No-SHFZ plate, from medial end to lateral end
M1, M2, and M3: the 1st, 2nd, and 3rd medial SH positions of the medial clavicle fragment
FZ-M and FZ-L: the medial and lateral SH positions, or the same ones in the No-SHFZ plate, above the fracture zone
L1, L2, and L3: the 1st, 2nd, and 3rd medial SH positions on the lateral clavicle fragment
^bAverage peak stress: the mean of peak stress value in each zone (medial clavicles include M1, M2, and M3; SHFZ includes FZ-M and FZ-L; and lateral clavicle include L1, L2, and L3)
^Max: the presented reference point has the highest peak von Mises stress value in that loading condition

ISSN: 1471-2474