Spatial frequency analysis detects altered tissue organization following hamstring strain injury at time of injury but not return to sport

Table 2 Time of injury within-image spatial frequency analysis parameter measures of injured and contralateral limbs

SFA parameter	Imaged limb	Within-image region	Parameter value^†	P-value^‡ [95% Confidence Interval]
PSFR (mm⁻¹)	Involved	Injury site	0.77 (0.24)	p = 0.06 [− 0.01, 0.25]
	Involved	Adjacent	0.89 (0.25)	p = 0.06 [− 0.01, 0.25]
	Contralateral	Mirrored injury site	0.83 (0.18)	p = 0.16 [− 0.04, 0.22]
	Contralateral	Adjacent	0.92 (0.26)	p = 0.16 [− 0.04, 0.22]
Mmax% (%)	Involved	Injury site	1.41 (0.43)	p < 0.01 [0.51, 1.21]
	Involved	Adjacent	2.28 (0.50)	p < 0.01 [0.51, 1.21]
	Contralateral	Mirrored injury site	2.49 (0.58)	p = 0.30 [− 0.49, 0.17]
	Contralateral	Adjacent	2.33 (0.67)	p = 0.30 [− 0.49, 0.17]

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