Table 3.

Results of best evidence synthesis of studies for each H:Q ratio.

	Low risk of bias	High risk of bias	Association with injury (↑/=)	Association with injury(Best synthesis result)	Level of evidence
Hamstring injury study
Conventional ratio
60°/s	Dauty et al.3 Dauty et al.,34 Croisier et al.13 Zvjiac et al.42 Shalaj et al.36 Henderson et al.31 Schippers and Leach28 Yeung et al.41	Dauty et al.33 Orchard et al.38 Cameron et al.39 Yamada and Mastumoto43 Bennell et al.37 Lee et al.35	↑ Orchard et al.,38 Cameron et al.,39 Lee et al.35 = Dauty et al. 33 Yamada and Mastumoto,43 Bennell et al.,37 Dauty et al.,3 Dauty et al.,34 Croisier et al.,13 Zvjiac et al.,42 Shalaj et al.,36 Henderson et al.,31 Schippers and Leach,28 Yeung et al.41	No	Strong
120°/s	Dauty et al.3		= Dauty et al.3	No	Moderate
180°/s	Dauty et al.3 Henderson et al.31 Yeung et al.41	Orchard et al.38 Yamada and Mastumoto43 Bennell et al.37	↑ Dauty et al.,3 Yeung et al.41 = Henderson et al.,31 Orchard et al. 8 Yamada and Mastumoto,43 Bennell et al.,37	Unknown	Conflicting
240°/s	Dauty et al.3 Croisier et al.13 Shalaj et al.36 Yeung et al.41	Lee et al.35	↑ Lee et al.35 = Dauty et al.,3 Croisier et al.,13 Shalaj et al.,36 Yeung et al.41	No	Strong
300°/s	Henderson et al.31	Orchard et al.38	= Orchard et al.38 Henderson et al.31	No	Moderate
Functional ratio
60°/s	Dauty et al.3 Yeung et al.41 Sugiura et al.40	Bennell et al.37	↑ Sugiura et al.40 = Dauty et al.,3 Yeung et al.,41 Bennell et al.37	No	Strong
60°/s–300°/s	van Dyk et al.29		= van Dyk et al.29	No	Moderate
120°/s	Dauty et al.3		= Dauty et al.3	No	Moderate
180°/s	Yeung et al.41	Bennell et al.37 Fousekis et al.32	= Bennell et al.37 Fousekis et al.,32 Yeung et al.,41	No	Moderate
240°/s	Yeung et al.41		= Yeung et al.41	No	Moderate
Mixed ratio
	Dauty et al.3 Dauty et al.,34 Croisier et al.13	Dauty et al.33 Lee et al.35	↑ Dauty et al.3 = Dauty et al.,34 Croisier et al.,13 Dauty et al.,33 Lee et al.,35	No	Strong
Other	Sugiura et al.,40 van Dyk et al.30		= Sugiura et al.,40 van Dyk et al.30	No	Strong
ACL injury study
Conventional ratio
60°/s	Shimozaki et al.47 Hietamo et al.,46 Uhorchak et al. 48	Steffen et al.45	= Shimozaki et al.,47 Hietamo et al.,46 Uhorchak et al.,48 Steffen et al.,45	No	Strong
300°/s		Myer et al.44	= Myer et al.44	No	Limited
Functional ratio
60°/s	Uhorchak et al.48		= Uhorchak et al.48	No	Moderate

Notes: ↑ means significant association with future injury; = means no significant association with future injury.

Abbreviations: ACL = anterior cruciate ligament; H:Q = hamstrings-to-quadriceps.