The purpose of this study is to explore the effects of mobilization of C0-C1 and C7-T1 applied to asymptomatic individuals with reduced upper cervical rotation during the FRT. Design: parallel randomized controlled trial. 48 subjects(38.52 years±15.13) with C1-C2 rotation hypomobility in TFR joined the study and were randomized into three groups(C0, C7, control group). FRT in both directions was measured before and after the intervention. C0 intervention consisted of a dorsal translatoric mobilization of C0-C1 in the cervical neutral position. C7 intervention consisted of a ventral cranial translatoric mobilization of C7- T1 in neutral position and the control group maintained a supine position. C0 group experienced a FRT ROM to the restricted side increase of 17.64。(SD=4.55), that was significantly greater (P<0.001) than 5.95。 (SD=4.81) of the C7 group and 2.45。(SD=5.05) of the control group. The results showed that a dorsal translatoric mobilization of C0-C1 in neutral position restored the physiological FRT mobility in subjects with C1-C2 hypomobility and experienced statistical significant improvement in FRT as compared to a C7-T1 translatoric mobilization and a control group. (Level of evidence: 1b).

INTRODUCTION
 METHODS
  Subjects
  Flexion-Rotation Test
  Interventions
 RESULTS
  FRT to the restricted side
  FRT to the non restricted side
 DISCUSSION
 CONCLUSIONS
 REFERENCES

• César Hidalgo-García(Associate Professor at University of Zaragoza, Zaragoza, Spain) correspondence
• José Miguel Tricás-Moreno(Senior Professor at University of Zaragoza, Zaragoza, Spain)
• Orosia Lucha-López(bSenior Professor at University of Zaragoza, Zaragoza, Spain)
• Elena Estebanezde Miguel(Senior Professor at University of Zaragoza, Zaragoza, Spain)
• Elena Bueno-Gracia(Associate Professor at University of Zaragoza, Zaragoza, Spain)
• Silvia Pérez-Guillén(Associate Professor at University of Zaragoza , Zaragoza, Spain)
• Pablo Fanlo-Mazas(Associate Professor at University of Zaragoza,Zaragoza, Spain)
• Alazne Ruiz-de-Escudero(Associate Professor at University of Zaragoza, Zaragoza, Spain)
• John Krauss(Senior Professor at Oakland University, Rochester, Michigan,USA)