Ankle dorsiflexion among healthy men with different qualities of lower extremity movement.

Context: Lower extremity movement patterns have been implicated as a risk factor for various knee disorders. Ankle-dorsiflexion (DF) range of motion (ROM) has previously been associated with a faulty movement pattern among healthy female participants. Objective: To determine the association between ankle DF ROM and the quality of lower extremity movement during the lateral step-down test among healthy male participants. Design: Cross-sectional study. Setting: Training facility of the Israel Defense Forces. Patients or Other Participants: Fifty-five healthy male Israeli military recruits (age = 19.7 +/- 1.1 years, height = 175.4 +/- 6.4 cm, mass = 72.0 +/- 7.6 kg). Intervention(s): Dorsiflexion ROM was measured in weight-bearing and non-weight-bearing conditions using a fluid-filled inclinometer and a universal goniometer, respectively. Lower extremity movement pattern was assessed visually using the lateral step-down test and classified categorically as good or moderate. All measurements were performed bilaterally. Main Outcome Measure(s): Weight-bearing and non-weight-bearing DF ROM were more limited among participants with moderate quality of movement than in those with good quality of movement on the dominant side (P = .01 and P = .02 for weight-bearing and non-weight-bearing DF, respectively). Non-weight-bearing DF demonstrated a trend toward a decreased range among participants with moderate compared with participants with good quality of movement on the non-dominant side (P = .03 [adjusted P = .025]). Weight-bearing DF was not different between participants with good and moderate movement patterns on the nondominant side (P = .10). Weightbearing and non-weight-bearing ankle DF ROM correlated significantly with the quality of movement on both sides (P<.01 and P<.05 on the dominant and nondominant side, respectively). Conclusions: Ankle DF ROM was associated with quality of movement among healthy male participants. The association seemed weaker in males than in females.