Article

OBJECTIVE: To determine whether sagittal plane talar position differs between
uninjured controls and individuals with chronic ankle instability (CAI) using
lateral ankle radiographs. DESIGN: Single-blind case control. SETTING:
University-based sports medicine research laboratory. PARTICIPANTS: University
students (N=48) volunteered to participate. Twenty-four uninjured controls (12
men, 12 women; mean +/- SD, 21.8+/-2.6y; 170+/-10cm; 73+/-16kg), and 24 adults
with CAI (12 men, 12 women; 21.7+/-2.8y; 175+/-13cm; 71+/-13kg) participated.
INTERVENTION: A single nonweight-bearing lateral radiograph was taken of each
ankle. Subjects were positioned side lying with the hip and knee in a neutral
position in the transverse plane and the ankle joint in a neutral position (90
degrees of dorsiflexion, 0 degrees of inversion/eversion). MAIN OUTCOME MEASURE:
The sagittal plane talar position was calculated as the distance between the most
anterior margin of the inferior tibia and the most anterior margin of the talar
dome in millimeters for each radiograph. RESULTS: Talar position was
significantly more anterior in the involved CAI limb (3.69+/-1.37mm) than the
uninvolved CAI limb (2.98+/-1.61mm; P=.03). Additionally, an anterior talar
position was significantly greater in the involved CAI limb than the matched
control limb (2.65+/-1.24cm; P<.01). No differences were found between the
uninvolved CAI limb and the matched control group limb (P=.57) or between the
limbs of the uninjured control group (P=.75). Intratester reliability was found
to be .90, while intertester reliability was .78. CONCLUSIONS: An anterior talar
positional fault is present in the involved limb of individuals with CAI relative
to their uninvolved limb and compared with the matched limb of a control group.
The talar position measurement technique has excellent intratester and
intertester reliability.

Langue : ANGLAIS