TY - JOUR
T1 - Effect of peripheral afferent alteration of the lateral ankle ligaments on dynamic stability
AU - Myers, Joseph B.
AU - Riemann, Bryan L.
AU - Hwang, Ji Hye
AU - Fu, Freddie H.
AU - Lephart, Scott M.
PY - 2003
Y1 - 2003
N2 - Background: The sensorimotor influence of the lateral ankle ligaments in muscle activation is unclear. Hypothesis: The lateral ankle ligaments have significant sensorimotor influence on muscle activation. Study Design: Controlled laboratory study. Methods: Muscle-firing characteristics in response to a high-speed inversion perturbation and during gait were assessed in 13 normal subjects. Solutions (1.5% lidocaine or a placebo of saline) were injected bilaterally into the anterior talofibular and calcaneofibular ligaments (1.5 ml per ligament) to alter peripheral afferent influence. Subjects were again tested with the same protocol. Results: The protective response of the anterior tibialis and peroneal muscles during inversion perturbation and mean muscle activation amplitude decreased during running after both injections. After injection, no significant differences were seen for muscle reflex latencies, maximum amplitude, time to maximum amplitude during inversion perturbation, or mean amplitude during walking. Conclusion: The lateral ankle ligaments have a sensorimotor influence on muscle activation. Clinical Relevance: Induced edema from the injected solutions may have altered the sensorimotor influence of the lateral ankle ligaments, thereby inhibiting the dynamic ankle stabilizers. This finding suggests that dynamic stability may be compromised because of swelling after joint injury.
AB - Background: The sensorimotor influence of the lateral ankle ligaments in muscle activation is unclear. Hypothesis: The lateral ankle ligaments have significant sensorimotor influence on muscle activation. Study Design: Controlled laboratory study. Methods: Muscle-firing characteristics in response to a high-speed inversion perturbation and during gait were assessed in 13 normal subjects. Solutions (1.5% lidocaine or a placebo of saline) were injected bilaterally into the anterior talofibular and calcaneofibular ligaments (1.5 ml per ligament) to alter peripheral afferent influence. Subjects were again tested with the same protocol. Results: The protective response of the anterior tibialis and peroneal muscles during inversion perturbation and mean muscle activation amplitude decreased during running after both injections. After injection, no significant differences were seen for muscle reflex latencies, maximum amplitude, time to maximum amplitude during inversion perturbation, or mean amplitude during walking. Conclusion: The lateral ankle ligaments have a sensorimotor influence on muscle activation. Clinical Relevance: Induced edema from the injected solutions may have altered the sensorimotor influence of the lateral ankle ligaments, thereby inhibiting the dynamic ankle stabilizers. This finding suggests that dynamic stability may be compromised because of swelling after joint injury.
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U2 - 10.1177/03635465030310040401
DO - 10.1177/03635465030310040401
M3 - Article
C2 - 12860535
AN - SCOPUS:0038457398
SN - 0363-5465
VL - 31
SP - 498
EP - 506
JO - American Journal of Sports Medicine
JF - American Journal of Sports Medicine
IS - 4
ER -