Postural responses to lateral perturbation in healthy subjects and ankle sprain patients

Brunt, Denis; Andersen, J. C.; Huntsman, Bowen; Reinhert, L. B.; Thorell, A. C.; Sterling, James C.

doi:10.1249/00005768-199202000-00003

Cited by 71 publications

(60 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…(0) Much less strong than the other ankle (1) Slightly less strong than the other ankle (2) Equal in strength to the other ankle (3) Slightly stronger than the other ankle (4) Much stronger than the other ankle 6. How would you describe your ankle's ability when you descend stairs?…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Balance Training for Persons With Functionally Unstable Ankles

Rozzi¹,

Lephart²,

Sterner³

et al. 1999

J Orthop Sports Phys Ther

312

248

View full text Add to dashboard Cite

Objectives: To determine the effects of a 4-week balance training program during stance on a single leg. Background: Individuals who have experienced multiple episodes of inversion ankle sprains often participate in balance training programs. Balance training is performed to treat existing proprioceptive deficits and to restore ankle joint stability, presumably by retraining altered afferent neuromuscular pathways. The effectiveness of such programs on individuals with functionally unstable ankles has yet to be established.Methods and Measures: Prior to and following training, subjects with self-reported functionally unstable ankles (5 women and 8 men, mean age = 21.9 t 3.1 years) and nonimpaired subjects (6 women and 7 men, mean age = 212 t 2.5 years) completed a static balance assessment for both limbs as well as the ankle joint functional assessment tool questionnaire (AJFAT). The subjects from both groups participated in a unilateral, multilevel, static and dynamic balance training program 3 times a week for 4 weeks. Subjects from the experimental group trained only the involved limb, and the nonimpaired group trained a randomly selected limb. A stability index (SI) was calculated during the balance assessment to indicate the amount of platform motion. Compared to low stability indices, high stability indices indicate greater platform motion during stance and therefore l ess stability. Results: Following training, subjects from both groups demonstrated significant improvements in balance ability. When balance was assessed at a low resistance to platform tilt (stability level 21, the posttraining scores of both the subjects with unstable ankles (mean SI = 2.63 t 1.92) and the nonimpaired subjects (mean SI = 2.69 2 2.32) were significantly better than their pretraining scores (mean Sl s = 5.93 2 3.65 and 4.67 2 3.43, respectively). Assessed at a high resistance to platform tilt (stability level 6), the posttraining scores of both subjects with unstable ankles (mean SI = 1.27 t 0.66) and the nonimpaired subjects (mean SI = 1.37 + 0.66) were significantly better than their pretraining scores (mean Sl s = 2.30 + 1.88 and 2.04 + 1.43, respectively). Additionally, the posttraining AJFAT scores of subjects with unstable ankles (25.78 + 3.80) Functional instability of the ankle joint has been defined by Freeman7 as "a tendency for the foot to give way after an ankle sprain." Three factors thought to cause functional instability of the ankle joint are anatomic or mechanical instability, muscle weakness, and deficits in joint proprio~eption.'~ At this time, there are no objective data that conclusively show that muscle weakness is a viable explanation for functional ankle instability. However, the combination of mechanical instability and decreased neuromuscular control resulting from deficits in joint propriocep tion may result in functional instability of the ankle j~i n t .~J " J~J~ Deficits in ankle joint proprie ception with diminished neuromuscular control have been documented following ankle joint ligamentous ...

show abstract

Section: Resultsmentioning

confidence: 99%

“…How would you describe your ankle's ability when you descend stairs? (0) Much less than the other ankle (1) Slightly less than the other ankle (2) Equal in amount to the other ankle (3) Slightly more than the other ankle (4) Much more than the other ankle 7. How would you describe your ankle's ability when you jog?…”

Section: Resultsmentioning

confidence: 99%

Balance Training for Persons With Functionally Unstable Ankles

Rozzi¹,

Lephart²,

Sterner³

et al. 1999

J Orthop Sports Phys Ther

312

248

View full text Add to dashboard Cite

show abstract

“…Researchers 12,13,[28][29][30]42 have extensively studied the protective mechanism of the peroneus longus regarding its ability to respond to inversion perturbations. Strong emphasis has been placed on the peroneus longus for its reflexive ability due to the reflex contraction initiated by intrafusal muscle fibers against inversion moments.…”

Section: Discussionmentioning

confidence: 99%

Lower Extremity Muscle Activation in Patients With or Without Chronic Ankle Instability During Walking

Feger

Donovan

Hart

et al. 2015

Journal of Athletic Training

View full text Add to dashboard Cite

Context: Ankle sprains are among the most common musculoskeletal injuries, and many individuals with ankle sprains develop chronic ankle instability (CAI). Individuals with CAI exhibit proprioceptive and postural-control deficits, as well as altered osteokinematics, during gait. Neuromuscular activity is theorized to play a pivotal role in CAI, but deficits during walking are unclear.Objective: To compare motor-recruitment patterns as demonstrated by surface electromyography amplitudes between participants with CAI and healthy control participants during walking.Design: Descriptive laboratory study. Setting: Laboratory.Patients or Other Participants: Fifteen adults with CAI (5 men, 10 women; age ¼ 23 6 4.2 years, height ¼ 173 6 10.8 cm, mass ¼ 72.4 6 14 kg) and 15 matched healthy control adults (5 men, 10 women; age ¼ 22.9 6 3.4 years, height ¼ 173 6 9.4 cm, mass ¼ 70.8 6 18 kg).Intervention(s): Participants walked shod on a treadmill while surface electromyography signals were recorded from the anterior tibialis, peroneus longus, lateral gastrocnemius, rectus femoris, biceps femoris, and gluteus medius muscles.Main Outcome Measure(s): Preinitial contact amplitude, postinitial contact amplitude, time of activation relative to initial contact, and percentage of activation time across the stride cycle were calculated for each muscle.Results: Time of activation for all muscles tested occurred earlier in the CAI group than in the control group. The peroneus longus was activated for a longer duration across the entire stride cycle in the CAI group (36.0% 6 10.3%) than the control group (23.3% 6 22.2%; P ¼ .05). No differences were noted between groups for measures of electromyographic amplitude at either preinitial or postinitial contact (P . .05).Conclusions: We identified differences between the CAI and control groups in the timing of muscle activation relative to heel strike in multiple lower extremity muscles and in the percentage of activation time across the entire stride cycle in the peroneus longus muscle. Individuals with CAI demonstrated neuromuscular-activation strategies throughout the lower extremity that were different from those of healthy control participants. Targeted therapeutic interventions for CAI may need to be focused on restoring normal neuromuscular function during gait.

show abstract

“…[6][7][8][9][10][11] Like most measures of proprioception, joint reposition sense has typically been tested by production of both the target and reproduction angle with the ipsilateral ankle. [12][13][14] Our laboratory 15 and others, 16 have deviated from this model by using a contralateral reproduction model.…”

Section: Introductionmentioning

confidence: 99%

Contralateral force sense deficits are related to the presence of functional ankle instability

2006

View full text Add to dashboard Cite

Residual symptoms that often follow lateral ankle sprains can lead to functional ankle instability. Proprioceptive deficits have been identified as one factor that may contribute to the presence of functional ankle instability. Sixty participants were recruited to participate in the study. Seven questions were used to determine the presence of functional ankle instability in each participant. A point was added for each ''yes'' response to produce an index that represents an interval data scale of functional ankle instability. Contralateral force sense and active joint reposition sense were measured in all participants. Pearson product moment correlations were calculated to determine the relationship between functional ankle instability and force sense and active joint reposition sense. We found a significant relationship with force sense and functional ankle instability. Specifically, force sense variable error at both test forces (10 and 30% of maximal voluntary isometric contraction) were positively correlated to the presence of functional ankle instability, r ¼ 0.26; p 0.05 and r ¼ 0.25; p 0.05, respectively. All other force sense correlations were not statistically significant. No significant correlations were identified between active joint reposition sense and functional ankle instability. This study indicates that participants with functional ankle instability have deficits in low load force sense, but not active joint reposition sense. ß

show abstract

Postural responses to lateral perturbation in healthy subjects and ankle sprain patients

Cited by 71 publications

References 0 publications

Balance Training for Persons With Functionally Unstable Ankles

Balance Training for Persons With Functionally Unstable Ankles

Lower Extremity Muscle Activation in Patients With or Without Chronic Ankle Instability During Walking

Contralateral force sense deficits are related to the presence of functional ankle instability

Contact Info

Product

Resources

About