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Balance problems after unilateral lateral ankle sprains.

INTRODUCTION

Lateral ankle sprains are the most common acute pathology seen in athletic activities [1]. Up to one-sixth of all time lost from sports is because of this type of injury [2]. Sixteen percent of all sports injuries are ankle ligament sprains [3]. The cost for treatment and rehabilitation of these injuries is $2 billion a year [4]. Reducing the incidence of ankle ligament injuries depends on identifying the conditions under which such injuries occur (e.g., extrinsic EVIDENCE, EXTRINSIC. External evidence, or that which is not contained in the body of an agreement, contract, and the like.
     2. It is a general rule that extrinsic evidence cannot be admitted to contradict, explain, vary or change the terms of a contract or of a
 variables, such as height and ankle-specific measures, that might predispose pre·dis·pose
v.
To make susceptible, as to a disease.
 athletes to such injuries) [4].

Many researchers have reported that individuals with a history of ankle sprains are more susceptible to subsequent ankle sprains or chronic ankle instability [5-7]. Otter found that 73 percent of ankle sprains occur in ankles that had previously been sprained [8]. Therefore, previously sprained ankles must have some risk factors that cause them to be recurrently sprained [5]. Numerous factors and mechanisms are thought to contribute to this increased ankle sprain ankle sprain Orthopedics A stretching of the ankle ligaments and/or muscles with swelling  occurrence [9]. Some of these factors are instability, muscle weakness, limited mobility of the ankle joint ankle joint
n.
A hinge joint formed by the articulating of the tibia and the fibula with the talus below. Also called mortise joint, talocrural joint.
, problems related to footwear, and damage to the proprioceptors in the ligaments of the ankle [6,9]. According to Michelson and Hutchins, two levels of proprioception proprioception

Perception of stimuli relating to position, posture, equilibrium, or internal condition. Receptors (nerve endings) in skeletal muscles and on tendons provide constant information on limb position and muscle action for coordination of limb movements.
 exist: conscious (voluntary) and unconscious (reflexive). While the conscious aspect is involved in overall control during sports and activities of daily living, the unconscious aspect is involved in joint stabilization during unexpected perturbations [10]. Nashner showed that one of the main factors in reducing body sway in a standing position is proprioception [11].

Body sway will increase if proprioception is deficient because of ligamentous injury [12]. In other words Adv. 1. in other words - otherwise stated; "in other words, we are broke"
put differently
, balance will be disturbed in such cases. Balance problems can be measured by two different procedures: (1) clinical tests and (2) laboratory tests with new equipment [13]. Two examples of clinical procedures are the Functional Reach Test (FRT FRT Freight
FRT Fort
FRT Federal Realty Investment Trust
FRT Fire Retardant Treated (wood construction)
FRT Fast Repetitive Tick (biology)
FRT Fonds de la Recherche Technologique
) and the Star-Excursion Balance Test (SEBT SEBT Star Excursion Balance Test (injury risk predictor) ) [14-15]. One new piece of laboratory equipment for evaluating balance is the Biodex Balance System (Biodex Medical Systems; Shirley, New York Shirley is a hamlet (and census-designated place) in Suffolk County, New York, United States. As of the 2000 census, Shirley population was 25,395.

Shirley is a community in the Town of Brookhaven, on the South Shore of Long Island.
), which can be used for measuring body sway (balance index) and determining limits of stability (LOS) [16-17]. Body sway and LOS can be measured in either bi- or unilateral standing positions. Because the ankle joint has an essential role in balance control, the location of the center of pressure depends on the ankle joint position and leg muscle (plantar flexor flexor /flex·or/ (flek´ser)
1. causing flexion.

2. a muscle that flexes a joint.


flexor retina´culum  see entries under retinaculum.
 and dorsiflexor) activity. Balance control in unilateral standing will be disturbed in patients with functional ankle instability [16].

This study examined balance problems in athletes with Rouzier Grade I and II unilateral lateral ankle sprains. We were interested in the following questions: (1) Do any balance problems exist after traumatic ankle ligament sprain? (2) Which aspect of balance ability suffers most? (3) What are the effects of vision (open or closed eyes) on balance ability in patients with ankle sprain?

METHODS

Subjects

This study was a clinical trial that was conducted in physical therapy clinics of the Sports Medicine Federation of Iran between April 2003 and March 2004. The ethics committee of the Iran University of Medical Sciences Iran University of Medical Sciences (IUMS) is a large medical school in Iran.

Located in Tehran, it was founded in 1974, is state operated, and currently trains 7000 students in the medical field.
 approved the study. All subjects were informed about the procedures and signed a consent form prior to participation. The subjects were 30 male athletes involved in multidirectional sports (football, volleyball, and martial arts). These athletes with right-side dominance and Grade I and II traumatic ankle sprain (according to Rouzier grading) were aged 22.8 [+ or -] 4.8 years [18]. All data are presented as mean [+ or -] standard deviation unless otherwise noted. Subjects were excluded for orthopedic and/or neurological conditions, uncorrected problems with vision, chronicity and recurrence of the sprain, and left-side dominance.

Data Collection

Data collection included subject interviews, appropriate musculoskeletal musculoskeletal /mus·cu·lo·skel·e·tal/ (-skel´e-t'l) pertaining to or comprising the skeleton and muscles.

mus·cu·lo·skel·e·tal
adj.
Relating to or involving the muscles and the skeleton.
 evaluations, and performance on different balance tests. Individual characteristics (age, weight, and height), job, grade of sprain, number of involved ligaments, involved side, kind of sport, date of injury, and grade of pain were recorded with a questionnaire. Ankle range of motion (ROM) was measured by goniometer goniometer /go·ni·om·e·ter/ (go?ne-om´e-ter)
1. an instrument for measuring angles.

2. a plank that can be tilted at one end to any height, used in testing for labyrinthine disease.
. Before being tested, subjects with severe pain or joint swelling were treated to a level at which they could bear full weight, their ankle muscle strength was at least 4 according to the manual muscle test [19], and their ankle ROM was 80 percent of the normal range. Each subject participated in a training session before testing that included an explanation of the procedure and performance of different parts of the main tests. Sway index was measured with the Biodex Balance System 945-302 (Biodex Medical Systems; Shirley, New York) for bi- and unilateral standing on the involved and sound limb with eyes in the open and closed positions. LOS were measured with this system for bi- and unilateral standing on the involved and sound limb. In addition, static balance was evaluated with the FRT; a mean of three repetitions was considered. Dynamic balance was evaluated with the SEBT; a mean of five repetitions was considered.

Statistical Package for the Social Sciences (statistics, tool) Statistical Package for the Social Sciences - (SPSS) The flagship program of SPSS, Inc., written in the late 1960s.

["SPSS X User's Guide", SPSS, Inc. 1986].
, Version 10 (SPSS A statistical package from SPSS, Inc., Chicago (www.spss.com) that runs on PCs, most mainframes and minis and is used extensively in marketing research. It provides over 50 statistical processes, including regression analysis, correlation and analysis of variance. , Inc; Chicago, Illinois), was used for statistical analysis. We used paired t-tests for comparing data related to balance ability of involved and sound limbs and chi-square analyses for comparing sensitivity of the different balance tests to balance problems. An [alpha] level of 0.05 was set for the analyses.

RESULTS

Subjects were 22.8 [+ or -] 4.8 years old, 74.14 [+ or -] 8.26 kg in mass, and 179.96 [+ or -] 7.05 cm tall. Of the 30 subjects, 17 had a right-side sprain and 13 had a left-side sprain; 14 subjects had a Grade I and 16 had a Grade II sprain. One ligament was injured in 17 subjects, two ligaments were injured in 5 subjects, and three ligaments were injured in 8 subjects. The anterior talofibular ligament The anterior talofibular ligament passes from the anterior margin of the fibular malleolus, forward and medially, to the talus, in front of its lateral articular facet.

It is the most commonly sprained ligament, as part of the lateral ligament of the ankle.
 was sprained in 26 subjects, the calcaneofibular ligament in 12 subjects, and the posterior talofibular ligament The posterior talofibular ligament, runs almost horizontally from the depression at the medial and back part of the fibular malleolus to a prominent tubercle on the posterior surface of the talus immediately lateral to the groove for the tendon of the flexor hallucis longus.  in 10 subjects.

On the FRT, mean distance displaced in bilateral standing was significantly lower than unilateral standing on involved and sound limbs (p < 0.001) (Table 1). On the SEBT, mean distance displaced in unilateral standing on involved and sound limbs was significantly different (Table 1). Balance index was significantly lower for bilateral standing with eyes open compared with eyes closed (p < 0.001). With eyes open, balance ability for unilateral standing on involved limb was significantly lower compared with sound limb (p < 0.001). Balance ability for unilateral standing on sound limb was 24 percent better than on involved limb. Values for LOS for unilateral standing on involved and sound limbs were not significantly different (Table 1).

Chi-square tests showed a strong relationship between the scores of all balance tests in the study for detecting balance problems after traumatic ankle ligament sprain (p > 0.90) (Table 2).

DISCUSSION

In this study, the anterior talofibular ligament was sprained in 26 subjects, the calcaneofibular ligament in 12 subjects, and the posterior talofibular ligament in 10 subjects. This result agrees with Otter's results [8]. He reported that the anterior talofibular ligament is the most commonly injured, followed by the calcaneofibular ligament. The posterior talofibular ligament is injured only in severe sprains. This pattern of ligament sprain could be attributed to such factors as ankle joint structure, mechanism of injury (inversion), and strength of ankle ligaments. The anterior talofibular ligament is the weakest of the lateral ankle ligaments, and it acts against inversion forces.

The results of the balance tests in this study indicate that after traumatic lateral ankle sprains, balance problems occur because of proprioceptive Proprioceptive
Pertaining to proprioception, or the awareness of posture, movement, and changes in equilibrium and the knowledge of position, weight, and resistance of objects as they relate to the body.
 deficiency. The FRT was used for evaluating static balance. This test is a valid and reliable clinical tool for evaluation of balance. FRT in the present study for bilateral standing was 29.20 [+ or -] 5.96 cm for 20- to 35-year-old males. Duncan et al. reported the normal value of that test to be 41.74 [+ or -] 4.75 cm for 20- to 40-year-old persons [20]. A significant difference was noted between the results of this study for individuals with lateral ankle sprain and subjects with no ankle injuries. Our results show that functional test values were greater while subjects were standing on one limb compared with bilateral standing. This may be due to the fact that subjects use their free limb as a balancing lever during unilateral standing. However, the results indicate that static balance of athletes with ligament sprain becomes abnormal because of proprioceptive deficiency.

In comparing the results of the FRT for unilateral standing on the sound or involved limb, we noted a significant difference. The static balance on the involved limb was 12.7 percent lower than on the sound limb. The SEBT was used for dynamic balance evaluation. Mean values for the sound and involved limbs were significantly different [14].

The balance index was significantly lower for bilateral standing with eyes open compared with eyes closed. The sensorimotor sensorimotor /sen·so·ri·mo·tor/ (sen?sor-e-mo´ter) both sensory and motor.

sen·so·ri·mo·tor
adj.
Of, relating to, or combining the functions of the sensory and motor activities.
 system normally uses inputs from three afferent afferent /af·fer·ent/ (af´er-ent)
1. conveying toward a center.

2. something that so conducts, such as a fiber or nerve.


af·fer·ent
adj.
 systems: vestibular, somatosensory somatosensory /so·ma·to·sen·sory/ (so?mah-to-sen´so-re) pertaining to sensations received in the skin and deep tissues.

so·mat·o·sen·so·ry
adj.
, and visual. When one of those systems (somatosensory) is impaired, the two intact systems compensate for the impaired one to some extent. But when the subject closes his or her eyes, only one intact afferent system remains for balance control. Therefore, balance index in the eyes-closed situation becomes higher compared with eyes open [13-14,21].

With eyes open, unilateral standing balance on the involved limb was significantly lower compared with the sound limb. Balance control while subjects were standing on the sound limb was 24 percent better than on the involved limb. This result agrees with Freeman et al. [6], Nashner [11], Garn and Newton [12], Tropp and Odenrick [16], Bullock-Saxton et al. [22], Lentell et al. [9], and Leanderson et al. [23], who all reported that impairment of proprioception has a major effect on balance after lateral ankle sprains.

LOS in unilateral standing on the involved and sound limbs were not significantly different, but test duration on the sound limb was shorter than on the involved limb, which means that motor control of the involved limb was disturbed.

The results reveal that after Grade I and II lateral ankle sprains, balance problems occur and are a result of proprioceptive deficits, especially the unconscious (reflexive) part of proprioception as opposed to the conscious (voluntary) part [10]. This factor probably plays an important role in recurrence of ankle sprain. Therefore, an effective rehabilitation program for managing proprioceptive deficits should be followed.

CONCLUSIONS

From these results, we can conclude that after acute ankle sprains, the unconscious (reflexive) part of proprioception is more severely affected than the conscious (voluntary) part. In other words, improvement of the conscious part of proprioception can occur during the first month of treatment, but for improvement of the unconscious part, we have to wait about 3 to 6 months, depending on the degree of injury.

Abbreviations: FRT = Functional Reach Test, LOS = limits of stability, ROM = range of motion, SEBT = Star-Excursion Balance Test.

ACKNOWLEDGMENTS

This material was based on work supported by the Tarbiat Modares University Colleges
Tarbiat Modares University (TMU) is a fully Accredited Graduate University and a prestigious center for higher education in Iran. TMU has 7 colleges: Arts, Engineering, Agriculture, Basic Sciences, Humanities, Natural Resources, Marine Sciences and Medical Sciences.
, Tehran, Iran. We would also like to thank the Department of Physical Therapy of the Sports Medicine Federation of Iran, Tehran, Iran, for use of their equipment and facilities.

The authors have declared that no competing interests exist.

Submitted for publication January 2, 2006. Accepted in revised form April 4, 2006.

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1. slackness or looseness; a lack of tautness, firmness, or rigidity.

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[Greek k
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Mohammad Akbari, PhD; (1) * Hossein Karimi, PhD; (1) Hossein Farahini, PhD; (2) Soghrat Faghihzadeh, PhD (3)

Departments of (1) Physical Therapy and (2) Orthopedic Surgery, Iran University of Medical Sciences, Tehran, Iran; (3) Department of Biostatistics, Tarbiat Modares University, Tehran, Iran

* Address all correspondence to Dr. Mohammad Akbari, Department of Physical Therapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, PO Box 15875-4391, Tehran, Iran; +9821-22227124; fax: +982122220946. Email: akbarimo43@yahoo.com DOI (Digital Object Identifier) A method of applying a persistent name to documents, publications and other resources on the Internet rather than using a URL, which can change over time. : 10.1682/JRRD.2006.01.0001
Table 1.
Comparison of mean values for sound and involved limb on different
balance tests.

                      Sound Limb               Involved Limb
Balance Test      (Mean [+ or -] SD)        (Mean [+ or -] SD)

FRT (cm)          34.79 [+ or -] 7.22       30.39 [+ or -] 3.93
SEBT (cm)         86.80 [+ or -] 9.34       84.97 [+ or -] 10.26
DBO                1.84 [+ or -] 0.46        2.42 [+ or -] 0.93
DBC                6.63 [+ or -] 2.38        6.58 [+ or -] 2.29
LOS (%)            17.6 [+ or -] 7.6         16.4 [+ or -] 7.7
LOST (s)         111.03 [+ or -] 35.22     122.60 [+ or -] 41.95
WBC (kg)          53.93 [+ or -] 21.16      46.03 [+ or -] 21.16
WBO (kg)          45.73 [+ or -] 29.82      55.27 [+ or -] 29.82

Balance Test         95% CI          t-Test     p-Value

FRT (cm)         -3.44 to -5.36       -9.38      0.001
SEBT (cm)        -0.25 to -3.42       -2.36      0.025
DBO               0.89 to 0.26         3.68      0.001
DBC               0.69 to -0.80       -1.46      0.885
LOS (%)           0.61 to -2.95       -1.34      0.192
LOST (s)         20.87 to 2.27         2.54      0.017
WBC (kg)          7.87 to -23.73      -1.03      0.313
WBO (kg)         12.80 to -31.74      -0.87      0.392

CI = confidence interval, DBC = dynamic balance bilateral standing
eyes closed, DBO = dynamic balance bilateral standing eyes open,
FRT = Functional Reach Test, LOS = limits of stability, LOST = limits
of stability time, SD = standard deviation, SEBT = Star-Excursion
Balance Test, WBC = weight-bearing eyes closed, WBO = weight-bearing
eyes open.

Table 2.
Distribution of scores on balance tests for involved limb (N = 30).
Scores on all balance tests were divided into four groups to create
classes. Number of individuals in each class was determined, and
chi-square test indicated a strong relationship (p > 0.90).

          Star-Excursion       Functional          Dynamic
           Balance Test        Reach Test         Balance *

Group      Class      n       Class       n      Class      n

1          61-71      7       18-23       7     4.7-5.6     8
2          72-82      8       24-29      10     3.6-4.6     8
3          83-93      8       30-35       5     2.5-3.5     7
4          94-104     7       36-40       8     1.4-2.4     7

            Limits of          Limits of
            Stability        Stability Time

Group      Class      n       Class       n

1           4-12      7      193-234      7
2          13-21      8      150-192      8
3          22-30      8      107-149      8
4           4-12      7       64-106      7

* Test performed while subjects' eyes were open.
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Author:Akbari, Mohammad; Karimi, Hossein; Farahini, Hossein; Faghihzadeh, Soghrat
Publication:Journal of Rehabilitation Research & Development
Article Type:Report
Date:Nov 1, 2006
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