By appliance a array of testing procedures, knee proprioception has afresh been arise to be compromised afterwards antecedent cruciate bond (ACL) injury, apparently due to disruption of mechanoreceptors aural the bond (2,3,16,17,20,22). Because somatosensory advice from the lower limb contributes to postural ascendancy (15), letters of decreased knee proprioception accept prompted advisers to additionally abstraction the furnishings of ACL abrasion on measures of continuing antithesis (9,19,21,24,26). These studies accept about circuitous force platforms that accommodate a agency of artful the area of the arena acknowledgment armament from the foot, termed the centermost of burden (27). As a result, a array of measures of force belvedere centermost of burden abstracts accept been acclimated to advance that postural ascendancy is compromised in capacity with ACL amiss knees (21,24) and in capacity afterwards ACL about-face (26).
Given the arise deficits in proprioception and postural control, improvements in these aspects of neuromuscular achievement accept been frequently proposed as the basal mechanisms for the abeyant allowances of knee brace and sleeve use (1,4,5,16,18,20,23,25). Although compressive sleeves accept been arise to advance knee proprioception (16,20) and single-limb continuing antithesis (19) in capacity accepting undergone ACL reconstruction, investigations of the furnishings of braces on these measures are bound (3). A 1995 assay of animating practices adapted that 55% of physicians assigned braces to all of their ACL about-face patients, and 67% of physicians assigned braces to at atomic three abode of these patients (7). Given the aerial costs and boundless use of braces afterwards surgery, as able-bodied as the clearly adapted designs of adamant braces and compressive sleeves, investigations of the abeyant neuromuscular furnishings of these specific accessories are necessary.
Furthermore, although braces and sleeves may enhance proprioception aback activated in nonweight-bearing positions characterized by almost bound somatosensory input, the admeasurement to which this blazon of advance carries over to anatomic activities has been questioned (3–5,12). The charge for added circuitous and functionally accordant tests of these aspects of neuromuscular performance, which absorb activities arise to be ambiguous for individuals accepting undergone ACL reconstruction, has additionally been accent (4,5). Although tests of continuing antithesis may partially accomplish this goal, tasks that added claiming the assorted systems circuitous in postural control, and bigger actor activities encountered during athletics, would accommodate added advice apropos the abeyant allowances of bracing.
For example, tasks that claiming the ascendancy of continuing balance, by eliminating vision, or by altering abutment surfaces and attitude positions, accept been arise to accommodate anticipated changes in achievement and accept been adapted as methods of evaluating the somatosensory addition to postural ascendancy (10,11,14). Additionally, a assay such as the single-limb advanced hop, which involves acclimation on one limb afterwards landing from a astute hop, incorporates functionally accordant challenges. Although this is a accepted and internationally accepted anatomic assay chip into the appraisal of patients afterwards ACL about-face (13), we are blind of any investigations that accept anon quantified the acclimation basal of this task.
The purpose of the present study, therefore, was to appraise the furnishings an ACL brace has on measures of knee proprioception and postural ascendancy adjourned appliance testing situations that circuitous differing acoustic inputs and that challenged postural ascendancy to capricious degrees.
Thirty capacity (Table 1) accepting undergone unilateral arthroscopically assisted ACL about-face (semitendinosus/gracilis quadruple fiber with basal fixation on the tibia and endoon fixation on the femur) at atomic 6 months afore testing were adjourned on one break of about 90-min duration. All capacity had been brash by their surgeons to resume antecedent concrete activities. No accountable arise a history of aloft back, hip, or abate pathology/injury or a history of neurologic ache that adeptness affect proprioception or antithesis testing. Ethics approval was acquired by the University’s Analysis Lath for Health Sciences Analysis Involving Animal Subjects, and all capacity provided accounting a accord afore testing.
Subjects completed tests of knee proprioception, followed by a alternation of single-limb continuing antithesis tests, with and afterwards cutting their brace on the afflicted limb. All braces were custom-built ACL anatomic knee braces. Twenty-five capacity (83%) acclimated a DonJoy Defiance (dj Orthopedics, Vista, CA), admitting the actual bristles capacity acclimated either a Generation II (Generation II Orthotics, Richmond, BC, Canada), Lenox Hill Custom 2 (Seattle Orthopedic Group, Poulsbo, WA), or Omni Avant Garde (Omni Bodyworks, Vista, CA) ACL brace. Capacity wore their gym shorts and shoes for all tests, and the adjustment of brace or no-brace altitude was about allocated.
The adeptness to carbon ambition knee collective angles was adjourned in a nonweight-bearing position with a computerized dynamometer (Kin Com 500–H, Chattecx, TN), appliance a agreement that has been advanced declared in detail (4,5). The dynamometer sampled knee angular position at a bulk of 100 Hz, while authoritative the angular acceleration (5°·s−1) and the bulk of force (between 1 and 5 N) adapted for alive knee addendum movements. While blindfolded and built-in on the dynamometer, capacity actively continued the knee to one of bristles about allocated ambition angles amid 30 and 60° of knee flexion, advancement this bend for a aeon of 3 s. They afresh alternate the knee to the alpha position and, afterwards a 5-s rest, attempted to carbon the advanced accomplished ambition angle, endlessly aback it was perceived that the bend had been replicated. Angular position was continuously recorded by the dynamometer throughout anniversary trial, acceptance the aberration amid ambition and reproduced angles to be afflicted afterwards to the assay session. No acknowledgment apropos achievement was provided.
The ascendancy of single-limb continuing antithesis was adjourned appliance the centermost of burden arresting from force belvedere abstracts (AMTI archetypal OR6–5, Watertown, MA). The force belvedere was 46 × 51 cm in admeasurement and was army alike with the lab floor. During anniversary assay trial, Biomechanics Data-Acquisition and Assay Software (AMTI adaptation 3.1) was acclimated to access 10 s of force belvedere achievement at a sampling bulk of 60 Hz.
During both the brace and no-brace conditions, capacity completed three afterwards single-limb continuing antithesis trials, beneath four adapted testing situations: 1) continuing on the close and abiding belvedere with eyes open, 2) continuing on a 40- × 40-cm mat of 7-cm-thick medium-density polyfoam placed over the belvedere with eyes open, 3) continuing on the abiding belvedere with eyes closed, and 4) continuing on the abiding belvedere afterwards landing from a astute single-limb advanced hop with eyes accessible (described below). Blow periods of 30 to 60 s were provided amid trials, and at atomic 1 min of blow was provided amid anniversary assay situation.
During the continuing tests, capacity stood on their afflicted limb with their attitude bottom centered on the force belvedere and with their knee in slight flexion. Capacity were instructed to lift the artless limb and authority it in about 90° of knee flexion. Once this position had been accomplished and capacity declared that they were ready, abstracts accumulating was accomplished with a computer keystroke. During the trials completed with their eyes open, capacity looked beeline advanced at a cantankerous apparent at about eye akin on a atramentous lath 5 m away. For the trials completed with their eyes closed, capacity looked at the aforementioned cantankerous afore durably closing their eyes (11).
For the single-limb advanced hop tests, astute performances were adjourned on the lab floor, afresh those distances were afresh assimilate the force platform. A taped starting band was aboriginal placed in the mediolateral administration forth the lab’s floor, and the capacity placed the toes of their afflicted limb on the best afterwards aspect of this line. They afresh hopped advanced on that limb, forth addition taped band placed in the anteroposterior direction, landing on the aforementioned limb. Capacity were instructed to hop as far advanced as possible, while ensuring that they maintained single-limb antithesis for 10 s aloft landing. Their accoutrements were chargeless to advance drive for the hop and to acquiesce abetment in balancing. If antithesis was not maintained (i.e., if the capacity could not advance single-limb attitude for the abounding 10 s or if they adapted a step), the ambit was not recorded and the balloon was repeated. Aback capacity had auspiciously completed the task, the position of the best afterwards aspect of their bottom was briefly apparent on the floor, and the ambit to the alpha band was abstinent appliance a accepted metric band measure. Afterwards three to bristles convenance hops of progressively greater distances, three astute performances were recorded and their beggarly ambit calculated. This ambit was afresh acclimated to mark addition alpha band from the centermost of the force platform, and capacity afresh three added hops assimilate the platform, while their centermost of burden abstracts were recorded for the 10 s of single-limb acclimation afterwards landing. Centermost of burden abstracts accumulating commenced aback a beginning vertical arena acknowledgment force of 22 N was detected. The 51-cm breadth of the platform, accompanying with antecedent assurance of astute bent distances, accustomed for abounding allowance to acreage in about the boilerplate of the platform. All capacity auspiciously completed three astute hops while landing absolutely assimilate the platform. A 1-min blow aeon was provided amid hops, and capacity were not a of their hop ambit performances.
Subjects were a that the purpose of anniversary of the antithesis tests was to appraise how still they could bend during the assorted testing situations. They were asked to apply on continuing as still as accessible for the 10 s and to actual their position as bound as accessible if a agitation occurred (11). For anniversary of the tests, if the accountable was clumsy to advance single-limb attitude for the abounding continuance of the trial, the bootless balloon was acclaimed and the alone balloon was alone and afresh repeated.
For the proprioception test, the archetype admeasurement acclimated was an absurdity annual afflicted as the boilerplate complete aberration (AAD) amid the ambition and reproduced angles, averaged over the bristles adapted ambition bend archetype attempts. The brace and no-brace altitude were afresh compared appliance a one-way afresh measures assay of about-face (ANOVA) test.
For the antithesis tests, the anteroposterior and mediolateral locations of the centermost of burden were acquired from the force and moment profiles abstinent by the force belvedere and were acclimated to annual the absolute breadth of the aisle of the centermost of burden throughout the assay trial. The accepted deviations of the centermost of burden arresting were additionally afflicted in the mediolateral and anteroposterior directions.
In befitting with contempo investigations of continuing antithesis in capacity with ACL abrasion (21,24,26), the primary aftereffect admeasurement acclimated during the antithesis appraisal was the breadth of the aisle of the centermost of pressure, averaged over the three trials. Brace and no-brace altitude were compared during the adapted assay situations appliance a two-way ANOVA assay with afresh measures on both factors (two brace altitude by four assay situations). Afterwards a cogent capital aftereffect or interaction, a Tukey column hoc assay was performed. To added appraise directional changes in the movement of the centermost of pressure, accessory analyses included repeating the aloft ANOVA appliance the accepted deviations in the mediolateral and anteroposterior admonition as aftereffect measures. Because 5 of the 30 capacity acclimated a adapted brace than the majority of subjects, all analyses were additionally afresh with these bristles capacity excluded. All statistical analyses were performed appliance Statistica (StatSoft Inc., absolution 5.1, Tulsa, OK). The 0.05 akin was acclimated to denote statistical acceptation throughout testing.
Means and accepted aberration absurdity confined for AAD array empiric during the proprioception assay are illustrated in Figure 1. Results of the ANOVA arise a cogent capital aftereffect for the brace action (F (1,29) = 6.46, P = 0.02), with absurdity array empiric with the brace actuality decidedly lower than afterwards the brace (Fig. 1).
Means and accepted aberration absurdity confined for the breadth of the aisle of the centermost of burden empiric during anniversary of the four acclimation tests are illustrated in Figure 2. Results of the ANOVA arise a cogent capital aftereffect for the assay bearings (F (3,87)= 98.3, P < 0.001), with aisle lengths empiric during anniversary of the tests actuality decidedly adapted from one addition (P < 0.05) (Fig. 2). There was no cogent capital aftereffect for the brace action (F (1,29)=1.55, P = 0.22). There was, however, a cogent assay bearings by brace action alternation (F (3,87)=3.59, P = 0.02), suggesting that the aftereffect of the brace depended on which antithesis assay was used. Column hoc tests adumbrated that the brace decidedly bargain the breadth of the aisle of the centermost of burden aback activated while continuing on the abiding belvedere with eyes accessible (P = 0.02). No added brace against no-brace performances empiric during the added arduous antithesis tests (characterized by added centermost of burden aisle lengths) were decidedly different.
Results were agnate aback the aloft assay was afresh appliance the mediolateral and anteroposterior accepted deviations of the centermost of burden (Table 2), with the barring that a cogent alternation amid the assay bearings and brace action was alone empiric aback the accepted aberration in the anteroposterior administration was analyzed (P = 0.01). Similarly, alone the accepted aberration in the anteroposterior direction, empiric while continuing on the abiding belvedere with eyes open, was decidedly afflicted by the brace (P = 0.04). Results from anniversary of the ANOVA tests acclimated to appraise centermost of burden variables are abbreviated in Table 3. Results were not essentially different, and statistical acceptation was unchanged, aback analyses were afresh with the advanced declared bristles capacity excluded.
The ascertainment of bigger knee proprioception afterwards the appliance of a brace is constant with antecedent studies evaluating the furnishings of braces and sleeves in capacity with ACL abrasion (3,16,20). However, although statistically significant, the consequence of this advance was absolutely baby (Fig. 1). The beggarly abridgement in errors array amid ambition and reproduced angles was alone 0.64° (95% aplomb breach = 0.13–1.15°). The analytic accent of such baby improvements, empiric beneath controlled and bogus testing situations, is arguable (3–5,12) and requires added research.
It has advanced been adapted (4,5) that improvements in these tests of knee proprioception may announce that braces and sleeves accommodate added somatosensory cues that either directly, or reflexively bent proprioceptive pathways (8,17). Given the important role for proprioceptive advice from the lower limb in accidental to postural ascendancy (15), it is believable that added proprioceptive cues provided by a brace or sleeve may additionally accord to the ascendancy of single-limb continuing balance. Kuster et al. (19) arise that cutting a sleeve decidedly bigger the ascendancy of single-limb continuing antithesis in capacity accepting undergone ACL reconstruction, approved by a cogent abridgement in the breadth of the aisle of the centermost of pressure, with the aberration of the centermost of burden in the anteroposterior administration actuality decidedly afflicted (variation was quantified as the basis beggarly aboveboard and was bargain about 20%). The assignment acclimated in that abstraction circuitous advancement antithesis afterwards dispatch off a 10-cm acclivity assimilate a abiding force belvedere with eyes open. We accept that this assignment was best agnate to the present study’s acclimation assignment performed on the abiding belvedere with eyes open. Indeed, in the present study, cutting the brace additionally decidedly bargain the breadth of the aisle of the centermost of burden (Fig. 2), and the anteroposterior aberration of the centermost of burden (variation was quantified as the accepted aberration and was bargain 13%) during the agnate testing bearings (Table 2).
The ascertainment that the brace afflicted postural ascendancy in the anteroposterior administration is constant with letters suggesting that the knee plays an important role in the ascendancy of single-limb continuing antithesis (19). This ascertainment is additionally constant with letters that individuals with ACL abrasion authenticate broken achievement in tests which accent the knee joint’s sagittal alike adherence (9) and added corroborates the advancement that single-limb continuing antithesis is an adapted assay for these individuals (19,24,26).
Although the brace bigger achievement during the best basal assay of single-limb continuing antithesis (characterized by abate centermost of burden aisle lengths), these improvements did not arise to backpack over to the added arduous acclimation tasks. Specifically, admitting celebratory the accepted accelerating access in centermost of burden variables as the adversity of the tasks increased, the brace appeared to accept little all-embracing aftereffect on performance, decidedly during the added difficult assay situations (Fig. 2 and Table 2). As centermost of burden variables represent the axial afraid system’s motor acknowledgment in authoritative antithesis (27), a accelerating access in these variables indicates that capacity were experiencing ample motor action during these added difficult acclimation tasks. Because proprioception involves the affiliation of a array of sources including joint, bark and, best importantly, beef receptors (8), it is accessible that added acoustic motor action accomplished during these added arduous tasks minimized any annual from the brace. Although the brace may accept provided knee proprioceptive cues, its addition may accept been accessory compared with the somatosensory advice already available.
In a accompanying matter, the better access in the breadth of the aisle of the centermost of burden was empiric during the assignment completed with eyes closed, demonstrating the important role of eyes for postural ascendancy (Fig. 2). It has advanced been arise that continuing antithesis tests performed on a abiding apparent with eyes accessible finer acclaimed capacity with ACL amiss knees from advantageous subjects, admitting tests performed with the eyes bankrupt did not (21). The present award that the brace bigger the ascendancy of continuing antithesis during the assay performed on the abiding apparent with eyes open, but not with eyes closed, may be accompanying to that antecedent ascertainment (21). Both allegation are constant with the advancement that aback the antithesis ascendancy arrangement is challenged, the constant apparent access in acoustic motor action may abate any attenuate changes in knee proprioception that abrasion or animating may provide.
Further column hoc analyses were performed to appraise the accord amid the knee proprioception, continuing balance, and advanced hop measures. Pearson artefact moment alternation coefficients adumbrated that knee collective position faculty was ailing accompanying to the ascendancy of continuing antithesis (r = 0.003–0.19, P > 0.32), suggesting that these tasks absorb appreciably adapted physiological processes. These allegation are additionally constant with the altercation that baby changes in knee proprioception can action in the absence of alterations in the ascendancy of continuing balance. Also, apropos the anatomic appliance of the present tests, performances during continuing antithesis tests which apparently claiming the somatosensory addition to postural ascendancy (i.e., those completed on cream or with eyes closed) were decidedly accompanying to single-limb advanced hop distances (r = −0.41, P < 0.05), admitting achievement during the proprioception assay was not (r = 0.14, P > 0.50).
Regardless of the abeyant basal mechanisms, because best able-bodied activities absorb alike added arduous situations than those in the present study, the present allegation catechism the analytic accent of the empiric improvements. In this regard, while advancement antithesis afterwards the astute advanced hop, lengths of the paths of the centermost of burden were actual agnate during the brace (89.6 ± 14.1 cm) and no-brace (87.7 ± 16.1) altitude (Fig. 2). Due to this statistically nonsignificant difference, a column hoc ability adding was performed. Appliance the empiric accepted aberration of the aberration amid the two conditions, and a alternate alpha amount of 0.05, 30 capacity provided 80% ability to ascertain a change of 6.6 cm, or a aberration of alone 6%(6). As able-bodied as not affecting the acclimation basal of the advanced hop test, the hop distances were not decidedly adapted for the brace (108.2 ± 27.8 cm) and no-brace (108.2 ± 28.4 cm) conditions. This award is additionally constant with beforehand letters (9).
Although the present allegation are constant with contempo suggestions (3–5,12) that attenuate changes in knee proprioception may accept little anatomic backpack over to weight-bearing activities, it is believable that added proprioceptive advice from a brace or sleeve could aftereffect in adapted limb accession accomplished in mid air and conceivably affect landing characteristics. Although the analytic acceptation of such allegation is anon unclear, it has been arise that the appliance of a compressive sleeve may adapt arena acknowledgment armament aback landing (19). Because added abeyant furnishings of braces cannot be disqualified out, added controlled investigations of the abiding analytic furnishings of brace and sleeve use, including differences in these devices, are necessary.
Application of a custom-built ACL anatomic knee brace resulted in statistically cogent improvements in knee proprioception and in the ascendancy of single-limb continuing balance, aback adjourned appliance controlled class situations characterized by almost bound somatosensory input. However, the consequence of these improvements were absolutely baby and did not backpack over to the added difficult and functionally accordant acclimation tasks. These allegation are constant with contempo letters that catechism the analytic annual of attenuate changes in called aspects of neuromuscular achievement attributable to bracing. Added analysis evaluating the abiding furnishings of brace and sleeve use is necessary.
This analysis was accurate in allotment through awards provided by the Medical Analysis Council and Physiotherapy Foundation of Canada to Trevor B. Birmingham.
Address for correspondence: Trevor B. Birmingham, School of Concrete Therapy, Faculty of Health Sciences, The University of Western Ontario, London, Ontario, Canada N6G 1H1; E-mail: [email protected]
STANDING BALANCE,; KINESTHESIA,; JOINT POSITION SENSE,; ANTERIOR CRUCIATE LIGAMENT,; ORTHOSIS
Medicine & Science in Sports & Exercise33(8):1253-1258, August 2001.
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