Open-access Influência da inclinação lateral associado ou não ao calço na escoliose idiopática

fm Fisioterapia em Movimento Fisioter. mov. 0103-5150 1980-5918 Pontifícia Universidade Católica do Paraná Resumo Introdução: Os benefícios dos exercícios de inclinação lateral associado ao calço na escoliose pode atuar reorganizando as assimetrias encontradas nestes indivíduos. O objetivo do estudo foi analisar a influência do movimento de inclinação lateral associado ou não ao calço em indivíduos com escoliose idiopática. Materiais e Métodos: Foram selecionados 10 indivíduos de ambos os gêneros na faixa etária de 13 a 24 anos com escoliose em "S", torácica direita e lombar esquerda maiores que 10º. Inicialmente a ordem da tarefa foi estática e posteriormente dinâmica, após isso houve o sorteio das condições com o calço. Os valores dos ângulos posturais durante os cinco movimentos de inclinação lateral foram obtidos, assim como os valores mínimos e máximos para cada angulo. O valor médio dos ângulos posturais na posição estática, sem calço, foi usado como referência. Resultados: o movimento associado ao calço obteve resultados menos significativos em comparação com o efeito do calço na posição estática e nos movimentos de inclinação lateral realizados isoladamente, não houve resultados significativos em nenhum ângulo. Discussão: o movimento, tanto para o lado da convexidade como para o lado oposto, parece influenciar de maneira a diminuir o efeito do calço isoladamente. O movimento de inclinação lateral realizados isoladamente não conseguiram influenciar nos ângulos posturais de maneira geral, demonstrando que uma intervenção aguda apenas talvez não seja eficiente. Conclusão: A influência do movimento de inclinação lateral associado ao calço alto e baixo em ambos os lados se mostrou eficaz, contudo só o calço na posição estática produziu mudanças mais significativas e, portanto, sendo considerado uma melhor intervenção no sentido de evitar a progressão de curvas duplas em indivíduos com escoliose idiopática. Introduction Scoliosis is an abnormal spatial arrangement of individual body segments which the Central Nervous System (CNS) interprets as a defect and thus automatically launches compensatory mechanisms 1. The most common type of scoliosis is defined as idiopathic that has unknown pathogenesis, in other words, any disease, injury or mutation that entails a set of disabilities or deterioration of any component might result in the development of this kind of scoliosis. The likelihood of progression is higher in girls and in children with a large curvature and remaining growth 6. To avoid the curvature progression of the scoliosis there are many conservative treatments, among which electrical stimulation, physical exercises, manipulation, insoles and braces can be mentioned 7. The main goals that the patients hope to achieve with these treatments are: stop the curvature progression at puberty, prevent the treatment of a respiratory dysfunction or a back pain syndrome and improve aesthetics through postural correction. The deformity determines the treatment of the idiopathic scoliosis 8. Side-shift exercises are used as a conservative treatment for scoliosis, consisting of an auto correction of the spine curve through a lateral shift of the trunk to the concavity of the curve 7. Stehbens and Cooper 9 studied the effects of the side-shift exercise to the side of the scoliotic curve convexity in sitting, standing and supine positions to reduce the primary curve. The proposed exercise program restored the vertebrae and intervertebral discs to a more appropriate position with regression of the scoliotic curve. In addition, the early stages of functional scoliosis, associated with lower limb length discrepancy, can be corrected with the use of shoe lifts to reduce these postural asymmetry generators 3,10. Thus, the primary goal of the shoe lift is to decrease the compensations that occur in idiopathic scoliosis due to information reorganization, to maintain the postural stability compensation brings, thereby aligning the feet, knees, pelvis, scapula and shoulders 11,12,13,14. Therefore, due to the scarcity of research related to the effectiveness of conservative treatment in idiopathic scoliosis 15 the main goal of the present study was to assess the influence of the side-shift movement, associated or not with the use of high or low shoe lifts, in subjects with idiopathic scoliosis. Materials and methods Ten subjects of both genders, aged from 13 to 24 years, were selected. with "S" scoliosis and right thoracic and left lumbar greater than 10º, confirmed by Cobb angle measurements in a radiological examination, characterizing structural curves 16,17. The subjects, their parents or a legal representative signed an Informed Consent approved by the local Research Ethics Committee as an extension of the Project previously approved with the same methodology (CEP 124/2009). The exclusion criteria were: use of prosthesis and/or orthesis, surgery performed on the spine, pregnancy and scoliosis of non-idiopathic etiology 4. Initially, personal information and anthropometric measurements, such as weight, height, BMI (Body Mass Index) and lower limb length were assessed. Next, the subjects attended the Laboratory of Physiotherapy Applied to Human Movement (Laboratório de Fisioterapia Aplicada ao Movimento Humano) of the Faculty of Science and Technology/UNESP - Presidente Prudente Campus for realization of the experimental procedures. The subjects wore bathing suits for the placement of markers at specific anatomic points. These points were defined based on previous studies 18,19,20, with 10 reflective markers, 13mm in diameter, being placed on the spine of each subject at the following anatomic points: spinous process of the seventh cervical vertebra (C7); spinous process of the second (T2), fourth (T4), sixth (T6), eighth (T8), tenth (T10) and twelfth (T12) thoracic vertebrae; spinous process of the second (L2) and fourth (L4) lumbar vertebrae and at the medial sacral crest. The subjects were filmed with three cameras (Panasonic, models PVGS180 and PVGS320), placed on wall brackets, arranged within the collection area and oriented following the calibration system of volume coordinates (x, y and z axis) to perform the calibration. The calibration was composed of a tridimensional reference system with 12 points of control and a volume of 1,07 x 1,66 x 1,23 m (length, height and depth, respectively). Initially the task order was static, followed by dynamic (right side-shift movement or left side-shift movement); after which there was a draw to define the condition (low or high shoe lift, right or left foot), the order was recorded and the collection followed this order. In table 1 the order is merely explanatory: in the first trial the condition was without a shoe lift and a static filming of the subject in a "nominal position" was performed, with the marker already placed, for about 15 seconds. Table 1 Collection steps divided into trials, conditions and tasks performed by the control and experimental groups The trial was filmed and then recorded on MiniDV video tapes. Posteriorly, the images were captured using the CapDV mode in the software Ariel Performance Analysis System (APAS version 1.4), after which the images were treated using Trimer, Digitize, Transform Filter and Display. Figure 1 features the convention used to calculate the angles based on the studies by Engsberg et al. 18 and Feipel et al. 19, adapted to measure postural angles in this study. Four spine postural angles were obtained in the frontal plane: two in the thoracic region; the first angle was in the high thoracic, denominated angle α1, formed by T2T4 -T4T6 markers and angle α2 in the middle thoracic, formed by T6T8b - T8T10 markers; one in the thoracolumbar region, denominated α3 and formed by T10T12 - T12L2 markers; and one in the lumbar region denominated α4 formed by L2L4 - L4S1 markers. Figure 1 Representation of the spine postural angles in the frontal plane, with the a1 angle in the thoracic region, a2 angle in the middle thoracic region, a3 angle in the thoracolumbar region and a4 angle in the lumbar region The data obtained in the condition, maintenance of static posture without shoe lift, were used to identify the postural angle configuration in the orthostatic position and their absolute values were determined. The intermediary five seconds of the 15 seconds of footage collected were digitalized using APAS and the standard deviation and mean of these angles were also calculated. An average value of postural angles lower than 180º represented a curvature to the left and an average value of postural angles greater than 180º represented a curvature to the right. Conditions with side-shift movement to the left or right were used to identify the behavior of the same angles in dynamic situations. Thus, five side-shift movements to the right and five side-shifts to the left were digitalized and analyzed. Postural angle values and minimum and maximum values while executing the five side-shift movements were obtained for each movement. The average value of postural angles in the static position, without a shoe lift, was used as a reference to perform another subtraction related to the average value of the previously calculated maximum and minimum postural angles. From these data, the influence that the side-shift movement with or without a shoe lift (high or low) would produce as an immediate effect on the curves of the subject with idiopathic scoliosis, represented by the postural angles, was analyzed. Minimum and maximum values were obtained from each angle and subtracted from the average value of the respective angle in the static position. Next, the average of these subtractions was calculated, for both values, for each angle of each situation, involving all subjects. From these data, how much each maximum and minimum average value influenced the postural angles, regarding the static position, was analyzed, in order to rectify them (angles near 180º). Negative average values were analyzed as if they were positive. For example, in the case of a subject executing a task determined by the draw and having a minimum α2 angle of 183º, while in the static position the α2 angle was 185º, the subtraction between the condition and the static position would be -2º. Assuming this value repeats for all the subjects for the same condition the average value would be negative, however, even with negative values, a statistically significant difference was observed in order to rectify the curvature, approaching 180º. Therefore, there is no interference in the signal of the average values, but whether the difference was, or not, in order to rectify the spine curvature through the task the subject was asked to perform. Data were analyzed using the statistical software SAS and the significance level was set at 0.05. For the side-shift comparison, the Sign test was used; a non-parametric procedure for hypothesis testing using small samples, when there is no requirement for data normality and unknown population distribution. Results The 10 subjects (age = 20.0 ± 2.87 years; weight = 55.65 ± 9.48 kg; height = 1.67 ± 0.09 m; BMI = 18.92 ± Kg/m2) with "S" scoliosis, with right thoracic curve (17° ± 8.8°) and left lumbar curve (15º ± 7.9º), were analyzed during side-shift movements in isolation or associated with high or low shoe lifts and also in the static position with high or low shoe lifts. Table 2 features the difference between means (maximum and minimum) of α1, α2, α3 and α4 in side-shift movements to the right with shoe lifts of 1cm and 3cm in relation to the static position and p value. Table 2 Difference between means (maximum and minimum) of α1, α2, α3 and α4 in side-shift movements to the right with shoe lifts of 1 cm and 3 cm in relation to the static position and p value Note: *p < 0.05 ** marginal difference Table 3 features the difference between postural angle means in situations that involved side-shift movements to the left with shoe lifts on both sides. Table 3 Difference between means (maximum and minimum) of α1, α2, α3 and α4 in side-shift movements to the left with shoe lifts of 1 cm and 3 cm in relation to the static position and p value Besides the dynamic situation, allied to the shoe lift, only the influence of high or low shoe lifts in the static position were analyzed, in relation to the minimum and maximum angles of each intervention (Table 4). The difference between means (maximum and minimum) of α1, α2, α3 and α4 of side-shift movements for both sides in isolation were also analyzed in relation to the static position. However, there was no significant difference in any analyzed data (p > 0.3). Table 4 Difference between means (maximum and minimum) of a1, α2, α3 and α4 in the static position with shoe lifts of 1 cm and 3 cm in relation to the static position without shoe lift and p value A Note: *p < 0.05 ** marginal difference Discussion The main goal of this study was to assess the influence of the side-shift movement associated or not with the use of a high or low shoe lift in subjects with idiopathic scoliosis. Some studies 4 have shown that the side-shift movement to the side of the highest curve convexity (thoracic) and the shoe lift on the same side as the lumbar curve convexity 11,12,21 has the effect of improving alignment in the scoliosis. Besides the type of intervention, the best results for conservative treatment are obtained when they comprise an angulation deformity between 10º to 25º of the Cobb angle measurements 22. It can be observed that the only angles that followed this tendency were those that resulted from side-shift movements to both sides, allied with left shoe lift (except in the situation with right side-shift movement with right shoe lift in the minimum α2), in which the sacral and thoracolumbar angles (α4 and α3 respectively) were those that responded most to the intervention. As there were no studies in this area, until this moment, it can be observed that the movement allied with the use of a shoe lift obtained less significant results when compared to the effect of shoe lift use in the static position. Thus the movement, both to the convexity and to the opposite side, seems to diminish the shoe lift effect, both in the higher (α1 and α2) and lower (α3 and α4) postural angles. In the present study, the side-shift movement to both sides in isolation, in comparison to the static position, did not present a significant difference or influence the postural angles in any way, showing that an acute intervention alone is not effective, although an intervention with a greater number of stimulations could present a different result 23. As shown in the study by Maruyama et al. 24, using side-shift exercises to the side of the scoliotic curve as a treatment proved to be a useful option for scoliosis after skeletal maturity. Stehbens and Cooper 9 also obtained the same satisfactory results with this kind of treatment. Still related to the side-shift movement, as there was no control group for comparison it was not possible to find results related to the influence of the movement on the curve flexibility. The study of Ferreira and Barela 4 conducted with a control group and subjects with double curved scoliosis found no significant differences for alpha angles in either group, although the measurements of alpha posture angles, when not equal, were very close to those of the control group. Therefore, the mentioned study showed that when a subject with scoliosis executes a side-shift movement, the outcome is deformity correction. This also happened in the study of Ferreira et al. 25 that assessed the influence of side-shift movements. This being said, as the present study did not perform the same comparison, this corrective effect could not be observed; nevertheless, further studies are needed to verify the influence of the side-shift movement as an intervention for subjects with idiopathic scoliosis, taking into account the comparison with a control group. Besides the dynamic situations, the use of the high and low shoe lifts in the static position were analyzed It was observed that all maximum angles, when using the left shoe lift, presented a significant difference, noting that the highest means of changes in relation to the static position occurred in the maximum angles of α2, α3, and α4, however there was a significant difference in all postural angles. Beyond this, it was also observed that in all situations with the left shoe lift the differences were more significant than with the right shoe lift. These findings are consistent with other studies 12,21 that claim the occurrence of higher angles in the thoracolumbar region, a transition region and far from the apical vertebrae (more rigid), indicating greater flexibility in this region and larger shoe lift effects were expected in the lower curves 13 in the alpha angles 3 and 4. According to Hawes and O'Brien 3 the secondary or compensatory curves are more flexible and could present more alterations when subjected to shoe lift or movement interventions. However, Zabjek et al. 14 indicate that the use of insoles, regardless of the curve type and amplitude, significantly decrease the Cobb angle. On the other hand, when the shoe lift was used on the right side, the greatest changes were obtained in the minimum angles α2 and α3 for both heights of shoe lift. Consequently, it can be stated that the shoe lift, besides influencing sacral and thoracolumbar angles, also influences high thoracic angles (α2) both minimum, with right shoe lift, and maximum, left shoe lift. However, the greatest alterations were in the lower postural angles as in the previously mentioned studies 4,21. High and low shoe lifts produced different effects in static and dynamic situations. In the side-shift movements to both sides, allied to the use of the high shoe lift, greater effects were observed when compared to the use of the low shoe lift, wherein, except in the side-shift movement to the left using a left shoe lift, the postural angles were close in order to rectify the spine curvature when greater stimulation (high shoe lift) was chosen for the subjects in this intervention. In the static position, with a high or low shoe lift, the same results were not observed, especially regarding the thoracolumbar and lumbar postural angles that showed that the lower shoe lifts produced a greater effect when compared to the higher shoe lifts. This demonstrates that a static intervention with a shoe lift does not have a linear relationship with its height, as found by Zabjek et al. 14. However, in a dynamic situation the shoe lift height should be taken into account, as shown in these study results, since the side-shift movement, as stated above, acts by inhibiting the shoe lift effect, whereby greater stimulation needs to be given in order to achieve the effectiveness of a static intervention. According to Bricot 26, scoliosis develops itself as a tonic postural system disease and not as a fatality, acting in it as a simple line of conduct, not knowing the postural system, can result in a disappointing effect. Postural control is extremely important in the ability to maintain balance in an upright position relying on the sensory system and musculoskeletal biomechanics 27. Thus, a precise assessment of the static position must be performed with minimum influence from postural balance and a good correlation with radiographic methods 28, aiming to help the therapist in the best choice for patient intervention. Besides the shoe lift, proprioceptive insoles present some benefits such as deformity accommodation, giving support and stability through pressure relief at certain points of high compression. According to Mantovani et al. 29, insoles promote adequate postural realignment making the assessment of feet dysfunctions necessary to understand the postural influences. In this context, for individuals with idiopathic scoliosis, an efficient feet sensor assessment can help the therapist choose the most efficient intervention by using insoles or shoe lifts. On the other hand, the asymmetrical functioning of the masticatory muscles can also present a compensatory role in postural balance 30,31, in addition to clinical conditions such as temporomandibular dysfunctions which can result in jaw limitations, pain and functional incapability 32. A study by D'Avila et al. 33 reported that a unilateral posterior crossbite produces occipital axis deviation thus resulting in a unilateral pelvic anteriorization, pelvic inclination and a hint of gibbosity. Therefore, more studies are needed on the sensors, aiming to verify which factors can generate these compensations, which result in the pathology in question, in other words, scoliosis. This study had two limitations that could have produce better and more consistent results: sample size and lack of control group. In this study, ten subjects with only one specific type of scoliosis were analyzed; however, due to this specificity it was difficult to find a larger number of subjects with this kind of curvature. Moreover, the lack of a control group limited the conclusive data, since there was no normality pattern with which to compare the results; it has been shown in the literature that in some situations, interventions closer to normality could be considered as effective ways to treat idiopathic scoliosis 25. Thus, in future studies in this field, the sample size and presence of a control group or comparisons with other types of intervention should be noted. Conclusion The influence of the side-shift movement allied to high or low shoe lifts on both sides was proven to be effective, although the shoe lift alone in the static position produced more significant changes and, thus, is considered a better type of intervention to avoid progression of double curve in subjects with idiopathic scoliosis. The immediate effect of this intervention (shoe lift allied to the side-shift movement) only in subjects with idiopathic scoliosis occurred in both high thoracic and lumbar region postural angles, producing greater changes in lower postural angles. Therefore, the influence of the shoe lift in isolation or allied to the side-shift movement to both sides showed an immediate effect in order to rectify the spine of subjects with idiopathic scoliosis, with a more significant difference when using the shoe lift alone. Nevertheless, more studies are needed to verify whether this immediate effect remains in long-term interventions. References 1 1 Nowotny, J; Nowotny-Czupryna, O; Czupryna, K. Various attitudes to the use of corrective exercises in conservative treatment of scoliosis {abstract}. Ortop Traumatol Rehabil. 2010;12:1-11. Nowotny J Nowotny-Czupryna O Czupryna K. 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