Is scoliosis related to mastication muscle asymmetry and temporomandibular disorders? A cross-sectional study

Clinical significance of concomitant pectus deformity and adolescent idiopathic scoliosis: systematic review with best evidence synthesis

“…With a prevalence of 2%-3% in the general population, almost 10% needs brace treatment and 0.1%-0.3% surgical correction [1] . Multiple physical mechanisms explaining a misbalance in forces have been proposed as the cause of AIS [2] , correlating AIS to adjacent musculoskeletal pathologies; both cranially [3] , caudally [4] and ventrally [5] .…”

Upper Extremity Skeletal Muscle Mass Asymmetry Exacerbated by Shoulder Imbalance in Lenke1A Adolescent Idiopathic Scoliosis

“…These results suggest that in AIS with a constructive thoracic curve, right shoulder up is an independent risk factor for upper extremity skeletal muscle asymmetry. There are many reports focusing on muscle asymmetry in scoliosis involving paravertebral, psoas, and masticatory muscles [ 12 , 13 , 14 ]. However, to our knowledge, this is the first study to show asymmetry in upper extremity muscle mass in patients with AIS.…”

“…Various left-right imbalances, such as shoulder and body balance, have been observed in AIS. Many studies of AIS-related muscle asymmetry involve paravertebral, psoas, and masticatory muscles [ 12 , 13 , 14 , 15 ]. In contrast, asymmetry in limb muscles in patients with AIS remains unclear.…”

Spinal disorders and mastication: The potential relationship between adolescent idiopathic scoliosis and alterations of the chewing patterns

“…The reverse direction of closure is associated with serious alterations of the mandibular kinematic. 25 In fact, RCCs are related to specific features of the chewing pattern, that is narrow kinematic developing near the vertical axis in the frontal plane, with one or more cross over of the opening and closing traces and a severely limited lateral displacement of the mandible that moves mainly along the vertical axis, with a very limited freedom of movement (Figure 2). All the parameters of the RCC are indicative of a lower masticatory efficiency.…”

“…Interestingly, a previous study showed that spinal curvatures affect the anatomical, biomechanical and kinesiological features of the masticatory system, and individuals with AIS may experience more chewing problems than asymptomatic individuals. 25 Based on this result and on the synergistic coordination between the masticatory and neck muscles during chewing, this study aims at evaluating the potential influence of AIS on the masticatory function. The null hypothesis (H0) is that there is no difference in mastication between subjects with AIS and control subjects.…”