Assessment of female ballet dancers’ ankles in the<i>en pointe</i>position using high field strength magnetic resonance imaging

Russell, Jeffrey A.; Yoshioka, Hiroshi

doi:10.1177/0284185115616295

Cited by 10 publications

(15 citation statements)

References 29 publications

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“…There was the pain in type III os trigonum, which was mostly caused by the thickening of the posterior capsule of ankle joint caused by impacted tenosynovitis of pollicis longus muscle and edema of soft tissue around it [18,24]. In the case of fracture of the neck of the talus, type III os trigonum could be used for the posterior approach screw implantation and internal fixation [7,12]. The measurement of the macro- and minor-axis, position relationship, and distance as the point of entry provided the basis for estimating the diameter of the bone tunnel and the length of screw [25–28], and it was more suitable for the general public.…”

Section: Discussionmentioning

confidence: 99%

Implications of Classification of Os Trigonum: A Study Based on Computed Tomography Three-Dimensional Imaging

Fu¹,

Zeng

et al. 2019

Med Sci Monit

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Background The os trigonum is an accessory bone that is not fully fused with the talus during secondary ossification, and is one of the risk factors of posterior malleolus impact syndrome. The purpose of this study was to classify the os trigonum and to guide the diagnosis and treatment of related clinical diseases. Material/Methods Ankle computed tomography (CT) scans of 586 Chinese patients between October 2014 and October 2018 were reviewed. CT images of 1011 ankle joints were reconstructed to evaluate the classification of the os trigonum and the measurement of anatomical parameters. Results The incidences of os trigonum in 3 groups were determined as type I (1.9%), type II (10.5%), and type III (14.7%). The macro-axis of type II (0.89±0.31) cm was significantly larger than with type I (0.65±0.24 cm) and type III (0.74±0.23 cm) (p<0.05).The minor axis of similar of type I (0.41±0.23 cm) was significantly shorter than that of type II (0.58±0.32 cm) and type III (0.55±0.16 cm) (p<0.05).The distance from os trigonum to calcaneal tubercle was significantly different than that of type I (1.33±0.52 cm), type II (1.67±0.55 cm), and type III (1.84±0.45 cm) (p<0.05). Conclusions This study showed that os trigonum has a high incidence. Type I was the least common, the volume of type II was larger, and type III was more common. The anatomical parameters of each type may improve treatment of related diseases and the further development of ankle arthroscopic surgery.

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Section: Discussionmentioning

confidence: 99%

Implications of Classification of Os Trigonum: A Study Based on Computed Tomography Three-Dimensional Imaging

Fu¹,

Zeng

et al. 2019

Med Sci Monit

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“…Significant differences have been found in the average EMG of tibialis anterior when Latin dancers danced wearing different heel height shoes [18]. Jeffrey et al [14] noted incongruence of the talocrural joint and convergence of the tibia, talus, and calcaneus posteriorly. All these adaptations and changes were due to special dance-required postures and trainings.…”

Section: Discussionmentioning

confidence: 99%

“…It has been proved that ballet dancers had a special gait pattern compared with the non-dancers [8]. However, the previous study about dancers' plantar pressure and other musculoskeletal system parameters mainly focused on ballet and Latin or other dance types, rarely on Chinese Classic Dance [9][10][11][12][13][14][15]. It is an important issue for China Classic Dancers, trainers and learners to know the typical gait patterns and the relevant prevention.…”

Section: Introductionmentioning

confidence: 99%

Analysis of characteristics in China classic dancers' gait pattern

Zhao¹,

Liu²,

Zhang³

et al. 2018

LFJ

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ANALYSIS OF CHARACTERISTICS IN CHINA CLASSIC DANCERS' GAIT PATTERN ABSTRACT. China Classic Dance is one of the most important and popular dancing in China and has become more and more popular from all over the world. However, the special gait patterns for the China Classic Dancers are not clear. The purpose of this study was to compare the characteristics of plantar pressure distribution in the China Classic Dancers and the non-dancers, and recognize if force transference happened. Gait data (PP, Fmax, PTI, FTI and FTIrel) from 93 China Classic Dancers and 30 non-dancers were analyzed. The plantar force transference was accessed with a load-transfer algorithm. Significant differences were found in plantar pressure distribution between the two groups: 1. maximum forces for China Classic Dancers significantly lower than the control group except the T1 and M2 regions; 2. peak pressures showed significant decrease in the China Classic Dancers except the M2 region; 3. the force-time integrals and pressure-time integrals in each region reduced significantly in comparison with the controls; 4. main significant load transferences were observed from T1, lateral forefoot (M3-5), midfoot and HM regions to the medial forefoot (M1-2) areas (T1, M3-5, MF, HM→M1-2). And the medial to lateral transferences were typical in toes and heel regions (T1→T2-5, HM→HL). These results suggested a typical gait patterns for the China Classic Dancers. Further investigation is needed in sports biomechanics and injuries for this special population. KEY WORDS: China Classic Dance, plantar pressure, load transference ANALIZA CARACTERISTICILOR TIPARULUI DE MERS AL DANSATORILOR DE DANS CLASIC CHINEZESC REZUMAT. Dansul clasic chinezesc este unul dintre cele mai importante şi populare dansuri din China şi a devenit unul dintre cele mai populare din întreaga lume. Cu toate acestea, tiparele de mers specifice dansatorilor de dans clasic chinezesc nu sunt clare. Scopul acestui studiu a fost de a compara caracteristicile distribuţiei presiunii plantare ale dansatorilor de dans clasic chinezesc şi ale non-dansatorilor şi de a determina dacă a avut loc transferul de forţă. S-au analizat date privind mersul (PP, Fmax, PTI, FTI şi FTIrel) preluate de la 93 de dansatori de dans clasic chinezesc şi 30 de non-dansatori. Transferul forţei plantare a fost măsurat cu un algoritm de transfer de greutate. S-au constatat diferenţe semnificative în distribuţia presiunii plantare între cele două grupuri: 1. forţele maxime la dansatorii de dans clasic chinezesc au fost semnificativ mai mici decât în cazul grupului martor, cu excepţia regiunilor T1 şi M2; 2. presiunile maxime au prezentat o scădere semnificativă în cazul dansatorilor, cu excepţia regiunii M2; 3. integralele forţă-timp şi presiune-timp au scăzut semnificativ în fiecare regiune în comparaţie cu grupul martor; 4. principalele transferuri semnificative de greutate au fost observate din zona T1, zona antepiciorului lateral (M3-5), zona mediană şi HM către antepiciorul median (M1-2) (T1, M3-5, MF, HM→M1-2). T...

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“…Because of the high levels of physically demanding training (9), ballet dancers' joints can be subjected to impact loading and repeated microtrauma (6). In particular, ballet dancing en pointe requires absolutely maximum plantar flexion (10), resulting in incongruence of the talocrural joint (11). However, there is little understanding about the effect of position-related mechanical loading and early compositional changes in articular cartilage of professional dancers.…”

Section: Introductionmentioning

confidence: 99%

T1rho and T2 mapping of ankle cartilage of female and male ballet dancers

Horiuchi

Luk

et al. 2020

Acta Radiol

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Background Since ballet dancers begin their training before skeletal maturity, accurate and non-invasive identification of cartilage diseases is clinically important. Angle-dependent analysis of T1rho and T2 sequences can be useful for quantification of the composition of cartilage. Purpose To investigate the angle-dependent T1rho and T2 profiles of ankle cartilage in non-dancers and dancers. Material and Methods Ten female non-dancers, ten female dancers, and 9 male dancers were evaluated using T1rho and T2 mapping sequences. Manual segmentation of talar and tibial cartilage on these images was performed by two radiologists. Inter- and intra-rater reliabilities were calculated using intraclass correlation coefficients (ICCs) and Bland–Altman analysis. Mean thickness and volume of cartilage were estimated. Angle-dependent relaxation time profiles of talar and tibial cartilage were created. Results ICCs of the number of segmented pixels were poor to excellent. Bland–Altman plots indicated that differences were associated with segment sizes. Segmented cartilage on T1rho demonstrated larger thickness and volume than those on T2 in all populations. Male dancers showed larger cartilage thickness and volume than female dancers and non-dancers. Each cartilage demonstrated angular-dependent T1rho and T2 profiles. Minimal T1rho and T2 values were observed at approximately 180°–200°; higher values were seen at the angle closer to the magic angle. Minimal T2 value of talar cartilage of dancers was larger than that of non-dancers. Conclusion In this small cohort study, regional and sex variations of ankle cartilage T1rho and T2 values in dancers and non-dancers were demonstrated using an angle-dependent approach.

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Assessment of female ballet dancers’ ankles in theen pointeposition using high field strength magnetic resonance imaging

Cited by 10 publications

References 29 publications

Implications of Classification of Os Trigonum: A Study Based on Computed Tomography Three-Dimensional Imaging

Implications of Classification of Os Trigonum: A Study Based on Computed Tomography Three-Dimensional Imaging

Analysis of characteristics in China classic dancers' gait pattern

T1rho and T2 mapping of ankle cartilage of female and male ballet dancers

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