samedi, février 16, 2008

Un autre tendon d’Achille saute en skiant

Hier, j’apprenais que mon ami John Evans venait de se rompre le tendon d'Achille en faisant du ski hors-piste à Vail. D’après ce qu'il m'a dit, la talonnière de sa fixation n’a pas fonctionné, et quand je lui ai demandé qu’elles étaient ses chaussures de ski, il m’a dit qu’il s’agissait d’une paire de Surefoot Lange. Une coïncidence troublante, car nous sommes maintenant deux skieurs qui nous sommes rompu le tendon avec ce type de chaussure. Ma réaction immédiate est que sous l’effet d’une décélération très sévère, le collier supérieur de la chaussure s’est littéralement écrasé sur le bas de la coque occasionnant une déformation élastique totale du premier et dépassant ainsi l’angle de rupture du tendon.
En ski, la rupture du tendon d’Achile est assez rare, et il serait intéressant de voir ce qui aurait pu se passer, dans les mêmes circonstances, avec une construction de chaussure différente comme par exemple une coque en trois pièces du type Flexon ou DalBello Krypton ? Intuitivement, je pense que la languette pivotante qui joue le rôle de ressort aurait bien résisté à la surpression sans céder sous la charge, et que la chute avant de la fixation aurait alors fonctionné en libérant le pied dans la mesure où celle-ci était réglée raisonnablement.

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Je suis assez d'accord avec toi, je me souviens que lorsque je skiais avec Lange par obligation, je trouvais ces chaussures plutôt raides et il m'arrivait de ressentir des douleurs au niveau du tendon.
Dès que j'ai skié avec des Flexon Raichle, j'ai immédiatement apprécié leurs souplesses et la douceur des amortis.
Je dois ajouter qu'avec les skis paraboliques, j'ai pu tester les mêmes skis avec des Flexon et avec des F1 (également des Raichle) et ai pu sentir que l'on profite mieux des caractéristiques des skis avec la Flexon qu'avec la F1 plus raides.
En fait avec ces dernières je devais forcer beaucoup plus sur la languette pour tailler les mêmes courbes et de plus les F1 me renvoyaient en arrière m'obligeant à un basculement rapide vers l'avant pour attaquer le virage suivant.
Je peux donc imaginer qu'une chaussure encore plus raide comme la Lange augmente encore ce phénomène jusqu' à provoquer de réel problème en cas de difficulté de terrain ou perte d'équilibre.
On peut également repprocher aux skis paraboliques utilisés avec des chaussures trop raides le nombre impressionant de blessures aux genoux rencontrés chez les skieurs de haut niveau.

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