Kwallon kafa wasa ne mai haɗari.Rugby dole ne ya zama matsayi na biyu mafi muni a wasanni bayan yaƙi idan duk wasanni ana ɗaukar cutarwa.Menene ainihin kwalkwali na ƙwallon ƙafa a lokacin?A gaskiya, ana iya magance wannan batu cikin sauƙi.Matashin iska a cikin kwalkwalin mai kunnawa yana aiki azaman gyarawa da tsarin kariya.A lokacin wasannin NFL masu zafi, masu tsaron bakin suna da mahimmanci don hana rauni a fuskokin 'yan wasa da hakora.Ƙunƙarar gida, ɓarna fata, raunin haɗin gwiwa, raunin tsoka, da sauran raunin da ya faru sun fi yawa a rugby, amma rikice-rikice suna da alaka da rugby kuma ba za a iya la'akari da cututtuka na rugby ba.Ko da tare da kariyar kwalkwali, ba za a iya hana munanan raunuka gaba ɗaya ba

Ana ganinsa azaman juyi na kayan wasanni, mafi aminci kwalkwali a tarihin NFL.Yawancin 'yan wasan NFL suna sanya wannan kwalkwali.Amma an ƙera shi don tausasa bugun da ke kan shugaban 'yan wasan NFL.Masana kimiyya, likitocin neurosurgeons da injiniyoyin da suka tsara kwalkwali sun bayyana a fili cewa ba zai hana tada hankali ba.Babu kwalkwali da zai iya yin hakan.