E whakamahia whānuitia ana ngā tīwiri ārai i roto i ngā mahi haumanu, inā koa mō te whakapiri i ngā whao roa o roto i te roro.
Ko te tikanga, e rua ngā mahi a ngā tīwiri ārai: tuatahi, hei whakaiti, tuarua, hei whakapiki i te pumau o te whakapiri o roto.
Mō te whakaiti, ka whakamahia te mahi 'ārai' o te tīwiri ārai hei whakarerekē i te ahunga taketake o te whakapiri ā-roto, kia tutuki ai te whakaiti e hiahiatia ana, me te whakatika i te tūnga. I roto i tēnei horopaki, me whakanoho te tīwiri ārai ki te wāhi 'kaua e nekehia', arā, te wāhi kāore e hiahiatia te whakapiri ā-roto. Hei tauira, ko te tibia me te femur:
Mō te tibia: Whai muri i te whakaurunga o te waea ārahi, ka whakanohoia ki te taha o te cortex o muri o te rakau tibial, ka peka atu i te raina waenganui o te awaawa medullary. I te ahunga 'kore e hiahiatia', inā koa te taha o muri o te metaphysis, ka whakauruhia he tīwiri aukati hei ārahi i te waea ki mua i te awaawa medullary.
Femur: I te whakaahua i raro nei, e whakaaturia ana he whao femur whakamuri, me ngā pito whati e whakaatu ana i te koki ki waho. Kei te taha o roto o te awaawa medullary te whao intramedullary. Nō reira, ka whakauruhia he tīwiri ārai ki te taha o roto hei whakatutuki i te huringa o te tūranga o te whao intramedullary.
Mō te whakapakari i te pumau, i te tuatahi i whakamahia ngā tīwiri ārai hei whakapakari i te pumau o ngā whati poto i ngā pito o ngā whati o te kakau tibial. Mā te aukati i te nekehanga o ngā whao intramedullary mā te mahi ārai o ngā tīwiri i ngā taha o roto me waho, e whakaaturia ana i te tauira o te whati femoral intercondylar me supracondylar i raro nei, ka taea te whakapakari i te pumau o ngā pito whati. Ka āwhina tēnei ki te aukati i te nekehanga piu o te whao intramedullary me ngā kongakonga wheua tawhiti.
Waihoki, i te whakapiringa o ngā whati tibial mā te whakamahi i ngā whao intramedullary, ka taea hoki te whakamahi i ngā tīwiri aukati hei whakarei ake i te pumau o ngā pito whati.
Te wā tuku: Hui-tanguru-02-2024
