1.5 dunƙule hakowa kai

Ƙaƙƙarfan bayanin martaba mara ƙanƙanta masu ɓarna gefuna da faɗin bayanin martabar faranti suna ba da kusan babu tawul. Akwai a cikin ƙarin na musamman tsayi.

Amfanin titanium alloy sukurori:

1. Babban ƙarfi. Girman titanium yana da 4.51g/cm³, sama da na aluminum kuma ƙasa da na ƙarfe, jan ƙarfe da nickel, amma ƙarfin ya fi na sauran karafa. Dunƙule da aka yi da titanium gami yana da haske da ƙarfi.
2. Kyakkyawan juriya na lalata, titanium da titanium gami a cikin kafofin watsa labarai da yawa suna da kwanciyar hankali, ana iya amfani da sukurori na alloy na titanium zuwa yanayi iri-iri mai sauƙi.
3. Kyakkyawan juriya mai zafi da ƙarancin zafin jiki.Titanium alloy screws na iya aiki a yanayin zafi har zuwa 600 ° C da rage 250 ° C, kuma suna iya kula da siffar su ba tare da canzawa ba.
4. Ba magnetic, ba mai guba ba.Titanium wani ƙarfe ne wanda ba zai yiwu ba kuma ba zai zama magnetized a cikin manyan filayen magnetic ba.
5. Strong anti-damping performance.In kwatanta da karfe da jan karfe, titanium yana da mafi tsawo vibration attenuation lokaci bayan inji vibration da lantarki vibration.This yi za a iya amfani da matsayin kunna cokali mai yatsu, vibration aka gyara na likita ultrasonic grinders da vibration fina-finan na ci-gaba audio lasifika.

Zane zane don saurin dunƙule farawa da ƙananan karfin juyi. Faɗin zaɓi na faranti da raga, gami da mastoid da meshes na ɗan lokaci, da murfin burar rami don shunts.

Da matsi da dunƙule, mafi kyau?

Ana amfani da sukurori a aikin tiyata na kashin baya don damfara wurin da ya karye, gyara farantin zuwa kashi, da kuma gyara kashin zuwa firam ɗin gyarawa na ciki ko na waje.Matsin da ake amfani da shi don matse dunƙule cikin kashi ya yi daidai da ƙarfin ƙarfin da likitan tiyata ya yi.

Duk da haka, yayin da karfin juzu'i ya karu, screw yana samun matsakaicin karfin juzu'i (Tmax), a lokacin da aka rage karfin screw a kan kashi kuma an fitar da shi kadan. Ana amfani da shi sau da yawa azaman ma'auni don auna ƙarfin riƙewa na dunƙule. A halin yanzu, dangantakar da ke tsakanin matsakaicin ƙarfi da ƙarfin cirewa har yanzu ba a san shi ba.

A asibiti, likitocin orthopedic yawanci suna saka dunƙule tare da kusan 86% Tmax. Duk da haka, Cleek et al. An gano cewa 70% Tmax dunƙule saka a kan tibia na tumaki zai iya cimma matsakaicin POS, yana nuna cewa za a iya amfani da karfin juzu'i mai yawa a asibiti, wanda zai rage kwanciyar hankali.

Wani bincike na kwanan nan na humerus a cikin mahaɗan ɗan adam ta Tankard et al. ya gano cewa an samu mafi girman POS a 50% Tmax. Babban dalilan da ke haifar da bambance-bambance a cikin sakamakon da ke sama na iya zama rashin daidaituwa na samfurori da aka yi amfani da su da kuma ma'auni daban-daban.

Saboda haka, Kyle M. Rose et al. daga Amurka sun auna dangantakar da ke tsakanin Tmax daban-daban da POS ta hanyar sukurori da aka saka a cikin tibia na cadavers na mutum, kuma sun yi nazarin dangantakar da ke tsakanin Tmax da BMD da kauri na cortical kashi. An buga takarda kwanan nan a cikin Dabaru a Orthopaedics. Sakamakon ya nuna cewa za a iya samun matsakaicin da irin wannan POS a 70% da 90% Tmax da 90% Tmax tare da POSmax da 90% Tmax. karfin juyi yana da girma fiye da na 100% Tmax. Babu wani bambanci a cikin BMD da kauri na cortical tsakanin ƙungiyoyin tibia, kuma babu wani dangantaka tsakanin Tmax da na sama biyu. Saboda haka, a cikin aikin asibiti, likitan likitancin bai kamata ya ƙarfafa dunƙule tare da matsakaicin ƙarfin juyi ba, amma tare da karfin juyi kadan kasa da Tmax. Ko da yake 70% da 90% Tmax na iya cimma irin wannan POS, har yanzu akwai wasu fa'idodi don overtighting dunƙule, amma karfin juyi dole ne ya wuce 90%, in ba haka ba za a shafa tasirin gyarawa.

Tushen: Dangantakar Tsakanin Ƙarfin Ƙarfin Ƙarfin Ƙarfin Fida da Ƙarfin Fida.Hanyoyin Dabaru a Orthopeedics: Yuni 2016 - Juzu'i 31 - Fitowa ta 2 - p 137-139.