Singano yolumikizira kunja ndi chipangizo chachipatala chomwe chimagwiritsidwa ntchito pa opaleshoni ya mafupa kuti chikhazikitse ndikuchirikiza mafupa kapena zimfundo zosweka kuchokera kunja kwa thupi. Njira imeneyi ndi yothandiza makamaka pamene njira zolumikizira mkati monga mbale zachitsulo kapena zomangira sizili zoyenera chifukwa cha mtundu wa kuvulala kapena mkhalidwe wa wodwalayo.
Kumangirira kwakunja kumaphatikizapo kugwiritsa ntchito singano zomwe zimalowetsedwa kudzera pakhungu kupita ku fupa ndikulumikizidwa ku chimango cholimba chakunja. Chimangochi chimakhazikitsa zikhomo pamalo pake kuti zikhazikitse malo osweka pomwe zimachepetsa kuyenda. Ubwino waukulu wogwiritsa ntchito singano zomangira zakunja ndikuti zimapereka malo okhazikika ochiritsira popanda kufunikira opaleshoni yayikulu.
Chimodzi mwa ubwino waukulu wa singano zomangira zakunja ndikuti zimatha kulowa mosavuta pamalo ovulala kuti ziwunikiridwe ndi kuchiritsidwa. Kuphatikiza apo, zitha kusinthidwa pamene njira yochiritsira ikupita patsogolo, zomwe zimapangitsa kuti pakhale kusinthasintha kwa kasamalidwe ka kuvulala.
| Mtundu | Kufotokozera |
| Kudzibowola ndi Kudzigwira (kwa phalanges ndi metacarpals) Mphepete mwa Makona Atatu Zakuthupi: Aloyi wa Titanium | Φ2 x 40mm Φ2 x 60mm |
| Kudzibowola ndi Kudzigwira Zakuthupi: Aloyi wa Titanium | Φ2.5mm x 60mm Φ3 x 60mm Φ3 x 80mm Φ4 x 80mm Φ4 x 90mm Φ4 x 100mm Φ4 x 120mm Φ5 x 120mm Φ5 x 150mm Φ5 x 180mm Φ5 x 200mm Φ6 x 150mm Φ6 x 180mm Φ6 x 220mm |
| Kudzigwira wekha (kwa fupa loletsa kuvulala) Zakuthupi: Aloyi wa Titanium | Φ4 x 80mm Φ4 x 100mm Φ4 x 120mm Φ5 x 120mm Φ5 x 150mm Φ5 x 180mm Φ6 x 120mm Φ6 x 150mm Φ6 x 180mm |