Ko da yake masu bincike sun yarda cewa hakora hakora ne mai rikitarwa tsari, akwai kadan yarjejeniya a kan ainihi na inji cewa iko da fashewa. Wasu kullum gudanar theories cewa an disproved a tsawon lokaci sun hada da: (1) hakora da aka tura sama a cikin bakinka da ci gaban hakora tushen, (2) hakora da aka tura sama da ci gaban da kashi a kusa da hakora, (3) hakora da aka tura sama da jijiyoyin jini matsa lamba, da kuma (4) hakora da aka tura sama da cushioned hammock. The cushioned hammock ka'idar, da farko da aka gabatar da Harry Sicher, da aka koyar a ko'ina daga 1930s zuwa 1950s. Wannan ka'idar postulated cewa a farko ligament zuwa hakora, wanda aka lura a karkashin wani microscope a kan wani histological hakora fall a kan wani lokaci daban-daban, akwai kadan yarjejeniya a kan ainihi na inji cewa sarrafa hakora da aka gudanar a cikin bakinka.
ligament a karkashin hakori, wanda Sicher lura a karkashin wani microscope a kan wani histological nunin faifai, shi ne alhakin fashewa