This invention relates to an osteoarticular screw with minor amount of movement, which includes an actuation part formed of an elastic material to provide a joint surface of a sacroiliac joint contacting the actuation part with a minor amount of movement and a twist capability, so as to mitigate the influence of force concentration on the hip, thereby preventing lower limb degradation. Furthermore, with a swingable design of a washer fit to a screw head part, the influence of bone surface irregularities can be overcome and an effect of compression is reduced, thereby preventing the possibility of slipping or breaking of the osteoarticular screw, so as to resolve the occurrence that the lower limbs are prone to degeneration after performing the treatment of sacroiliac joint fusion.本發明係有關一種具有微動量之骨關節螺釘，藉由彈性材料所組成的作動部，使骶髂關節與作動部接觸的關節面保有微動量及扭轉能力，減輕力量集中在髖部的影響，進而預防下肢退化；並進一步藉由套設於螺頭部上之墊片的可擺動之設計，解決骨骼表面不規則的影響以及減輕加壓效果，進而預防骨關節螺釘滑脫或斷裂的可能性，以解決進行骶髂關節融合術之治療方式後，下肢容易產生退化的情況發生。
