Provided is a bone connector that has a wide range of fixing positions or fixing methods that can be selected during reduction surgery while being a single instrument, can firmly fix the affected area, and can reduce discomfort felt in the affected area after treatment. The bone connector D1 is an instrument for fixing and reducing each bone fragment at the time of fracture of the ulna on the elbow head side, and is attached to the intramedullary nail 1 to be inserted into the ulna 3 and the outer surface of the ulna on the elbow head 31 side. An end plate 2a and a screw N1 for screwing the end plate to the intramedullary nail are provided. A screw S is used to fix the intramedullary nail 1 after the insertion to the ulna 3 in combination with the bone connector D1. An intramedullary nail 1 having a tapered round rod body with a thickness and a required length that fits into the medullary ulna has a screw hole 111 formed on the base end face 101 and a base end side from the center of the peripheral face 102. Long holes 114 and 115 formed closer to each other, and circular holes 112 and 113, 116 to 118 formed at required portions on the front surface side to the base end side of the peripheral surface 102 are provided.一の器具でありながら整復手術時に選択しうる固定位置又は固定方法の幅が広く、患部の強固な固定が可能で、施術後の患部に感じる違和感等を軽減する骨接合具を提供する。 骨接合具Ｄ１は、尺骨の肘頭側の骨折時に各骨片を固定し整復するための器具であり、尺骨３へ挿入する髄内釘１、尺骨の肘頭３１側の外面に取着するエンドプレート２ａ、同エンドプレートを髄内釘へ螺着するためのネジＮ１を備える。骨接合具Ｄ１と組み合わせ、挿入後の髄内釘１を尺骨３に固定等するために、スクリューＳを用いる。先端部が先細な丸棒体で、尺骨の髄内に入る太さと所要の長さを有する髄内釘１は、基端面１０１に形成されたネジ孔１１１、周面１０２中央部から基端側寄りに形成した長孔１１４と１１５、周面１０２先部側乃至基端側の所要箇所に形成した円孔１１２と１１３，１１６乃至１１８を備える。
