Directing the guide includes a housing configured to couple to a surgical instrument. In one embodiment, directing the guide further comprises a second indicator and the first (22, 26). The first indicator (22) is pivotally connected to the (20) housing, the first indicator (22) rotates relative to the housing (20) and (24) about the first axis, the housing ( it is not related to the movement of the 20), to maintain the angular position of (24) about the first axis with respect to the vertical axis. Indicator and the second (26) and surrounds indicator of the first (22) and is pivotally connected to the housing (20), the indicator and the second (26), perpendicular to the (24) first axis rotated with respect to the housing (20) and (32) about a second axis that, regardless of the movement housing (20), to maintain the angular position (32) about a second axis relative to the vertical axis I can be. Angular position of the housing (24, 32) about first and second axes (20) is indicated by the position of (22) the first indicator to (26) the second indicator. In a second embodiment, the housing (2), I includes a cavity filled with fluid. (4) is supported in a fluid indicator, the indicator (4), is rotated with respect to the housing (2) about the first axis, regardless of the movement of the housing (2), first with respect to the vertical axis It is possible to maintain the angular position about the axis of the. Indicator (4), and a mark that is configured to indicate the angular position indicator housing at about the first axis with respect to (2) and (4). Housing (2) has a transparent portion of at least one for viewing the mark. Is configured to be coupled housing (2), by sliding the housing (2), the measuring element (8), to align the mark indicator, the angular position the housing at about the first axis (2) can be recorded.方向付けガイドは、外科器具に連結するように構成されたハウジングを含む。一実施形態では、方向付けガイドは、第1および第2のインジケーター(22、26)をさらに含む。第1のインジケーター(22)は、ハウジング(20)に旋回可能に連結され、第1のインジケーター(22)は、第1の軸(2
