A reamer guide system comprising: a reamer guide including: a guide base having a base body that is configured to be positioned adjacent to at least two bones (30, 34, 38, 42), wherein the at least two bones are selected from the group consisting of a lunate, a capitate, a hamate, and a triquetrum, the guide base defining 1) a guide aperture that extends through the base body and is configured to receive a reamer and directs the reamer towards the at least two bones (30, 34, 38, 42) when the base body is positioned adjacent to the at least two bones (30, 34, 38, 42), and 2) at least two bores that extend through the base body at a location so as to be aligned with each of the at least two bones (30, 34, 38, 42), respectively, when the base body is positioned adjacent to the at least two bones (30, 34, 38, 42), wherein the guide aperture extends along a central axis, and the bores extend along respective central axes that extend substantially parallel to the central axis of the guide aperture, wherein each bore is configured to receive respective temporary fixation elements configured to secure to the at least two bones (30, 34, 38, 42), respectively, so as to hold the at least two bones (30, 34, 38, 42) relative to each other as the reamer advances into the at least two bones(30, 34, 38, 42), characterized in that the system further comprises a positioning aid (214; 414) that is configured to be received by the guide aperture, the positioning aid (214; 414) including: an aid base (230; 430) that is configured to be positioned adjacent the at least two bones (30, 34, 38, 42); and a locating bore (238; 438) that extends through the aid base (230; 430), wherein the locating bore (238; 438) is configured to receive a temporary fixation element. a reamer guide including: a guide base having a base body that is configured to be positioned adjacent to at least two bones (30, 34, 38, 42), wherein the at least two bones are selected from the group consisting of a lunate, a capitate, a hamate, and a triquetrum, the guide base defining 1) a guide aperture that extends through the base body and is configured to receive a reamer and directs the reamer towards the at least two bones (30, 34, 38, 42) when the base body is positioned adjacent to the at least two bones (30, 34, 38, 42), and 2) at least two bores that extend through the base body at a location so as to be aligned with each of the at least two bones (30, 34, 38, 42), respectively, when the base body is positioned adjacent to the at least two bones (30, 34, 38, 42), wherein the guide aperture extends along a central axis, and the bores extend along respective central axes that extend substantially parallel to the central axis of the guide aperture, wherein each bore is configured to receive respective temporary fixation elements configured to secure to the at least two bones (30, 34, 38, 42), respectively, so as to hold the at least two bones (30, 34, 38, 42) relative to each other as the reamer advances into the at least two bones(30, 34, 38, 42), a guide base having a base body that is configured to be positioned adjacent to at least two bones (30, 34, 38, 42), wherein the at least two bones are selected from the group consisting of a lunate, a capitate, a hamate, and a triquetrum, the guide base defining 1) a guide aperture that extends through the base body and is configured to receive a reamer and directs the reamer towards the at least two bones (30, 34, 38, 42) when the base body is positioned adjacent to the at least two bones (30, 34, 38, 42), and 2) at least two bores that extend through the base body at a location so as to be aligned with each of the at least two bones (30, 34, 38, 42), respectively, when the base body is positioned adjacent to the at least two bones (30, 34, 38, 42), wherein the guide aperture extends along a central axis, and the bores extend along respective central axes that extend substantially parallel to the central axis of the guide aperture, wherein each bore is configured to receive respective temporary fixation elements configured to secure to the at least two bones (30, 34, 38, 42), respectively, so as to hold the at least two bones (30, 34, 38, 42) relative to each other as the reamer advances into the at least two bones(30, 34, 38, 42), characterized in that the system further comprises a positioning aid (214; 414) that is configured to be received by the guide aperture, the positioning aid (214; 414) including: an aid base (230; 430) that is configured to be positioned adjacent the at least two bones (30, 34, 38, 42); and a locating bore (238; 438) that extends through the aid base (230; 430), wherein the locating bore (238; 438) is configured to receive a temporary fixation element. an aid base (230; 430) that is configured to be positioned adjacent the at least two bones (30, 34, 38, 42); and a locating bore (238; 438) that extends through the aid base (230; 430), wherein the locating bore (238; 438) is configured to receive a temporary fixation element.