Patent ID: 8348957

Claim:
An instrument assembly for placing a guide pin in a femoral neck of a patient with reference to a medullary guide wire for use in resurfacing a femoral head, the assembly comprising: a femoral neck clamp configured to define a neck center of said femoral neck, the femoral neck clamp including a ring portion and an extension portion extending from the ring portion, the ring portion including a first partial ring portion and a second partial ring portion, the first partial ring portion having a first extension portion extending therefrom, the second partial ring portion having a second extension portion extending therefrom, the first and second extension portions pivotally attached to one another, the extension portion of the femoral neck clamp including a track for receiving an attachment base of the pin guide in a rotatable relationship, a pin guide attached to the femoral neck clamp, the pin guide having a pin guide portion, the pin guide portion configured to define a pin guide path passing through the neck center defined by the femoral neck clamp, a goniometer, the goniometer having a medullary guide wire engagement member and a pin guide engagement portion, the pin guide engagement portion adjustably linked to the medullary guide wire engagement member so as to accommodate patients of various sizes, the pin guide engagement portion configured to maintain a set angle with respect to said medullary guide wire, and the pin guide engagement portion and the pin guide portion configured to engage one another such that the goniometer orients the pin path at the set angle with respect to said medullary guide wire, wherein the pin guide is rotatably attached to the femoral neck clamp such that the pin guide portion can be selectively rotated through a plurality of pin path angles while maintaining the pin path through the neck center defined by the femoral neck clamp, wherein the track includes a tine groove for engaging the at least one tine of the attachment base of the pin guide to thereby selectively secure the pin guide in the track of the femoral neck clamp.