A device (10) for guiding a drilling of a femoral head (B) of a femur (A) in femoral head resurfacing comprises a body (11) defining a guide channel (42,43) adapted to receive and guide a drilling component therein. Arms (15) are pivotally connected to the body and biased toward one another, the arms each having a contact end (52) extending below the body, the contact ends adapted to contact a femoral neck (C) when the body is in a hovering position relative to the femoral head. Sensors (36) produce a signal indicative of an orientation angle of each of the arms relative to the body. A processor unit (35) calculates the orientation angles of the arms from the signal, and evaluates from the orientation angles an alignment of the body relative to the femur. A visual output (37) produces a visual signal representative of said alignment. The device can be used in a method for aligning a drill guide device on a femur for subsequent drilling a femoral head with a guide channel in the drill guide device.
