A medical device for delivering an action to an area of a hip joint or its surroundings, inside a human body of a patient, the hip joint comprising a collum femur and a ball shaped caput femur, and an acetabulum, said medical device comprising; - an elongated member, having a first end, a second end, a length axis along its elongated distribution, and a first portion being adjacent to said first end, wherein said first portion of said elongated member is adapted to enter the body of the patient and comprises a first portion cross-section area substantially perpendicular to the length axis of the elongated member, wherein said first portion is adapted to pass through a hole in a bone of the patient, the hole having a hole cross-section area, wherein said first portion cross-section area is smaller than said hole cross-section area, the first portion comprising: i. a mounting portion, and ii. a holding member adapted to hold a mechanical element (224,225,226) inside the body of said patient, and - a mechanical element (224,225,226) having a functional status ready to deliver an action inside the body when held by said holding member inside the body of the patient, wherein said mechanical element has a mechanical element cross-section area substantially perpendicular to the length axis of the elongated member, being substantially larger than said first portion cross-section area and unable to pass through the hole when said mechanical element is in said functional status, characterized in that the mechanical element comprises at least one mounting recess for mounting the mechanical element onto the mounting portion of the elongated member in a direction substantially perpendicular to the length axis of the elongated member, such that a user of the medical device can mount the mechanical element on the elongated member without having access to the first end of the elongated member, wherein said mechanical element is adapted to be used during an operation in the hip joint or its surroundings, when placed inside the body. - an elongated member, having a first end, a second end, a length axis along its elongated distribution, and a first portion being adjacent to said first end, wherein said first portion of said elongated member is adapted to enter the body of the patient and comprises a first portion cross-section area substantially perpendicular to the length axis of the elongated member, wherein said first portion is adapted to pass through a hole in a bone of the patient, the hole having a hole cross-section area, wherein said first portion cross-section area is smaller than said hole cross-section area, the first portion comprising: i. a mounting portion, and ii. a holding member adapted to hold a mechanical element (224,225,226) inside the body of said patient, and i. a mounting portion, and ii. a holding member adapted to hold a mechanical element (224,225,226) inside the body of said patient, and - a mechanical element (224,225,226) having a functional status ready to deliver an action inside the body when held by said holding member inside the body of the patient, wherein said mechanical element has a mechanical element cross-section area substantially perpendicular to the length axis of the elongated member, being substantially larger than said first portion cross-section area and unable to pass through the hole when said mechanical element is in said functional status, characterized in that the mechanical element comprises at least one mounting recess for mounting the mechanical element onto the mounting portion of the elongated member in a direction substantially perpendicular to the length axis of the elongated member, such that a user of the medical device can mount the mechanical element on the elongated member without having access to the first end of the elongated member, wherein said mechanical element is adapted to be used during an operation in the hip joint or its surroundings, when placed inside the body.