A hip replacement apparatus that normally includes a supporting rod bent into an acute angle at its center with a rounded head on one end. This supporting rod can be received at the pelvis into a pre-assembled housing with a backplate and front plate where the unit can be cemented and/or screwed into the prepared bone at the hip joint. The backplate can have an anchoring protrusion that mates into the trimmed-out bone at the joint. The front plate can have a center hole that receives, and holds from escaping, the rounded head of the supporting rod. The head (and hence the supporting rod) freely rotates captively in the housing with the housing firmly attached to the pelvis. The bottom end of the supporting rod can penetrate into the center of the cut-off femur and can be cemented into the bone. The supporting rod can also be held to the femur with a bone clamp apparatus that can have a thick washer that mounts flat on the face of the cut-off femur and one or more side plates that descend downward along the side of the femur. The thick washer can have a screw hole that runs from its periphery into the center hole of the washer so that a set screw can lock the supporting rod in the washer. The supporting rod can be adjusted up and down during the installation procedure to adjust the leg length of the patient. The side plate can be held to the washer by the set screw through a hole that aligns with the set screw hole in the washer. The side plate can be banded firmly to the femur with one or a more bands that resemble adjustable pipe bands. The bands can wrap around the femur and terminate in tightening screws on the other side of the side plate or in it. The side plate can also optionally include a plurality of penetrating teeth that dig into the bone and grip it more firmly.