A screw-clamp apparatus is disclosed that may include a first clamp component comprising a first attachment end and at least one hook on a first hook end, a second clamp component comprising a second attachment end and at least one hook on a second hook end, a bone-screw hole located in one of the first clamp component and the second clamp component, a bone screw configured to be inserted through the bone-screw hole and to be inserted into bone, a first spacer-receiver located on one of the first clamp component and the second clamp component, and a length adjusting mechanism configured to adjust a longitudinal length of the screw-clamp apparatus. The first attachment end and the second attachment end are configured to attach the first clamp component and the second clamp component together. The first spacer-receiver is configured to secure a spacer.