| abstract |
Embodiments of the bone anchor assembly ( 36, 50 ) described herein have adjustable lengths and therefore accommodate many needs. Therefore, the physician does not need to maintain a multitude of bone anchors having a variety of lengths in order to be prepared for many situations. The bone anchor assembly ( 36, 50 ) has an elongated hollow shaft portion ( 38, 52 ) formed of multiple shaft segments ( 46, 58 ) joined together. The length of the shaft portion ( 38, 52 ) is adjusted after the implanting of the bone anchor assembly into the bone by removing shaft segments ( 46, 58 ). |