HINGED POLYAXIAL SCREW AND METHODS OF USE

摘要

A bone-anchoring device (100) is provided. The device may include a substantially rigid shaft (160) having a threaded portion configured to engag bone. The bone- anchoring device may further include a head portion (180) securely attached to the shaft and a cap portion (200) having a hinged connection (220) with the head portion. A substantially spherical cavity(240) may be formed between the head portion and the cap portion.