A bone fixation device including a retainer and an anchor. The retainer includes first and second receiving regions. The first receiving region is configured for receipt of a connecting rod. The second receiving region is configured for receipt of an anchor. The first receiving region is constructed so that a connecting rod can be positioned within the receiving region at a number of non-coaxial orientations. The first receiving region is also constructed to accommodate a curved connecting rod. A flexible, integral locking structure is located between the first and second receiving regions. The locking structure is arranged to secure each of the retainer, an anchor, and a connecting rod in a position relative to one another.