Abstract

There are several schemes for classification of lateral end clavicular fractures. Of these, the Neer
classification is most widely used, Neer type I fractures are minimally displaced fractures that
occur between or lateral to the intact coraco-clavicular ligaments. Neer type II fractures occur at
the level of coraco-clavicular ligaments, with the trapezoid ligament remaining attached to the
distal segment. Type II fractures can be further subdivided into type IIA, in which the conoid and
trapezoid ligaments both remain attached to the distal fragment, and type IIB, in which the conoid
ligament is torn. Type III injuries are intraarticular fractures that enter ACJ. Type IV fractures
occur in children and they are considered physeal injuries. Type V fractures are multifragmentary
fractures.The clavicle hook plate is designed to treat this problem by maintaining the acromioclavicular
joint biomechanics and this allows early mobilization and avoids the need for
reconstruction of the coraco-clavicular ligament.