29/03/2007
AO Technical Commission Approved

LCP Clavicle Hook Plate

The LCP Clavicle Hook Plate is a fixation system with angular stability for both lateral clavicle fractures and acromioclavicular joint injuries. It is indicated for luxation of the AC-joint (Type III, classified by Tossy, or Type III, IV, and V, classified by Rockwood) and lateral shaft fracture of the clavicle (Type II, classified by Neer, or Type II, classified by Jger and Breitner).

The design of the LCP Clavicle Hook Plate includes several new features compared to the existing Clavicle Hook Plate. It implements the LCP concept with elongated combination holes (threaded hole for locking head screws (LHS) and dynamic compression unit (DCU) for cortex screws). Further improvements are a precontoured plate shaft (12 angulation) for better anatomic fit, undercuts, tapered plate end and rounded edges, a hook offset of 5 mm, and tapered hook geometry.

The LCP Clavicle Hook Plate will be provided in four different lengths, with 14 elongated LCP combination holes in the shaft portion. These allow the application of 3.5 mm locking head screws as well as 3.5 mm cortex or 4.0 mm cancellous bone screws. The hook will be offered in three different sizes; 12, 15, and 18 mm.

The new trial implants for intraoperative implant size determination are made out of stainless steel (to be visible under image intensification) and will be offered in a right and left version with three different hook sizes (12, 15, and 18 mm). The hook has the same dimensions as the LCP Clavicle Hook Plate implant. The trial implants are particularly important for use in conjunction with sterile packaged implants.


Further Reading

Fadel GE, Scullion JE (2002). Hook plate fixation for lateral clavicular malunionAO Dialogue; Volume 15, Issue 1: 14

Concha JM, Illera J, Daza C, Quintero J, Cruz C (2005). Stabilization of Acute Type III AC Joint Dislocations with a Hook ImplantAO Dialogue; Volume 18, Issue 3: 22-27

Case provided by Norbert Sdkamp, Freiburg im Br.

Fig.
Preoperative x-rays


Fig.
Postoperative x-rays


Fig.
Follow-up x-ray after 10 weeks. Begining ossification in coracoclavicular ligament.


Fig.
Follow-up x-ray after 5 month. Stable AC joint, full function. Persisting ossification in coracoclavicular ligament without clinical relevance.Follow-up x-ray after 10 weeks. Begining ossification in coracoclavicular ligament.

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