Clinical Scorecard: Biomechanical Evaluation of Clavicular Hook Plates Compared to Adjustable Loop Plates for Neer Type IIB Distal Clavicle Fractures Using Finite Element Analysis

At a Glance

Key Highlights

• Both clavicular hook plates and adjustable strap plates provide adequate biomechanical stability for Neer Type IIB distal clavicle fractures.
• Clavicular hook plates show smaller maximum clavicle deformation but higher equivalent stress at the clavicular path node compared to adjustable strap plates.
• Adjustable strap plates reduce risk of subacromial impingement and allow simultaneous arthroscopic management of concomitant shoulder injuries without requiring implant removal.

Guideline-Based Recommendations

Diagnosis

• Use CT imaging to classify distal clavicle fractures according to Neer classification, identifying Type IIB fractures by conoid ligament rupture and trapezoid ligament preservation.

Management

• Early surgical intervention is recommended for Neer Type IIB distal clavicle fractures due to poor fracture stability and high risk of delayed union or nonunion.
• Clavicular hook plate fixation is effective but associated with high complication rates including subacromial impingement and acromioclavicular joint osteoarthritis.
• Adjustable strap plate fixation offers comparable biomechanical stability with fewer complications and allows arthroscopic treatment of associated shoulder injuries.

Monitoring & Follow-up

• Monitor for complications such as subacromial impingement, rotator cuff injury, and osteolysis post clavicular hook plate fixation.
• Implants, especially hook plates, should be removed promptly after fracture healing to reduce complication risks.

Risks

• Clavicular hook plates may cause localized high pressure on the subacromial surface leading to impingement and joint osteoarthritis.
• High complication rates (up to 76.6%) reported with clavicular hook plate fixation.
• Adjustable strap plates may reduce these risks but require surgical expertise for arthroscopic application.

Patient & Prescribing Data

Adult patients with Neer Type IIB distal clavicle fractures, typically young healthy individuals requiring surgical fixation.

Both fixation methods maintain internal fixation stresses below material yield strengths, indicating low risk of implant failure; adjustable strap plates may offer improved clinical outcomes by minimizing complications and avoiding secondary surgery.

Clinical Best Practices

• Perform early surgical fixation for Neer Type IIB distal clavicle fractures to prevent delayed union or nonunion.
• Consider adjustable strap plate fixation for patients to reduce risk of subacromial impingement and allow arthroscopic treatment of concomitant injuries.
• If clavicular hook plates are used, plan for timely implant removal after fracture healing to mitigate complications.
• Use finite element analysis data to inform implant selection based on biomechanical stability and stress distribution characteristics.

References

• Neer Classification and Fracture Stability
• Complications of Clavicular Hook Plates
• Arthroscopic Sling Plate Fixation Benefits