Tibial Tubercle Anteromedialization Using the Multi-Directional Tibial Tubercle Transfer System

Area of Science:

• Orthopedic surgery
• Biomechanical engineering
• Patellofemoral joint reconstruction

Background:

• Tibial tubercle osteotomy (TTO) is utilized to realign the patellofemoral joint and decrease contact stress.
• Anteriorization of the tibial tubercle reduces compressive patellofemoral loads.
• Medialization shifts the patellar pull direction, lowering lateral compartment load.

Purpose of the Study:

• To evaluate the Multi-Directional Tibial Tubercle Transfer System (MD3T) for multiplanar correction in TTO.
• To assess the system's ability to achieve precise anteriorization, medialization, or combined anteromedialization of the tibial tubercle.

Main Methods:

• The MD3T system employs a 3-dimensional cutting template to create and transpose compound wedges for multiplanar correction.
• Techniques include isolated anteriorization using a primary wedge, medialization with transposed primary and secondary wedges, and combined anteromedialization.
• Bone defects are managed with autograft and synthetic bone graft substitution.

Main Results:

• Cadaveric biomechanical testing demonstrated no loosening or cracking during simulated walking fatigue and chair rising tests over a 42-day healing period.
• Clinical study results are pending evaluation.

Conclusions:

• The MD3T system, utilizing its wedge technique, enables precise and reproducible multiplanar correction in tibial tubercle osteotomy.
• The system's design facilitates efficient bone defect management during transposition procedures.