Anterior tibial tuberosity distalization osteotomy for painful patella alta

Background: Tibial tubercle osteotomy (TTO) is a standard intervention for objective patellar instability, often performed alongside medial patellofemoral ligament reconstruction or trochleoplasty. However, the use of isolated distalizing TTO for patellofemoral pain syndrome in the absence of instability remains controversial. Patella alta is associated with delayed engagement of the patella into the trochlea, reduced contact area, and increased mechanical stress on the patellofemoral joint during flexion.

Objective: This article aims to define the clinical indications, preoperative diagnostic requirements, and surgical techniques for isolated anterior tibial tubercle (ATT) distalization, while reviewing current literature regarding clinical outcomes and complications.

Key Points: Surgical candidates must present with patella alta (Caton-Deschamps Index >1.2) and pain refractory to six months of conservative management. Preoperative assessment requires lateral radiographs and MRI to evaluate chondral integrity and the sagittal engagement index. The surgical technique involves a 6-cm ATT wedge with a horizontal medial cut and a 45-degree lateral oblique cut to facilitate consolidation. Fixation is achieved using two 4.5-mm cortical screws. Biomechanical data suggest distalization increases patellofemoral congruence but carries risks of iatrogenic patella baja if overcorrected. Meta-analyses indicate a 10% complication rate, including proximal tibia fractures and hardware-related pain, though clinical satisfaction rates reach approximately 80%.

Conclusion: Isolated ATT distalization is an effective procedure for addressing patellofemoral pain related to patella alta. Success depends on precise preoperative planning, meticulous surgical execution to prevent tuberosity avulsion, and strict adherence to postoperative weight-bearing and range-of-motion protocols.