Tibial Tuberosity

tuberositas tibiae

The tibial tuberosity is a prominent oval elevation on the anterior surface of the proximal tibia, approximately 2-3 cm below the inferior pole of the patella. It is the insertion site of the patellar tendon and represents the culmination of the extensor mechanism of the knee. The tuberosity develops from a secondary ossification centre that fuses with the tibial epiphysis in late adolescence.

Region: Knee

Clinical Relevance

Clinical Notes

The tibial tuberosity is the site of Osgood-Schlatter disease in adolescent athletes, where traction apophysitis from repetitive quadriceps loading across the open growth plate produces pain, swelling, and a characteristic bony prominence. In adults, tibial tubercle osteotomy (TTT or TTO) is used in patellofemoral surgery to anteriorise or medialise the patellar tendon insertion, altering the Q-angle and TT-TG distance. It is also the distal fixation point in patellar tendon repair.

Pathology

Common Injuries & Conditions

Osgood-Schlatter Disease

Traction apophysitis at the tibial tuberosity growth plate from repetitive patellar tendon loading in rapidly growing adolescents, producing anterior knee pain, localised swelling, and a visible bony prominence that typically resolves with skeletal maturity.

Tibial Tuberosity Avulsion Fracture

Violent quadriceps contraction in adolescents with a still-open tibial apophysis can avulse the tuberosity, producing acute anterior knee swelling, inability to extend the knee, and a palpable gap at the tendon insertion requiring surgical fixation.