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.
| Articulations |
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| Landmarks |
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| Ossification | Ossifies from a secondary centre (sometimes several) appearing at about 8-12 years as a distal tongue of the proximal tibial epiphysis; it fuses with the shaft at about 15-18 years. |
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.
Follow the patellar tendon from the lower point of the kneecap down about 2-3 cm to where it ends on a prominent bony bump at the front of the upper tibia; this is the tibial tuberosity. It is enlarged and tender in 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.
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.
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