Simultaneous Bilateral Avulsion of Tibial Anterior Tubercle in Adolescent: Two Case Reports and Narrative Review of the Literature

Table 1

Anterior tibial tubercle fracture avulsion.

Type I	Small fragment of the tubercle is avulsed and displaced proximally
	Subtype A: undisplaced
	Subtype B: displaced or comminuted
Type II	The secondary ossification center has already fused with the proximal tibia epiphysis, and the entire tubercle is displaced proximally
	Subtype A: undisplaced
	Subtype B: displaced or comminuted
Type III	Fracture passing across the proximal physis into the joint, involving part of it
	Subtype A: undisplaced
	Subtype B: displaced or comminuted
Type IV	Fracture passing entirely through the proximal physis without involving the joint
	Subtype A: undisplaced
	Subtype B: displaced or comminuted
Type V	Type III with fracture involving the remaining part of the physis, usually the posterior part
	Subtype A: undisplaced
	Subtype B: displaced or comminuted

Note. Watson-Jones classification modified by Ogden, Ryu, and Mckoy. (1) Type I. (2) Type II. (3) Type III with intra-articular extension. (4) Type IV with entire proximal tibial physeal separation. (5) Type V resembling a combination of types IIIb and Salter Harris type IV.