Patella infera following patellar tendon contracture after closed trauma

Patella infera is a rare condition caused by pathological shortening of the patellar tendon. The term ＂patella infera＂ was coined by Caton et al＇ in 1982 and the condition can severely affect knee function. Patella infera has been reported as a complication of non-operative treatment for patellar fracture;^2 anterior cruciate ligament reconstruction;