title: Painful locking of the knee due to bucket handle tear of mediopatellar plica.
abstract: A case of swelling and anterior painful knee due to tear of mediopatellar plica is reported. The patient also felt clunk of the patellofemoral joint and knee locking. Under arthroscopic examination, a thick and fibrous plica was found medial to patellar, and a bucket tear along the plica from medial patellar retinaculum to infrapatellar fat pad. Polarized microscopic examination showed collagen fiber fragment and loss of light reflecting property. Neuro-immunohistology suggested up-regulation of synovial plica innervation in the area around the crack. This may be related to the pain. The bucket tear of mediopatellar plica-caused pain and lock of knee are more common than previously reported.
authors: Center for Joint Surgery, South West Hospital, Third Military Medical University, Chongqing 400038, China.
authors: Rui
authors: R
authors: He
authors: Liu
authors: L
authors: Yang
authors: Lin
authors: L
authors: Guo
mesh_terms: D000328:Adult; D001182:Arthroscopy; D006801:Humans; D007718:Knee Injuries / Q000503:physiopathology*; D008297:Male; D010146:Pain / Q000209:etiology*; D057071:Patellofemoral Joint / Q000293:injuries*