Table 1 The diagnostic criteria of ELPS

From: Outcome and experience of arthroscopic lateral retinacular release combined with lateral patelloplasty in the management of excessive lateral pressure syndrome

Diagnostic criteria
① All patients reported persistent pain and crepitus of anterior knee when going up and down stairs and squatting.
② The patellar medial shift [11] was less than 5 mm.
③ The anterior knee pain was induced by 30 degrees of knee flexion.
④ Patellar peripheral finger tenderness was touched on the surface of LR.
⑤ X-ray patella axial images showed obviously tilted outward patella, which was characterized by Wiberg type III or IV patellar [12].
⑥ The knee flexion 20 degree CT examination showed abnormalities of PTA and LPFA [13, 14].