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