Table 1 Inclusion- and exclusion criteria

At least 16 years old

Present fracture or other joint pathology/bone matrix pathology

Visited the ER within one week after a lateral ankle sprain

A diagnosed OCD after primary inclusion

Agreed with being approached for this study

Medial ankle instability

Reported anterolateral ankle pain after an ankle sprain or ankle distortion

Previous ankle surgery

Filled out the baseline, 3-, or 6 month questionnaire; and the 12 month follow-up

An unreliable radiograph due to the angle in which it is made or low quality

Acute surgical repair or the ATFL/CFL or any other form of surgery within 12 months after the ER visit