Table 1.

Exclusion criteria

Exclusion criteria	No. of studies
Non-primary OCDs	91
<5 patients	20
Age: <18 years old	17
Patient overlap	14
Treatment inappropriately described	13
Combination of diagnoses (bipolar, fracture, etc.)	13
Combination of treatment groups and/or no separate data per group	8
Follow-up <6 months	2
Interpretable data not available	2
Asymptomatic lesion	1
Total no. of excluded studies	181

Some publications were excluded due to a combination of reasons