Long-term outcomes of the four-corner fusion of the wrist: A systematic review

Table 1 Criteria for study selection

Inclusion criteria	Exclusion criteria
Human studies in English or German language	Oral presentations, cadaveric or review articles, animal studies
Minimum Level IV case series studies using Oxford Centre for Evidence-Based Medicine 2011 Levels of Evidence	Language not in English or German
Four corner fusion surgery using any technique	Minimum follow-up less than 5 yr
A minimum follow-up of 5 yr	Inflammatory arthropathy as etiology
Clinical and radiographic data including patient-reported outcomes, grip/pinch strength, range of motion, fusion rates, revisions or complications have been reported	Insufficient outcome data reported