Is metaphyseal ulnar shortening osteotomy superior to diaphyseal ulnar shortening osteotomy in the treatment of ulnar impaction syndrome? A meta-analysis

Table 4 General demographic characteristics

Ref.	Preoperative ulnar variance (mm)	Pain score (VAS)	Grip strength of the unaffected side (%)	Selected outcomes
Bernstein et al[4], 2004	1.5	Not reported	55.2	Ulnar variance; VAS; grip strength; complication rate; secondary procedure rate
Marquez-Lara et al[12], 2017	3.9	6.5	Not reported	Secondary procedure rate; complication rate; quick DASH score
Sennwald et al[10], 2013	2.6	8	Not reported	Ulnar variance; VAS
Constantine et al[41], 2000	2	Not reported	Not reported	Secondary procedure rate; complication rate
Smet et al[11], 2014	2	Not reported	Not reported	Secondary procedure rate; complication rate; quick DASH score
Oh et al[9], 2018	2.9	5.9	54.1	Secondary procedure rate; complication rate; quick DASH score

VAS: Visual analog scale.