Table 4 Differences in imaging results for shoulder joint between the two groups before surgery and at 1-year follow-up^a.

AHD, mm

Preop

6.70 ± 1.61

6.99 ± 2.19

Postop

8.41 ± 1.81

8.72 ± 1.59

Δ_{postop – preop}

1.71 ± 1.53

1.73 ± 2.04

P

0.000

0.000

Sugaya classification

Preop

4 [4, 5]

4 [4, 5]

Postop

2 [1, 3]

2 [1, 2]

Δ_{postop – preop}

−3 [−3, −1.25]

−3 [−3, −2]

P

0.000

0.000

Goutallier classification

Preop

2 [2, 3]

2 [2, 3]

Postop

3 [2, 3.75]

2 [1, 2]

Δ_{postop – preop}

0.25 ± 1.13

−1 [−2, 0]

P

0.388

0.000