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Table 1 Baseline patient and shoulder characteristics according to the defined prosthesis groups

From: Analysis of three different reverse shoulder arthroplasty designs for cuff tear arthropathy – the combination of lateralization and distalization provides best mobility

 

Group 1

Group 2

Group 3

StdDiff

n(%a)

mean (SD)

n(%a)

mean (SD)

n(%a)

mean (SD)

1vs.3/ 1vs.2 / 2vs.3

Age at surgery

 

74.4 (7.7)

 

75.5 (5.7)

 

75.7 (6.2)

0.189 / 0.165 / 0.033

Sex

      

0.847 / 0.055 / 0.789

 Female

33(66)

 

136(96)

 

24(69)

  

 Male

17(34)

 

5(4)

 

11(31)

  

Diagnosis

      

0.563 / 0.117 / 0.148

 RC tear without arthrosis

9(18)

 

27(19)

 

11(31)

  

 RC tear with arthrosis

41(82)

 

114(81)

 

24(69)

  

Radiological examination

      

0.281 / 0.630 / 0.452

 None

3(9)

 

8(8)

    

 Magnetic resonance imaging

20(63)

 

86(83)

 

23(100)

  

 Ultrasound

9(28)

 

9(9)

    

RC tear type according to Lädermannb

      

0.205 / 0.396 / 0.446

 A

3(10)

 

17(18)

 

4(17)

  

 B

1(3)

 

3(3)

 

2(9)

  

 C

18(60)

 

50(53)

 

14(61)

  

 D

8(27)

 

23(24)

 

3(13)

  

 E

  

1(1)

    

Supraspinatus

      

0.099 / 0.820 / 1.064

 Intact tendon

1(3)

      

 Partial tear

1(3)

 

16(17)

    

 Complete tear

27(93)

 

80(83)

 

23(100)

  

Infraspinatus

      

0.108 / 0.306 / 0.311

 Intact tendon

7(24)

 

23(24)

 

2(8)

  

 Partial tear

10(34)

 

32(33)

 

9(39)

  

 Complete tear

12(41)

 

41(43)

 

12(52)

  

Subscapularis

      

0.211 / 0.432 / 0.379

 Intact tendon

9(31)

 

28(29)

 

8(34)

  

 Partial tear

16(55)

 

54(56)

 

11(48)

  

 Complete tear

4(14)

 

14(15)

 

4(17)

  

Teres minor

      

0.179 / 0.219 / 0.151

 Intact

28(97)

 

88(92)

 

19(83)

  

 Partial tear

  

6(6)

 

3(12)

  

 n.d

1(3)

 

2(2)

 

2(8)

  

Glenoid wear according to Favardc

      

0.688 / 0.205 / 0.151

 E0

21(44)

 

29(22)

 

15(42)

  

 E1

4(8)

 

29(22)

 

7(19)

  

 E2

7(16)

 

13(10)

 

1(4)

  

 E3

4(8)

 

6(4)

 

10(30)

  

 n.d

11(24)

 

56(42)

 

2(7)

  

RC tear arthropathy according to Hamadad

      

0.544 / 0.861 / 1.054

 Grade 1

13(28)

 

72(54)

 

7(19)

  

 Grade 2

9(19)

 

17(13)

 

7(19)

  

 Grade 3

6(13)

 

7(5)

 

5(15)

  

 Grade 4A

4(9)

 

11(8)

 

2(6)

  

 Grade 4B

9(19)

 

18(14)

 

5(15)

  

 Grade 5

  

4(3)

 

7(20)

  

 n.d

  

4(3)

 

2 (6)

  
  1. SD standard deviation, StdDiff standardized difference calculated to three decimal places and equal to the absolute difference between group means divided by the common standard deviation, where values closest to 0.10 or below indicate stronger group similarity. The three values show the standardized difference between groups 155 and 135, groups 155 and 145, and groups 145 and 135, respectively; RC = rotator cuff; n.d. = indeterminable
  2. aThe percentage refers to the number of patients missing excluded
  3. bLädermann A, Denard PJ, Collin P. Massive rotator cuff tears: definition and treatment. Int. Orthop. 2015;39(12):2404–2414. https://doi.org/10.1007/s00264-015-2796-5: A = supraspinatus and superior subscapularis tears, B = supraspinatus and entire subscapularis tears, C = infraspinatus, supraspinatus and superior subscapularis tears, D = supraspinatus and infraspinatus tears, E = supraspinatus, infraspinatus and teres minor tears
  4. cFavard L, Lautmann S, Sirveaux F, Oudet D, Kerjean Y, Huguet D. Hemiarthroplasty versus reverse arthroplasty in the treatment of osteoarthritis with massive rotator cuff tear. In: Walch G, Boileau P, Molé D, editors. 2000 Shoulder Prostheses. Two to ten years follow-up. Sauramps Medical: Paris, France; 2001. p 261–268: E0 = superior humeral head migration without erosion of the glenoid, E1 = concentric erosion of the glenoid, E2 = if erosion was limited to the superior part of the glenoid, E3 = if erosion extended to the inferior part of the glenoid
  5. dHamada K, Fukuda H, Mikasa M, Kobayashi Y. Roentgenographic findings in massive rotator cuff tears. A long-term observation. Clin Orthop Relat Res. 1990 May(254):92–96: 1 = acromiohumeral interval > 6 mm; normal glenohumeral joint, 2 = acromiohumeral interval < 5 mm; normal glenohumeral joint, 3 = acromiohumeral interval < 5 mm, with acetabulization of acromion; normal glenohumeral joint, 4A = glenohumeral osteoarthritis without acetabulization, acromiohumeral interval < 7 mm, 4B = glenohumeral osteoarthritis with acetabulization, acromiohumeral interval < 7 mm, 5 = humeral head subchondral collapse characteristic of cuff tear arthropathy
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BMC Musculoskeletal Disorders

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