Rotator cuff tear arthropathy was the most common indication for RTSA overall in 5459 patients, followed by pseudoparalysis in 1352 patients (Tables 2 and 3). While studies in North America reported rotator cuff tear arthropathy as the indication for RTSA in 4418 (75.8%) patients, and pseudoparalysis as the next most common indication in 535 (9.2%) patients, studies from Europe reported rotator cuff tear arthropathy as the indication in 895 (33.5%) patients, and pseudoparalysis as the indication in 795 (29.7%) patients. Studies from Asia also had a relatively even split between rotator cuff tear arthropathy and pseudoparalysis (45.3% vs 37.8%), whereas those from Australia were mostly rotator cuff tear arthropathy (77.7%).
Table 2. Number (Percent) of Studies With Each Indication by Continent
North America | Europe | Asia | Australia | Total | P-value | |
Rotator cuff arthropathy | 29 (56%) | 19 (44%) | 3 (75%) | 3 (75%) | 54 (52%) | 0.390 |
Osteoarthritis | 4 (8%) | 10 (23%) | 1 (25%) | 1 (25%) | 16 (16%) | 0.072 |
Rheumatoid arthritis | 9 (17%) | 10 (23%) | 0 (0%) | 2 (50%) | 21 (20%) | 0.278 |
Post-traumatic arthritis | 3 (6%) | 5 (12%) | 0 (0%) | 1 (25%) | 9 (9%) | 0.358 |
Instability | 6 (12%) | 3 (7%) | 0 (0%) | 1 (25%) | 10 (10%) | 0.450 |
Revision of previous RTSA for instability | 5 (10%) | 1 (2%) | 0 (0%) | 1 (25%) | 7 (7%) | 0.192 |
Infection | 4 (8%) | 1 (2%) | 1 (25%) | 0 (0%) | 6 (6%) | 0.207 |
Unclassified acute proximal humerus fracture | 9 (17%) | 5 (12%) | 1 (25%) | 1 (25%) | 16 (16%) | 0.443 |
Acute 2-part proximal humerus fracture | 0 (0%) | 0 (0%) | 0 (0%) | 0 (0%) | 0 (0%) | N/A |
Acute 3-part proximal humerus fracture | 2 (4%) | 0 (0%) | 0 (0%) | 0 (0%) | 2 (2%) | 0.574 |
Acute 4-part proximal humerus fracture | 5 (10%) | 0 (0%) | 0 (0%) | 0 (0%) | 5 (5%) | 0.183 |
Acute 3- or 4-part proximal humerus fracture | 6 (12%) | 2 (5%) | 0 (0%) | 0 (0%) | 8 (8%) | 0.635 |
Revised from previous nonop proximal humerus fracture | 7 (13%) | 3 (7%) | 0 (0%) | 0 (0%) | 10 (10%) | 0.787 |
Revised from ORIF | 1 (2%) | 1 (2%) | 0 (0%) | 0 (0%) | 2 (2%) | 1.000 |
Revised from CRPP | 0 (0%) | 1 (2%) | 0 (0%) | 0 (0%) | 1 (1%) | 0.495 |
Revised from hemi | 8 (15%) | 4 (9%) | 0 (0%) | 1 (25%) | 13 (13%) | 0.528 |
Revised from TSA | 15 (29%) | 11 (26%) | 0 (0%) | 2 (50%) | 28 (27%) | 0.492 |
Osteonecrosis | 4 (8%) | 2 (5%) | 1 (25%) | 0 (0%) | 7 (7%) | 0.401 |
Pseudoparalysis irreparable tear without arthritis | 20 (38%) | 18 (42%) | 2 (50%) | 1 (25%) | 41 (40%) | 0.919 |
Bone tumors | 0 (0%) | 4 (9.3%) | 0 (0%) | 0 (0%) | 4 (4%) | 0.120 |
Locked shoulder dislocation | 0 (0%) | 0 (0%) | 1 (25%) | 0 (0%) | 1 (1%) | 0.078 |
Abbreviations: CRPP, closed reduction and percutaneous pinning; ORIF, open reduction internal fixation; RTSA, reverse total shoulder arthroplasty; TSA, total shoulder arthroplasty.
Table 3. Number of Patients With Each Indication as Reported by Individual Studies by Continent
North America | Europe | Asia | Australia | Total | |
Rotator cuff arthropathy | 4418 | 895 | 24 | 122 | 5459 |
Osteoarthritis | 90 | 251 | 1 | 14 | 356 |
Rheumatoid arthritis | 59 | 87 | 0 | 2 | 148 |
Post-traumatic arthritis | 62 | 136 | 0 | 1 | 199 |
Instability | 23 | 15 | 0 | 1 | 39 |
Revision of previous RTSA for instability | 29 | 2 | 0 | 1 | 32 |
Infection | 28 | 11 | 2 | 0 | 41 |
Unclassified acute proximal humerus fracture | 42 | 30 | 4 | 8 | 84 |
Acute 3-part proximal humerus fracture | 60 | 0 | 0 | 0 | 6 |
Acute 4-part proximal humerus fracture | 42 | 0 | 0 | 0 | 42 |
Acute 3- or 4-part proximal humerus fracture | 92 | 46 | 0 | 0 | 138 |
Revised from previous nonop proximal humerus fracture | 43 | 53 | 0 | 0 | 96 |
Revised from ORIF | 3 | 9 | 0 | 0 | 12 |
Revised from CRPP | 0 | 3 | 0 | 0 | 3 |
Revised from hemi | 105 | 51 | 0 | 1 | 157 |
Revised from TSA | 192 | 246 | 0 | 5 | 443 |
Osteonecrosis | 9 | 6 | 1 | 0 | 16 |
Pseudoparalysis irreparable tear without arthritis | 535 | 795 | 20 | 2 | 1352 |
Bone tumors | 0 | 38 | 0 | 0 | 38 |
Locked shoulder dislocation | 0 | 0 | 1 | 0 | 1 |
Abbreviations: CRPP, closed reduction and percutaneous pinning; ORIF, open reduction internal fixation; RTSA, reverse total shoulder arthroplasty; TSA, total shoulder arthroplasty.
The ASES, SST-12, and VAS scores were the most frequently reported outcome scores in studies from North America, whereas the Absolute Constant score was the most common score reported in studies from Europe (Table 4). Studies from North America reported significantly higher postoperative external rotation (34.1° ± 13.3° vs 19.3° ± 8.9°) (P < .001) and a greater change in flexion (69.0° ± 24.5° vs 56.3° +/- 11.3°) (P = .004) compared with studies from Europe (Table 5).
Table 4. Outcomes by Continent
Metric (number of studies) | North America | Europe | Asia | Australia | P-value |
DASH | 1 | 2 | 0 | 0 | |
Preoperative | 54.0 | 62.0 ± 8.5 | - | - | 0.582 |
Postoperative | 24.0 | 32.0 ± 2.8 | - | - | 0.260 |
Change | -30.0 | -30.0 ± 11.3 | - | - | 1.000 |
SPADI | 2 | 0 | 0 | 0 | |
Preoperative | 80.0 ± 4.2 | - | - | - | N/A |
Postoperative | 34.8 ± 1.1 | - | - | - | N/A |
Change | -45.3 ± 3.2 | - | - | - | N/A |
Absolute constant | 2 | 27 | 0 | 1 | |
Preopeartive | 33.0 ± 0.0 | 28.2 ± 7.1 | - | 20.0 | 0.329 |
Postoperative | 54.5 ± 7.8 | 62.9 ± 9.0 | - | 65.0 | 0.432 |
Change | +21.5 ± 7.8 | +34.7 ± 8.0 | - | +45.0 | 0.044 |
ASES | 13 | 0 | 2 | 0 | |
Preoperative | 33.2 ± 5.4 | - | 32.5 ± 3.5 | - | 0.867 |
Postoperative | 73.9 ± 6.8 | - | 75.7 ± 10.8 | - | 0.752 |
Change | +40.7 ± 6.5 | - | +43.2 ± 14.4 | - | 0.670 |
UCLA | 3 | 2 | 1 | 0 | |
Preoperative | 10.1 ± 3.4 | 11.2 ± 5.7 | 12.0 | - | 0.925 |
Postoperative | 24.5 ± 3.1 | 24.3 ± 3.7 | 24.0 | - | 0.991 |
Change | +14.4 ± 1.6 | +13.1 ± 2.0 | +12.0 | - | 0.524 |
KSS | 0 | 0 | 2 | 0 | |
Preopeartive | - | - | 38.2 ± 1.1 | - | N/A |
Postoperative | - | - | 72.3 ± 6.0 | - | N/A |
Change | - | - | +34.1 ± 7.1 | - | N/A |
SST-12 | 12 | 1 | 0 | 0 | |
Preoperative | 1.9 ± 0.8 | 1.2 | - | - | N/A |
Postoperative | 7.1 ± 1.5 | 5.6 | - | - | N/A |
Change | +5.3 ± 1.2 | +4.4 | - | - | N/A |
SF-12 | 1 | 0 | 0 | 0 | |
Preoperative | 34.5 | - | - | - | N/A |
Postoperative | 38.5 | - | - | - | N/A |
Change | +4.0 | - | - | - | N/A |
SSV | 0 | 5 | 0 | 0 | |
Preopeartive | - | 22.0 ± 7.4 | - | - | N/A |
Postoperative | - | 63.4 ± 7.9 | - | - | N/A |
Change | - | +41.4 ± 2.1 | - | - | N/A |
EQ-5D | 0 | 2 | 0 | 0 | |
Preoperative | - | 0.5 ± 0.2 | - | - | N/A |
Postoperative | - | 0.8 ± 0.1 | - | - | N/A |
Change | - | +0.3 ± 0.1 | - | - | N/A |
OOS | 1 | 0 | 0 | 0 | |
Preoperative | 24.7 | - | - | - | N/A |
Postoperative | 14.9 | - | - | - | N/A |
Change | -9.9 | - | - | - | N/A |
Rowe | 0 | 1 | 0 | 0 | |
Preoperative | - | 50.2 | - | - | N/A |
Postoperative | - | 82.1 | - | - | N/A |
Change | - | 31.9 | - | - | N/A |
Oxford | 0 | 2 | 0 | 0 | |
Preoperative | - | 119.9 ± 138.8 | - | - | N/A |
Postoperative | - | 39.9 ± 3.3 | - | - | N/A |
Change | - | -80.6 ± 142.2 | - | - | N/A |
Penn | 1 | 0 | 0 | 0 | |
Preoperative | 24.9 | - | - | - | N/A |
Postoperative | 66.4 | - | - | - | N/A |
Change | +41.5 | - | - | - | N/A |
VAS | 10 | 1 | 1 | 1 | |
Preoperative | 6.6 ± 0.8 | 7.0 | 8.4 | 7.0 | N/A |
Postoperative | 2.0 ± 0.7 | 1.0 | 0.8 | 0.8 | N/A |
Change | -4.6 ± 0.8 | -6.0 | -7.6 | -6.2 | N/A |
SF-36 physical | 2 | 0 | 0 | 0 | |
Preoperative | 32.7 ± 1.2 | - | - | - | N/A |
Postoperative | 39.6 ± 4.0 | - | - | - | N/A |
Change | +7.0 ± 2.8 | - | - | - | N/A |
SF-36 mental | 2 | 0 | 0 | 0 | |
Preoperative | 43.6 ± 2.8 | - | - | - | N/A |
Postoperative | 48.1 ± 1.0 | - | - | - | N/A |
Change | +4.5 ± 1.8 | - | - | - | N/A |
Abbreviations: ASES, American Shoulder and Elbow Surgeon score; DASH, Disability of the Arm, Shoulder, and Hand; EQ-5D, EuroQol-5 Dimension; KSS, Korean Shoulder Scoring system; N/A, not available; OOS, Orthopaedic Outcome Score; SF, short form; SPADI, Shoulder Pain and Disability Index; SST, Simple Shoulder Test; SSV, Subjective Shoulder Value; UCLA, University of California, Los Angeles; VAS, visual analog scale.
Table 5. Shoulder Range of Motion, by Continent
Metric (number of studies) | North America | Europe | Asia | Australia | P-value |
Flexion | 18 | 22 | 1 | 1 | |
Preoperative | 57.6 ± 17.9 | 65.5 ± 17.2 | 91.0 | 30.0 | 0.060 |
Postoperative | 126.6 ± 14.4 | 121.8 ± 19.0 | 133.0 | 150.0 | 0.360 |
Change | +69.0 ± 24.5 | +56.3 ± 11.3 | +42.0 | 120.0 | 0.004 |
Abduction | 11 | 12 | 1 | 0 | |
Preoperative | 53.7 ± 25.0 | 52.0 ± 19.0 | 88.0 | - | 0.311 |
Postoperative | 109.3 ± 15.1 | 105.4 ± 19.8 | 131.0 | - | 0.386 |
Change | 55.5 ± 25.5 | 53.3 ± 8.3 | 43.0 | - | 0.804 |
External rotation | 17 | 19 | 0 | 0 | |
Preoperative | 19.4 ± 9.9 | 11.2 ± 6.1 | - | - | 0.005 |
Postoperative | 34.1 ± 13.3 | 19.3 ± 8.9 | - | - | <0.001 |
Change | +14.7 ± 13.2 | +8.1 ± 8.5 | - | - | 0.079 |
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