Table 5 Subgroup analysis
From: Effect of preoperative segmental range of motion on patient outcomes in cervical disc arthroplasty
Small-ROM | P | Large-ROM | P | |||
|---|---|---|---|---|---|---|
+△ROM | -△ROM | +△ROM | -△ROM | |||
No. of arthroplasty levels | 52 | 14 | – | 10 | 56 | – |
HO formation (%)a | 28 (53.8%) | 12 (85.7%) | 0.035 | 3 (30%) | 25 (44.6%) | 0.498 |
HO classification (%)a | < 0.001 | 0.338 | ||||
Low-grade | 46 (88.5%) | 3 (21.4%) | 10 (100%) | 46 (82.1%) | ||
High-grade | 6 (11.5) | 11 (78.6%) | 0 | 10 (17.9%) | ||