Table 7 The wound complication rates between the two groups in routine primary TKA
|  | Drain use (n = 4540) | No drain (n = 1785) | P value |
|---|---|---|---|
Non-infectious complications, N (%) | |||
 Fat liquefies and wound effusion | 183 (4.03%) | 74 (4.15%) | 0.835% |
 Wound necrosis | 69 (1.52%) | 26 (1.46%) | 0.852% |
 Hematoma | 112 (2.47%) | 48 (2.69%) | 0.613% |
Infectious complications, N (%) | |||
 Superficial wound infection | 59 (1.23%) | 21 (1.18%) | 0.693% |
 PJI within a month postoperatively | 4 (0.09%) | 1 (0.06%) | 1.000% |