We prospectively randomised 78 patients into two groups, ‘drains’ or ‘no drains’ to assess the effectiveness of suction drains in reducing haematoma and effusion in the joint and its effect on wound healing after total knee replacement. Ultrasound was used to measure the formation of haematoma and effusion on the fourth post-operative day. This was a semi-quantitative assessment of volume estimation. There was no difference in the mean effusion between the groups (5.91 mm in the drain group versus 6.08 mm in the no-drain, p = 0.82). The mean amount of haematoma in the no-drain group was greater (11.07 mm versus 8.41 mm, p = 0.03). However, this was not clinically significant judged by the lack of difference in the mean reduction in the post-operative haemoglobin between the groups (drain group 3.4 g/dl; no-drain group 3.0 g/dl, p = 0.38). There were no cases of wound infection or problems with wound healing at six weeks in any patient.Our findings indicate that drains do not reduce joint effusion but do reduce haematoma formation. They have no effect on wound healing.
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机译：我们前瞻性地将78例患者随机分为“无引流”或“无引流”两组，以评估抽吸引流在减少关节血肿和积液及其对全膝关节置换术后伤口愈合的影响方面的有效性。术后第四天用超声测量血肿和积液的形成。这是体积估算的半定量评估。各组之间的平均积液没有差异（排液组为5.91 mm，无排液组为6.08 mm，p = 0.82）。无引流组的平均血肿量更大（11.07 mm对8.41 mm，p = 0.03）。但是，根据两组之间术后血红蛋白平均减少的差异（漏尿组3.4 g / dl;无漏水组3.0 g / dl，p = 0.38），判断这没有临床意义。任何患者在6周内都没有伤口感染或伤口愈合的问题。我们的发现表明引流不会减少关节积液，但会减少血肿的形成。它们对伤口愈合没有影响。
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