Suction Drains in Joint Replacement Surgery Leads to Higher Blood Loss, Study Finds

Total Knee Arthroplasty (TKA) is a premier orthopedic intervention for managing end-stage osteoarthritis, yet surgeons continue to debate whether postoperative intra-articular suction drainage effectively reduces complications like hematoma formation and infection. Alessandro Smimmo and colleagues from the Università Cattolica del Sacro Cuore initiated this multicentric trial to bridge the clinical gap between perceived benefits—such as reduced swelling—and the documented risks of increased systemic blood loss, aiming to provide objective evidence through advanced imaging and clinical metrics.

Therefore, the prospective trial followed 60 patients undergoing primary TKA at two Italian surgical centers, randomly assigning 30 participants to a drainage group and 30 to a no-drainage control group to evaluate recovery over the first five postoperative days. The research team excluded individuals with rheumatoid arthritis, coagulation disorders, or complex revision needs, focusing on primary endpoints including hemoglobin fluctuations and Visual Analog Scale (VAS) pain scores, alongside secondary ultrasound assessments of intra-articular hematoma volume.

Key Clinical Findings of the Study Includes:

• Increased Hemorrhagic Risk: The study verified a substantially greater drop in hemoglobin and a higher mean estimated blood loss (EBL) in patients who received suction drainage.

• Higher Transfusion Rates: Trial data showed that 13.3% of the drainage cohort required blood transfusions, whereas zero patients in the no-drainage group required such interventions.

• Transient Pain Reduction: While drainage achieved lower VAS scores on the first postoperative day (4.97 vs. 6.3), this analgesic benefit completely disappeared by day three.

• Limited Hematoma Control: Ultrasound confirmed that although drains limited early hematoma size to 14.6 mm initially, no significant difference was found compared to the non-drainage group by the fifth day after drain removal.

• Wound Complication Trends: Patients with active drainage exhibited a higher incidence of minor issues, including moderate swelling and mild surgical wound bleeding, compared to the no-drainage cohort.

The results suggest that while intra-articular drainage may offer a very brief window of decompression and pain relief immediately following surgery, these advantages are rapidly lost once the drain is removed and are outweighed by a statistically significant increase in postoperative anemia and transfusion requirements. Specifically, the data indicate that the internal pressure of a small, early hematoma may actually act as a natural hemostatic agent, helping to stabilize hemoglobin levels more effectively than active suction.

Thus, the study concludes that orthopedic surgeons are encouraged to reconsider the routine application of suction drains in primary knee procedures, opting instead for a selective approach that prioritizes systemic blood preservation and individualized patient risk factors.

While the study’s findings are compelling, the brief five-day follow-up and the operator-dependent nature of ultrasound assessments suggest a need for future longitudinal research to explore how personalized drainage strategies might impact long-term joint stiffness and functional recovery.

Reference

Smimmo, A., Basilico, M., Bonfiglio, N., Ruberto, P., Vitiello, R., Bocchino, G., Carosini, A., Tanzi Germani, G., Salvini, M., Di Gialleonardo, E., Malerba, G., & De Santis, V. (2025). Clinic and Ultrasound Evaluation of Suction Drainage in Total Knee Arthroplasty Procedure: A Multicentric Prospective Trial. Indian Journal of Orthopaedics, 59, 1840–1848.