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Can knee position save blood following total knee replacement?
Shong Meng Ong1, Grahame John Saint Clair Taylor
1University Hospitals of Leicester NHS Trust, Glenfield Hospital, Groby Road, Leicester LE3 9QP, UK. smong81269@aol.com
The Knee
|March 22, 2003
Summary
Elevating the leg 35 degrees with the knee extended after total knee replacement (TKR) surgery reduces total blood loss by 25%. This simple method is recommended over knee flexion to minimize blood loss and avoid potential complications.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Postoperative Care
Background:
- Previous studies indicated knee flexion post-total knee replacement (TKR) reduced wound drainage.
- Concerns existed that reduced drainage might not reflect actual blood loss, potentially due to drain obstruction or leg elevation.
- The need to verify if knee flexion truly reduces total blood loss and to explore alternative methods was identified.
Purpose of the Study:
- To confirm if knee flexion reduces total hemoglobin loss following TKR.
- To determine the impact of leg elevation and drain obstruction on wound drainage.
- To identify the optimal postoperative positioning for minimizing blood loss after TKR.
Main Methods:
- Sixty TKR patients were randomly assigned to three groups: knee extended and level, leg elevated with knee flexed, or leg elevated with knee extended.
- Postoperative assessments included wound drainage, calculated hemoglobin loss, blood transfusion requirements, pain, range of motion, swelling, hospital stay, and complications over 48 hours.
- Statistical analysis was performed to compare outcomes between the three positioning groups.
Main Results:
- Both knee flexion and leg elevation with the knee extended reduced total hemoglobin loss by 25% compared to the control group.
- Leg elevation with the knee extended was identified as a safer alternative, avoiding potential compromise to tissue oxygenation associated with knee flexion.
- No significant differences were noted in pain, swelling, or length of hospital stay between the effective groups.
Conclusions:
- Postoperative leg elevation at 35 degrees with the knee extended is a simple, safe, and effective method to reduce total blood loss by 25% after TKR.
- This positioning strategy is recommended over knee flexion to minimize blood loss and mitigate risks of compromised tissue oxygenation.
- Further research could explore long-term functional outcomes and patient-reported benefits of this recommended positioning.