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Arthrofibrosis following total knee replacement; does therapeutic warfarin make a difference?
N P Walton1, I Jahromi, P J Dobson
1Wakefield Orthopaedic Clinic, 270 Wakefield St., Adelaide, SA 5000, Australia. neil@nwalton22.fsnet.co.uk
The Knee
|March 8, 2005
Summary
Therapeutic warfarin use after total knee replacement (TKR) significantly increases the risk of developing arthrofibrosis compared to low molecular weight heparin. Patients should be informed about this increased risk of stiffness and reduced knee movement post-surgery.
Area of Science:
- Orthopedic Surgery
- Pharmacology
Background:
- Arthrofibrosis is a common complication after total knee replacement (TKR), leading to reduced knee range of motion and patient dissatisfaction.
- Effective anticoagulation strategies are crucial for preventing thromboembolic events post-TKR, but their impact on arthrofibrosis is not fully understood.
Purpose of the Study:
- To investigate the relationship between therapeutic warfarin anticoagulation and the incidence of arthrofibrosis following TKR.
- To compare arthrofibrosis rates in patients receiving therapeutic warfarin versus prophylactic low molecular weight heparin (LMWH).
Main Methods:
- Retrospective study of 874 primary TKRs performed between 1993 and 2002.
- Patients were divided into two groups: therapeutic warfarin (for thrombophilic tendencies or medical necessity) and prophylactic LMWH.
- Arthrofibrosis was defined as knee flexion <80 degrees at 6-8 weeks post-TKR, requiring manipulation under anesthesia (MUA).
Main Results:
- Overall, 9% of TKRs developed arthrofibrosis requiring MUA.
- The warfarinized group had a significantly higher rate of arthrofibrosis (26%) compared to the non-warfarinized group (8%) (P<0.0001).
- Knee flexion improved to at least 95 degrees in 95% of cases after MUA, with 8 cases experiencing residual fixed flexion deformity.
Conclusions:
- Therapeutic warfarin anticoagulation post-TKR is associated with a statistically significant increase in the risk of developing arthrofibrosis.
- Prophylactic LMWH appears to be associated with lower rates of arthrofibrosis compared to therapeutic warfarin.
- Patients undergoing TKR should be counseled regarding the potential increased risk of arthrofibrosis when therapeutic warfarin is indicated.
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