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Related Experiment Videos

Symptomatic venous thromboembolism after total knee replacement

D J Warwick1, S Whitehouse

  • 1University of Bristol and the Bristol Knee Group, England, UK.

The Journal of Bone and Joint Surgery. British Volume
|October 23, 1997
PubMed
Summary

Chemical prophylaxis does not reduce symptomatic venous thromboembolism (VTE) after total knee replacement (TKR). TKR itself is the main risk factor for VTE, and prophylaxis increased side effects. New methods are needed.

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Area of Science:

  • Orthopedic Surgery
  • Vascular Surgery
  • Pharmacology

Background:

  • Chemical prophylaxis is established to decrease venographic deep-vein thrombosis (DVT) post-total knee replacement (TKR).
  • The impact of prophylaxis on symptomatic VTE incidence remains uncertain, necessitating epidemiological analysis.

Purpose of the Study:

  • To investigate the pattern of symptomatic thromboembolic events following primary TKR.
  • To identify risk factors and evaluate the efficacy of chemical prophylaxis in preventing symptomatic VTE.

Main Methods:

  • Retrospective review of 1000 primary TKR patients' clinical records.
  • Individual patient contact to gather data on risk factors, prophylaxis, symptomatic VTE/PE, complications, and mortality.
  • Radiological confirmation of thromboembolic events.

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Main Results:

  • Symptomatic VTE occurred in 10.6% of patients, with TKR itself being the primary risk factor.
  • Chemical prophylaxis (33.9% of patients) did not significantly reduce symptomatic VTE incidence compared to no prophylaxis (10.1% vs 10.5%).
  • Patients with risk factors had higher VTE rates (15.1%) and earlier symptom onset (median day 5). Chemical prophylaxis showed no benefit in reducing VTE in either risk group.
  • Haematoma or wound dehiscence was more frequent with chemical prophylaxis (11.9% vs 6.9%).

Conclusions:

  • Chemical prophylaxis is ineffective in reducing symptomatic VTE after TKR and is associated with increased side effects.
  • Risk factors, beyond TKR itself, do not appear to be significantly modified by current chemical prophylaxis strategies.
  • Novel prophylactic methods or combinations, rigorously evaluated in randomized controlled trials, are required to improve outcomes.