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The prevalence of cognitive dysfunction after conventional and computer-assisted total knee replacement
1Department of Trauma & Orthopaedics, The Queen Elizabeth Hospital, 28 Woodville Road, Adelaide, SA5011, South Australia, Australia. hershdeo@nhs.net
The Knee
|July 10, 2010
Summary
Post-operative cognitive dysfunction (POCD) affects about one-third of knee replacement patients at six months. Procedure time, not computer-assisted surgery, may contribute to POCD, highlighting the need for further research.
Area of Science:
- Orthopedic Surgery
- Neuroscience
- Cognitive Science
Background:
- Post-operative cognitive dysfunction (POCD) is a recognized complication after lower limb arthroplasty.
- Prevalence estimates for POCD vary widely due to inconsistent diagnostic criteria.
- Understanding POCD prevalence and contributing factors is crucial for patient outcomes.
Purpose of the Study:
- To accurately determine the prevalence of POCD in patients undergoing total knee replacement (TKR).
- To compare POCD rates between conventional TKR and computer-assisted TKR.
- To identify potential factors influencing POCD development after TKR.
Main Methods:
- A prospective study involving 61 patients undergoing TKR (31 conventional, 30 computer-assisted).
- Cognitive function was assessed using 11 validated neuropsychological tests pre-operatively, at 6 days, and 6 months post-operatively.
- Statistical analysis was performed to compare POCD prevalence and identify influencing factors between surgical groups.
Main Results:
- The overall prevalence of POCD was 72% at 6 days and 30% at 6 months post-operatively.
- No significant difference in POCD prevalence was observed between conventional TKR and computer-assisted TKR groups at either time point.
- Longer procedure time, specifically in the computer-assisted TKR group, correlated with higher POCD rates at 6 days but not at 6 months.
Conclusions:
- POCD is prevalent at 6 months (approximately one-third) following TKR, irrespective of surgical technique (conventional vs. computer-assisted).
- Procedure time may be a contributing factor to POCD, particularly in the early post-operative period.
- Further research is recommended to explore other potential factors, such as tourniquet use, in TKR-associated POCD.