Postoperative cognitive dysfunction and its relationship to cognitive reserve in elderly total joint replacement...

Area of Science:

• Neuroscience
• Gerontology
• Orthopedic Surgery

Background:

• Postoperative cognitive dysfunction (POCD) after total joint replacement (TJR) is poorly understood due to inconsistent research.
• The moderating role of cognitive reserve in TJR-related POCD has not been previously investigated.

Purpose of the Study:

• To investigate POCD in TJR patients using rigorous methodology.
• To examine the relationship between cognitive reserve and POCD after TJR.

Main Methods:

• Fifty-three older adults undergoing TJR and 45 healthy controls were assessed pre- and post-surgery (6 months).
• Cognition, cognitive reserve, physical, and mental health were measured.
• Standardized regression methods controlled for practice effects in cognitive testing.

Main Results:

• TJR patients exhibited a significant decline in Trail Making Test Part B (TMT B) compared to controls.
• Cognitive reserve predicted TMT B score changes in a subset of TJR patients.
• Patients with greater improvement in TMT B scores had higher cognitive reserve.

Conclusions:

• Rigorous methodology provides limited evidence of POCD after TJR, with practice effects controlled.
• Cognitive reserve's influence on TJR-related cognitive changes was observed in a subset of patients.
• Further research is needed to clarify the role of cognitive reserve in TJR patients with more significant cognitive impairment.