Pain characteristics in patients with hip osteoarthritis

Purpose

Exacerbations of osteoarthritis (OA) pain significantly impair activities of daily living and walking, thereby reducing quality of life. Despite various treatments, persistent pain remains a challenge, particularly in patients with hip OA, where pain perception mechanisms extend beyond nociceptive pain. This study examined the pain characteristics in patients with hip OA, with an emphasis on neuropathic pain and central sensitization (CS).

Methods

A total of 421 patients scheduled for unilateral total hip arthroplasty were analyzed using the painDETECT score and Central Sensitization Inventory to classify the pain types as nociceptive (Noc), CS, neuropathic (Neu), or neuropathic with CS (NeuCS).

Results

The results indicated that 72.9% of patients experienced Noc pain, while 5.0% experienced combined NeuCS pain. The Neu and NeuCS groups exhibited significantly lower modified Harris Hip Score and EuroQol-5 Dimensions Questionnaire (EQ-5D) scores than the Noc group, indicating worse clinical outcomes and quality of life. Neu pain was more intense at rest, and when combined with CS it significantly diminished the quality of life.

Conclusion

These findings highlight the need for mechanism-based pain treatment strategies, such as Neu pain and CS components, which independently and cumulatively affect clinical scores and quality of life. This study highlights the importance of early recognition and targeted treatment of these pain mechanisms in patients with hip OA. Future research should focus on evaluating therapeutic interventions for Neu pain and CS to optimize patient outcomes.