Serum prolidase activity and oxidative–antioxidative status in patients with developmental dysplasia of the hip and its relationship with radiographic severity

Abstract

Background: We aimed to investigate serum prolidase activity and to investigate its association with oxidative–antioxidative status in patients with developmental dysplasia of the hip (DDH).

Methods: Oxidative status parameters, including lipid hydroperoxide (LOOH), total oxidant status (TOS), and the oxidative stress index (OSI), and antioxidative status parameters, free sulfhydryl groups (Total –SH), and total antioxidative capacity (TAC), as well as serum prolidase activity were assessed in patients with DDH (n = 93), and in healthy controls (n = 82). The severity of dysplasia was evaluated according to the Tonnis grading system.

Results: Serum prolidase activity and the oxidant parameters (LOOH, TOS, and OSI) were significantly higher and the antioxidant parameters (Total –SH and TAC) were significantly lower in patients with DDH compared to the controls (P < 0.005 for all). Serum prolidase activity was positively correlated with the Tonnis grade of DDH and LOOH, TOS, and OSI levels (P < 0.001 for all), but inversely correlated with total –SH and TAC levels (P < 0.001 for all).

Conclusion: Increased levels of serum prolidase activity, LOOH, TOS, and OSI, and decreased levels of total –SH and TAC, may be associated with DDH, and these parameters may be useful adjunctive tools to assess the severity of DDH.

Keywords:

• Developmental dysplasia of the hip
• Prolidase enzyme activity
• Total free sulfhydryl groups
• Total antioxidant capacity
• Total oxidant status