Figure 5. Diagnostic effectiveness evaluation and nomogram construction based on the ERRGs related biomarkers. (A–D) The expression profile analysis of HSPA5, UBL4A, ATF4 and PPP1R15A in HC and OA groups. (E) Nomogram construction based on the four ERRGs related biomarkers. (F) Diagnostic effectiveness evaluation of HSPA5, UBL4A, ATF4, PPP1R15A and nomogram score.