# The Fate of Borderline Pathology in Dimensional Classification Systems: A Narrative Review

## TL;DR

The paper reviews how borderline personality disorder fits into modern diagnostic systems, showing it reflects overall severity rather than a unique disorder.

## Contribution

It clarifies that borderline pathology is best understood as a dimension of personality dysfunction rather than a distinct entity.

## Key findings

- Borderline symptoms consistently load on a general personality disorder factor, not as a distinct category.
- The borderline level of functioning aligns with severity measures in DSM-5 and ICD-11.
- Retaining borderline pathology as a dimensional marker supports continuity in clinical practice and research.

## Abstract

What are the main findings?
•Borderline symptoms do not form a distinct factor in structural analyses but consistently load on a general personality disorder factor, functioning as markers of overall severity of personality dysfunction rather than defining a separate diagnostic entity.•The concept of the borderline level of personality functioning converges with the Level of Personality Functioning (Criterion A) in DSM-5 AMPD and the severity continuum in ICD-11, demonstrating that borderline pathology represents a dimension of structural vulnerability across personality disorders.

Borderline symptoms do not form a distinct factor in structural analyses but consistently load on a general personality disorder factor, functioning as markers of overall severity of personality dysfunction rather than defining a separate diagnostic entity.

The concept of the borderline level of personality functioning converges with the Level of Personality Functioning (Criterion A) in DSM-5 AMPD and the severity continuum in ICD-11, demonstrating that borderline pathology represents a dimension of structural vulnerability across personality disorders.

What are the implications of the main findings?
•Retaining borderline pathology as a recognizable clinical pattern within dimensional classification systems preserves continuity with established treatment and research traditions while providing clinicians with a meaningful marker of moderate-to-severe personality dysfunction.•Dimensional assessment of personality disorders should integrate both severity rating and trait-based description, with borderline features serving as clinically useful indicators of regression proneness and the need for specialized psychotherapeutic intervention.

Retaining borderline pathology as a recognizable clinical pattern within dimensional classification systems preserves continuity with established treatment and research traditions while providing clinicians with a meaningful marker of moderate-to-severe personality dysfunction.

Dimensional assessment of personality disorders should integrate both severity rating and trait-based description, with borderline features serving as clinically useful indicators of regression proneness and the need for specialized psychotherapeutic intervention.

Recent revisions of personality disorder (PD) classifications have moved from categorical diagnoses toward dimensional models, raising renewed questions about the nosological status and clinical utility of borderline personality disorder (BPD). This narrative review traces the development of the borderline construct from early descriptions of patients positioned between neurosis and psychosis, through its theoretical consolidation within the concept of borderline personality organization, to the operationalization of BPD in DSM-III and subsequent diagnostic revisions. A central section summarizes contemporary controversies regarding the validity and utility of BPD features. Arguments for abandoning the diagnosis emphasize the absence of a distinct borderline factor in factor analytic studies, the tendency of the construct to capture fluctuating symptoms and patterns of behaviour rather than stable maladaptive personality traits, the stigmatizing and non-selective use of the label, and the lack of disorder-specific treatment approaches. In contrast, converging evidence supports the view that core borderline symptoms frequently function as markers of general PD pathology and of the severity of impairments in self and interpersonal functioning. The paper integrates the concept of the borderline level of personality functioning, conceptualizing borderline pathology as a dynamic dimension of dysfunction with potential transient regressions, and links this concept to the Level of Personality Functioning (LPF, Criterion A) within the DSM 5 Alternative Model for Personality Disorders (AMPD). Retaining borderline pathology as a dimension may support contemporary PD assessment by offering a clinically recognizable marker of overall dysfunction, a guide for rating severity, an indicator of personality structure and need for psychotherapy, without disrupting continuity with an extensive clinical and research tradition.