The formal recognition of Borderline Personality Disorder (BPD) began with its inclusion in the DSM-III (APA, 1980), which established clear, observable diagnostic criteria. The subsequent edition, DSM-5 (APA, 2013), reinforced the current categorical definition that requires the presence of five or more specific criteria. Additionally, it introduced an alternative dimensional model that highlights significant impairment in personality functioning—such as in identity and interpersonal relationships—and the presence of distinct pathological traits, including emotional lability.

Previously classified under "Emotionally Unstable Personality Disorder—Borderline type" in the ICD-10. The ICD-11 (International Classification of Diseases, 11th Revision) introduces a significant shift towards a dimensional-categorical model for all personality disorders (WHO, 2019). This framework consists of two key components:

Within the ICD-11 framework, BPD is no longer treated as a distinct categorical diagnosis. Instead, individuals exhibiting the classic symptoms of BPD are diagnosed with a Personality Disorder, typically classified as moderate or severe, qualified by the Borderline Pattern Specifier. This specifier encapsulates the hallmark characteristics of BPD, including emotional instability, impulsiveness, disturbed self-image, and tumultuous relationships (WHO, 2019). This approach emphasises the severity of functional impairment and seeks to mitigate the high levels of diagnostic overlap (comorbidity) prevalent in earlier categorical systems.

Although often viewed as challenging, Borderline Personality Disorder (BPD) is a treatable condition supported by substantial evidence of underlying biological and genetic factors (Leichsenring et al., 2023). Dialectical Behavior Therapy (DBT) is considered the gold standard, particularly for reducing self-harm and helping individuals regulate their emotions (Linehan et al., 2015). Other effective treatments include Mentalisation-Based Therapy (MBT) and Cognitive Behavioral Therapy (CBT) (Bateman & Fonagy, 2016).

In addition, innovative approaches such as ReAttach Therapy, developed by Paula Bartholomeus, are emerging. ReAttach integrates sensory and cognitive techniques to enhance emotional regulation and neural integration, providing a promising avenue toward psychological stability (Bartholomeus, 2018).

Ongoing research is vital, as Borderline Personality Disorder (BPD) affects 1-2% of the global population and is associated with significant rates of self-harm, functional impairment, and comorbid anxiety and depression (Azzam et al., 2024). Key research priorities include:

In conclusion, the ongoing evolution of BPD classification—from DSM-III to ICD-11—highlights the necessity for continuous research to refine our understanding, validate targeted treatments, and ensure patient-centered care.

The client is a 27-year-old unmarried Hindu female, an engineering graduate working in the IT sector. She was born and raised in a middle-class family. Her father, a retired civil engineer, was emotionally distant and highly achievement-oriented, while her mother, a homemaker, was nurturing but emotionally subdued. She is the elder of two siblings, with a younger brother currently in higher education.

The client sought treatment due to emotional instability, a pervasive sense of emptiness, fear of abandonment, and challenges in maintaining relationships. She exhibited intense anger, mood swings, and impulsive behaviors, particularly impacting her romantic relationships. These symptoms amplified after she completed her engineering degree and began a stressful job in the IT field. Additionally, she shared a history of self-harm, although she had not made any suicide attempts.

Childhood: Reported to be academically successful yet emotionally lonely, she often perceived her parents' affection as contingent upon her achievements.

Adolescence: During this period, she began to experience mood swings and heightened sensitivity to perceived rejection from her peers. Notably, instances of self-harm were recorded at age 16, following a disagreement with her mother.

Young adulthood: In college, she formed intense romantic attachments characterised by dependency, jealousy, and fear of abandonment. Breakups triggered severe emotional crises.

Current context: After graduating with a degree in engineering and securing employment, she encountered challenges in the workplace due to interpersonal conflicts, perfectionism, and emotional volatility. Elevated stress levels prompted her to seek therapy following an episode of self-harm and recent absenteeism from work.

Ages 14–16: Initial signs of mood dysregulation and black-and-white thinking emerge.

Ages 17–22: Abandonment fears intensify, leading to unstable relationships and episodes of impulsive behavior.

Ages 23–26: Emotional dysregulation is exacerbated by professional stress, with reported instances of recurrent self-harm.

Age 27 (presentation): There is a persistent sense of emptiness, instability in identity, an increased fear of rejection, and emotional crises that significantly disrupt occupational and social functioning.

DSM-5 Criteria: The client met criteria for Borderline Personality Disorder, including:

To enhance clinical diagnosis, standardised psychometric instruments were administered prior to treatment:

Ethical Considerations: Written informed consent was obtained from the client for participation in therapy and the publication of anonymised case data. Identifying details were removed to maintain confidentiality. The intervention was conducted in accordance with the ethical standards outlined in the Declaration of Helsinki (World Medical Association, 2013).

The therapeutic objectives included:

An eclectic approach was adopted, with ReAttach Therapy serving as the primary modality, supplemented by Dialectical Behavior Therapy (DBT), Cognitive Behavioral Therapy (CBT), and mindfulness practices.

The therapeutic approach highlighted in this case study emphasises the important role of ReAttach Therapy in tackling the primary symptoms of Borderline Personality Disorder (BPD). The method's organised yet adaptable strategy, which merges cognitive and sensory processing, played a crucial role in assisting the client with emotion regulation, restructuring harmful thought patterns, and promoting emotional independence. The joint attention aspect of ReAttach Therapy enhanced the therapist-client relationship, building trust and engagement, which can often be difficult in BPD situations. Additionally, the neuropsychological foundation of ReAttach Therapy, focusing on sensory and cognitive integration, provided a distinctive pathway for emotional regulation, complementing more conventional therapeutic approaches.

The structured phases of ReAttach Therapy were especially effective in addressing the client’s fears of abandonment, emotional instability, and impulsive behavior. The focused cognitive restructuring activities, paired with tactile stimulation, allowed for a reassessment of unhelpful cognitive schemas, resulting in less intense emotional reactions. As therapy progressed, the client demonstrated increased emotional stability and reduced emotional reactivity, indicating that ReAttach Therapy could serve as a beneficial alternative or supplementary intervention to traditional BPD treatments.

While ReAttach Therapy was the primary intervention, its integration with Dialectical Behavior Therapy (DBT), Cognitive Behavioral Therapy (CBT), and mindfulness-based practices established a comprehensive treatment framework. DBT was essential in providing the client with practical tools for managing distress, regulating emotions, and enhancing interpersonal effectiveness. The organised skills training sessions enabled her to cultivate strategies for handling emotional crises, which she successfully utilised in her everyday life.

CBT helped address the client's cognitive distortions, particularly her tendencies toward black-and-white thinking and catastrophic expectations in her relationships. Through systematic cognitive restructuring exercises, the client cultivated a more balanced viewpoint, which improved her ability to navigate social situations and minimised interpersonal conflicts.

Mindfulness-based interventions supported the therapeutic process by increasing the client's capacity to stay present and grounded in emotionally intense moments. Over time, these mindfulness techniques diminished impulsiveness and emotional reactivity, leading to greater self-awareness and psychological resilience.

Future research should explore randomised controlled trials and cross-cultural applications of ReAttach in personality disorders.

In addition to the categorical approach of the DSM-5, the International Classification of Diseases, 11th edition (ICD-11) adopts a dimensional model of personality disorders. This model emphasises impairments in self and interpersonal functioning alongside maladaptive personality traits, moving away from rigid categories toward a spectrum-based conceptualisation (WHO, 2019). Within this framework, borderline patterns are characterised by severe affective instability, abandonment fears, and identity disturbance, aligning with the client’s presentation in this case. Considering ICD-11 dimensionality allows clinicians to capture the client’s personality functioning more comprehensively and highlights the potential role of ReAttach Therapy in addressing cross-cutting domains of dysfunction.

One of the primary challenges encountered during therapy was the client’s resistance to confronting emotionally difficult material, particularly during the initial sessions of ReAttach Therapy. However, by fostering joint attention and building a strong therapeutic alliance, the client gradually became more engaged in the process.

While this case highlights the promise of ReAttach Therapy within an eclectic framework, complementary approaches may also enhance treatment. Techniques such as the Wim Hof method, which integrates controlled breathing, meditation, and cold exposure, have shown preliminary evidence in promoting resilience, emotional regulation, and stress reduction (Muzik & Reiss, 2021). Similarly, edu-psychological access programs that foster moral reasoning, optimism, and social engagement could support broader psychosocial rehabilitation for individuals with BPD. These approaches may be considered as adjunctive strategies in future integrative models of care.