SCF ENCYCLOPEDIA ENTRY

PUBIC SYMPHYSIS DIASTASIS (POSTPARTUM)

SCF-RDOS Registry Code: SCF-RDOS-PPD-MSK-003

Disease Type Classification: Postpartum Musculoskeletal Disorder → Pelvic Ring Instability Syndrome → Pubic Symphysis Diastasis (PSD)

SCF Classification Status: Maternal Pelvic Structural Separation Syndrome

SCF Severity Classification: Pelvic Structural Integrity Failure Disorder

Adaptive Module Activation

• Universal Core Module
• Musculoskeletal Biology Expansion
• Pelvic Biomechanics Expansion
• Connective Tissue Biology Expansion
• Orthopedic Trauma Expansion
• Rehabilitation Biology Expansion
• Neurobiology Expansion
• Pain Biology Expansion
• Maternal Mobility Expansion
• Multi-System Functional Recovery Expansion
• SCF Pathophysiology Protocol (Extended Version)

1. SCOPE & POSITIONING

Definition

Pubic Symphysis Diastasis (PSD) is a postpartum structural pelvic injury characterized by abnormal widening and separation of the pubic symphysis resulting in disruption of pelvic ring stability, impaired force transmission, pain, and functional mobility limitation.

Although mild physiologic widening occurs during pregnancy and childbirth, PSD represents pathologic separation beyond normal adaptive remodeling.

Within the SCF framework, PSD is classified as:

A pelvic-ring structural integrity failure syndrome characterized by excessive separation of the pubic symphysis resulting in biomechanical destabilization, connective tissue disruption, neuromuscular compensation, pain amplification, and maternal mobility dysfunction.

2. CLINICAL POSITIONING

SCF Hierarchical Placement

Normal Pelvic Adaptation

↓

Pregnancy-Induced Ligamentous Relaxation

↓

Excessive Symphyseal Stress

↓

Pubic Symphysis Diastasis

↓

Pelvic Ring Instability

↓

Functional Mobility Impairment

↓

Chronic Pelvic Dysfunction

Relationship to Pelvic Girdle Pain

Pelvic Girdle Pain (PGP)

↓

Biomechanical Instability

↓

Pubic Symphysis Injury

↓

Pubic Symphysis Diastasis

PSD therefore represents one of the most structurally severe forms of postpartum pelvic girdle dysfunction.

3. ETIOPATHOGENIC CORE

Central SCF Principle

PSD develops when childbirth-related biomechanical forces exceed the tensile capacity of the pubic symphysis and associated stabilizing ligamentous structures.

The syndrome reflects failure of:

• Pubic symphyseal integrity
• Pelvic ring stabilization
• Ligamentous resilience
• Force-transfer mechanisms
• Neuromuscular pelvic coordination

Core SCF Equation

Pregnancy Remodeling

Delivery Force Overload

Ligamentous Failure

=

Pubic Symphysis Diastasis

4. ETIOLOGY AND TRIGGER CLUSTERS

Cluster A — Mechanical Delivery Trauma

Associated Factors:

• Prolonged labor
• Obstructed labor
• Shoulder dystocia
• Instrumental delivery

Primary Failure:

Excessive pelvic force transmission

Cluster B — Fetal Size Disproportion

Associated Factors:

• Macrosomia
• Cephalopelvic disproportion

Primary Failure:

Pelvic structural overload

Cluster C — Hormonal Ligamentous Laxity

Associated Factors:

• Relaxin exposure
• Connective tissue hypermobility
• Excessive ligamentous relaxation

Primary Failure:

Reduced pelvic stability reserve

Cluster D — Multiparity

Associated Factors:

• Repeated pelvic remodeling
• Cumulative ligament strain

Primary Failure:

Progressive stabilization loss

Cluster E — Traumatic Pelvic Injury

Associated Factors:

• Falls
• Pelvic trauma
• Obstetric emergencies

Primary Failure:

Direct structural disruption

5. SCF FAULT ARCHITECTURE

Tier I — Pelvic Remodeling Stress

Events:

• Hormonal relaxation
• Connective tissue adaptation

Result:

Reduced stability threshold

Tier II — Symphyseal Overload

Features:

• Excessive tensile stress
• Ligament stretching

Result:

Microstructural injury

Tier III — Ligamentous Failure

Features:

• Fibrocartilage disruption
• Pelvic ring instability

Result:

Pathologic widening

Tier IV — Pubic Symphysis Diastasis

Features:

• Symphyseal separation
• Pain
• Instability

Result:

Clinical PSD

Tier V — Functional Mobility Dysfunction

Features:

• Impaired ambulation
• Transfer difficulty
• Reduced caregiving capacity

Result:

Disability

Tier VI — Chronic Pelvic Structural Dysfunction

Features:

• Persistent instability
• Chronic pain
• Long-term disability

Result:

Chronic pelvic failure syndrome