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PubMed This is a summary of 58 peer-reviewed journal articles Updated
Neurology · Autosomal Dominant Pure Hereditary Spastic Paraplegia

Building a Foundation: Understanding Your AD-HSP Diagnosis

At a Glance

Autosomal Dominant Pure Hereditary Spastic Paraplegia (AD-HSP) is a slowly progressive genetic disorder causing muscle stiffness and weakness in the legs. "Pure" HSP focuses on lower-body symptoms, does not cause severe cognitive decline, and typically does not affect normal life expectancy.

Receiving a diagnosis of Autosomal Dominant Pure Hereditary Spastic Paraplegia (AD-HSP) can feel overwhelming, but it marks the end of an often-difficult diagnostic journey. Many patients spend years seeking answers, sometimes being misdiagnosed with conditions like cerebral palsy or other neurodegenerative diseases [1][2]. Understanding the specific nature of your diagnosis can provide a sense of control and clarity.

Defining Your Diagnosis

Autosomal Dominant means that the condition is often passed from one parent to a child, and only one copy of the changed gene is needed to cause the condition [3]. Hereditary Spastic Paraplegia is a group of rare, genetic disorders primarily characterized by spasticity (muscle stiffness and tightness) and weakness in the legs [3][4].

Understanding “Pure” vs. “Complicated”

Doctors divide HSP into two main categories based on symptoms:

  • Pure HSP: Symptoms are mostly limited to the lower body, primarily affecting the corticospinal tracts [5][6]. It does not typically involve other systems of the body [7].
  • Complicated HSP: Includes leg symptoms but is “complicated” by additional neurological issues like ataxia, vision changes, or cognitive impairment [8][9].

Three Stabilizing Facts

  1. It is very slowly progressive. Symptoms typically develop and change over many years or even decades [5][6].
  2. It does not typically affect life expectancy. Most individuals with pure HSP live full, long lives [10][7].
  3. “Pure” means the focus is on your legs. It does not typically cause severe cognitive decline [7][3].

Explore the Guide

Use the links below to navigate through the details of your diagnosis and care plan:

01

Symptoms and Disease Progression of Pure HSP

Learn about pure Hereditary Spastic Paraplegia (HSP) symptoms and progression. Understand motor signs like leg spasticity, gait changes, and urinary urgency.

02

The Biology and Misdiagnosis of HSP

Learn about the biology of Hereditary Spastic Paraplegia (HSP) and why it's often misdiagnosed as CP, MS, or ALS. Understand what happens in the nerve cells.

03

Confirming Your Diagnosis

Learn how Autosomal Dominant Hereditary Spastic Paraplegia (AD-HSP) is diagnosed. Understand genetic testing, SPAST genes, VUS results, and family planning.

04

Standard of Care and Managing Spasticity

Learn about standard of care and spasticity management for AD-HSP. Understand treatment options including physical therapy, medications, Botox, and surgery.

05

Daily Life, Monitoring, and Fall Prevention

Learn how to manage daily life with pure AD-HSP. Discover actionable strategies for fall prevention, symptom monitoring, and conserving energy safely.

Common questions in this guide

What does autosomal dominant mean in AD-HSP?
Autosomal dominant means the condition can be passed from just one parent to a child. Only one copy of the changed gene is needed to cause the disorder.
What is the difference between pure and complicated HSP?
Pure HSP primarily affects the lower body and legs, causing muscle stiffness and weakness. Complicated HSP includes these leg symptoms but is accompanied by other neurological issues like vision changes, ataxia, or cognitive impairment.
Will AD-HSP affect my life expectancy?
No, pure HSP does not typically affect life expectancy. Most individuals diagnosed with pure hereditary spastic paraplegia live full, long lives.
Is pure hereditary spastic paraplegia a fast-moving disease?
No, pure HSP is very slowly progressive. The physical changes, muscle stiffness, and weakness typically develop and evolve gradually over many years or even decades.
Does pure hereditary spastic paraplegia cause cognitive decline?
Pure HSP is focused on the legs and the corticospinal tracts. Unlike complicated forms of the disease, pure HSP does not typically cause severe cognitive decline or affect your memory.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Which specific genetic subtype do I have, and how does that typically affect my outlook?
  2. 2.Based on my current symptoms, do you classify my condition as 'pure' or 'complicated' HSP?
  3. 3.How should we monitor my condition over time to ensure I have the right mobility aids and treatments?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (10)
  1. 1

    Childhood-onset hereditary spastic paraplegia and its treatable mimics.

    Ebrahimi-Fakhari D, Saffari A, Pearl PL

    Molecular genetics and metabolism 2022; (137(4)):436-444 doi:10.1016/j.ymgme.2021.06.006.

    PMID: 34183250
  2. 2

    Spastic paraplegia as the predominant phenotype in a cohort of Chinese patients with adrenoleukodystrophy.

    Luo WJ, Wei Q, Dong HL, et al.

    Molecular genetics & genomic medicine 2020; (8(1)):e1065 doi:10.1002/mgg3.1065.

    PMID: 31777199
  3. 3

    Hereditary Spastic Paraplegia in Alberta: Lessons from a Well-Defined Cohort Including the Indigenous Population.

    Assaedi E, Ashtiani S, Estiar MA, et al.

    Movement disorders clinical practice 2025; (12(9)):1346-1356 doi:10.1002/mdc3.70115.

    PMID: 40322871
  4. 4

    Triple A syndrome presenting as complicated hereditary spastic paraplegia.

    Leveille E, Gonorazky HD, Rioux MF, et al.

    Molecular genetics & genomic medicine 2018; (6(6)):1134-1139 doi:10.1002/mgg3.492.

    PMID: 30381913
  5. 5

    Anaesthesia and orphan disease: Management of a case of Strumpell-Lorrain disease and review of the literature.

    Ponsonnard S, Damon A, Gueye EM

    European journal of anaesthesiology 2017; (34(8)):562-563 doi:10.1097/EJA.0000000000000615.

    PMID: 28682816
  6. 6

    Cognitive dysfunction in hereditary spastic paraplegias and other motor neuron disorders.

    Faber I, Branco LMT, França Júnior MC

    Dementia & neuropsychologia 2016; (10(4)):276-279 doi:10.1590/s1980-5764-2016dn1004004.

    PMID: 29213469
  7. 7

    Hereditary spastic paraplegia caused by compound heterozygous mutations outside the motor domain of the KIF1A gene.

    Krenn M, Zulehner G, Hotzy C, et al.

    European journal of neurology 2017; (24(5)):741-747 doi:10.1111/ene.13279.

    PMID: 28332297
  8. 8

    Genetic and phenotypic characterization of complex hereditary spastic paraplegia.

    Kara E, Tucci A, Manzoni C, et al.

    Brain : a journal of neurology 2016; (139(Pt 7)):1904-18 doi:10.1093/brain/aww111.

    PMID: 27217339
  9. 9

    A novel homozygous HPDL variant in Japanese siblings with autosomal recessive hereditary spastic paraplegia: case report and literature review.

    Kojima F, Okamoto Y, Ando M, et al.

    Neurogenetics 2024; (25(2)):149-156 doi:10.1007/s10048-024-00746-y.

    PMID: 38286980
  10. 10

    A novel CPT1C variant causes pure hereditary spastic paraplegia with benign clinical course.

    Hong D, Cong L, Zhong S, et al.

    Annals of clinical and translational neurology 2019; (6(3)):610-614 doi:10.1002/acn3.717.

    PMID: 30911584

This page is for educational purposes only to help you understand an AD-HSP diagnosis. Always consult your neurologist or genetic counselor for medical advice regarding your specific condition and care plan.

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