Skip to content
How It Works
Explore
Resources Ask a Question
Who It's For
Patients
Decode results, prep for appointments, weigh options.
Caregivers & advocates
Carry the research load for someone you love.
Providers & clinicians
Resources for patients in your practice.
Log In Ask a Question
PubMed This is a summary of 11 peer-reviewed journal articles Updated
Neurology

HSP Subtypes: Pure vs. Complicated Forms

At a Glance

Hereditary Spastic Paraplegia (HSP) is classified as either pure (affecting mainly the legs with stiffness and weakness) or complicated (involving additional neurological issues like ataxia, cognitive changes, or vision problems). Identifying your subtype helps determine the specialists needed for your care team.

When doctors talk about Hereditary Spastic Paraplegia (HSP), they often divide it into two main categories: Pure and Complicated. Knowing which “bucket” your symptoms fall into is essential because it helps your medical team provide the right support and gives you a clearer picture of what to expect over time.

Comparing the Two Forms

The primary difference is the “neighborhood” of symptoms. In Pure HSP, the symptoms stay mostly in the nerves that control the legs. In Complicated HSP, the condition affects other parts of the nervous system or other organs [1][2].

Feature Pure (Uncomplicated) HSP Complicated (Complex) HSP
Core Symptoms Muscle stiffness (spasticity) and weakness in the legs [1]. Leg spasticity and weakness PLUS additional neurological symptoms [3].
Common Additions Bladder urgency; decreased vibration sense in feet [2]. Balance issues (ataxia), cognitive changes, neuropathy, or vision issues [4][5].
Life Expectancy Typically normal [6]. Variable; depends on the specific genetic subtype [7].
Care Focus Mobility, physical therapy, and spasticity management [8]. Multi-system support including speech, cognitive, and occupational therapy [8][9].

Defining Complicated Symptoms

If you have Complicated HSP, you may experience “extra-neurological” symptoms—meaning they occur outside the standard pathway of leg stiffness. These can include:

  • Ataxia: Difficulty with coordination and balance that may affect your arms or your speech [4].
  • Cognitive Changes: Challenges with “executive functions,” such as planning, organizing, or processing information quickly [9][10].
  • Peripheral Neuropathy: Numbness, tingling, or “pins and needles” in the hands and feet [4][5].
  • Ophthalmological Issues: Problems with vision or eye movements, such as an inability to look upward easily [4][5].
  • Epilepsy: Seizures may occur in specific genetic subtypes, such as those related to the SPG11 gene [11].

Why This Matters for Your Care

Identifying your form of HSP is not about giving you a “worse” label; it’s about building the right team.

  • If you have Pure HSP, your team might be small: a neurologist, a physiatrist (rehab doctor), and a physical therapist [8].
  • If you have Complicated HSP, your team may need to be broader. You might benefit from seeing a neuropsychologist for cognitive support, an ophthalmologist for vision, or a speech-language pathologist if coordination affects your voice [8][9].

A Note on Variability

It is important to remember that these categories are not always rigid. Even within the same family or genetic subtype, one person may have very mild symptoms while another has a more complex presentation [4][2]. Your disease course is unique to you, and your care plan should be adjusted as your needs change over the years.

Return to Home

Common questions in this guide

What is the difference between pure and complicated HSP?
Pure HSP primarily affects the nerves controlling the legs, causing weakness and stiffness. Complicated HSP includes these leg symptoms but also involves other neurological issues, such as balance problems, cognitive changes, neuropathy, or vision loss.
Does having complicated HSP affect life expectancy?
While pure HSP typically does not affect life expectancy, the life expectancy for complicated HSP is variable. It largely depends on the specific genetic mutation and subtype causing the condition.
How does having complicated HSP affect my care team?
If you have complicated HSP, your care team will likely need to expand beyond a neurologist and physical therapist. You may benefit from seeing specialists like an ophthalmologist, neuropsychologist, or speech-language pathologist to manage additional symptoms.
Can HSP symptoms vary within the same family?
Yes, the severity and type of HSP symptoms can vary widely, even among relatives with the same genetic mutation. One person may experience very mild symptoms, while another has a much more complex presentation.
Does the gene mutation we found determine if my HSP is pure or complicated?
Certain genetic mutations are often linked to specific symptoms, such as the SPG11 gene being associated with seizures. Your doctor will use your genetic results along with your clinical symptoms to classify your disease course and guide your care strategy.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Based on my current symptoms, do you classify my HSP as 'pure' or 'complicated'?
  2. 2.Does the gene mutation we found typically result in a pure or complicated disease course?
  3. 3.Are there specific specialists (like a neuropsychologist or ophthalmologist) we should add to my care team based on my subtype?
  4. 4.What signs of 'complications' should I be watching for that might change our approach to my care?
  5. 5.How does this classification change our strategy for managing my daily activities and long-term planning?

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 (11)
  1. 1

    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
  2. 2

    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
  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

    Identification of a novel mutation in ATP13A2 associated with a complicated form of hereditary spastic paraplegia.

    Odake Y, Koh K, Takiyama Y, et al.

    Neurology. Genetics 2020; (6(5)):e514 doi:10.1212/NXG.0000000000000514.

    PMID: 33134512
  5. 5

    Identification of a novel MAG gene mutation with 22q11.21 microduplication linked to hereditary spastic paraplegia.

    Kavishwar M, Bisen P, Baheti S, Wade P

    BMJ case reports 2024; (17(12)) doi:10.1136/bcr-2024-260342.

    PMID: 39689926
  6. 6

    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
  7. 7

    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
  8. 8

    Pathophysiology, diagnostic work-up and management of balance impairments and falls in patients with hereditary spastic paraplegia.

    Nonnekes J, van Lith B, van de Warrenburg BP, et al.

    Journal of rehabilitation medicine 2017; (49(5)):369-377 doi:10.2340/16501977-2227.

    PMID: 28471471
  9. 9

    The cognitive profile of hereditary spastic paraplegia: a systematic review of the literature.

    Quinzi A, Capogna E, Guidi L, et al.

    Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology 2025; (46(12)):6393-6416 doi:10.1007/s10072-025-08408-z.

    PMID: 41032233
  10. 10

    Association of spinal cord structure with cognition in hereditary spastic paraplegia type 5.

    Chen X, Lin K, Qiu L, et al.

    Frontiers in neurology 2025; (16()):1639011 doi:10.3389/fneur.2025.1639011.

    PMID: 41551307
  11. 11

    Clinical and genetic spectrum of hereditary spastic paraplegia in Chinese children.

    Wang J, Fang F, Ding C, et al.

    Developmental medicine and child neurology 2023; (65(3)):416-423 doi:10.1111/dmcn.15385.

    PMID: 36109173

This page explains the differences between pure and complicated HSP for educational purposes. Always consult your neurologist to determine your specific diagnosis, subtype, and appropriate care plan.

Get notified when new evidence is published on Hereditary spastic paraplegia.

We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.