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PubMed This is a summary of 36 peer-reviewed journal articles Updated
Neurology · Limb-Girdle Muscular Dystrophy R9

Comprehensive Guide to FKRP-Related Limb-Girdle Muscular Dystrophy R9 (LGMDR9)

At a Glance

Limb-girdle muscular dystrophy R9 (LGMDR9), formerly LGMD2I, is a rare genetic condition caused by FKRP gene mutations that weakens hip and shoulder muscles. Proper management requires a neuromuscular specialist, plus proactive heart and lung monitoring.

Understanding a diagnosis of Limb-Girdle Muscular Dystrophy R9 (LGMDR9), formerly known as LGMD2I, can be overwhelming. Because it is a rare genetic condition, your local doctors might not have extensive experience with it, and it can be easy to feel lost in a sea of medical terminology [1].

This guide is designed to empower you. LGMDR9 is caused by mutations in the FKRP gene and primarily affects the “girdle” muscles of the hips and shoulders [1]. But it is more than just muscle weakness—it requires proactive monitoring of your heart and lungs, and an understanding of how your specific genetics influence your disease [2][3].

The pages below will help you navigate your diagnosis, build your care team, and understand the promising research on the horizon:

01

Recognizing the Symptoms of LGMDR9

Learn to recognize the early symptoms of LGMDR9, including muscle weakness, calf pseudohypertrophy, and hidden cardiac and respiratory warning signs.

02

Biology and Getting the Right Diagnosis

Learn how to get an accurate LGMDR9 diagnosis. Understand the FKRP gene, why misdiagnosis is common, and the role of MRIs, biopsies, and genetic testing.

03

Genetics and Your Mutation Type

Learn how your FKRP gene mutation type affects limb-girdle muscular dystrophy R9 (LGMDR9). Understand inheritance, genotypes, and what your results mean.

04

Standard of Care and Medical Management

Learn the standard of care for LGMDR9 (FKRP-related muscular dystrophy). Discover proactive cardiac and respiratory monitoring, safe exercises, and care teams.

05

What to Expect and Future Therapies

Learn what to expect with LGMDR9 progression and mobility. Discover emerging future therapies like BBP-418 (Ribitol) and AAV gene therapy in clinical trials.

Common questions in this guide

What is limb-girdle muscular dystrophy R9 (LGMDR9)?
LGMDR9 is a rare genetic condition caused by mutations in the FKRP gene. It primarily causes progressive muscle weakness in the hips and shoulders, which are known as the girdle muscles.
Was LGMDR9 previously known by another name?
Yes, LGMDR9 was formerly classified as LGMD2I. The medical community updated the naming system to better reflect the specific genetic causes of different limb-girdle muscular dystrophies.
What doctors do I need to see for LGMDR9?
Your care should be led by a neuromuscular specialist. Because LGMDR9 can also affect your heart and lungs, it is critical to have proactive, ongoing monitoring by a cardiologist and a pulmonologist.
Why is it important to know my specific genetic mutation for LGMDR9?
LGMDR9 is caused by specific mutations in the FKRP gene. Understanding your exact genetics helps predict how the disease might progress and determines your eligibility for future targeted therapies and clinical trials.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.What is your specific experience treating limb-girdle muscular dystrophies, and specifically LGMDR9?
  2. 2.If you haven't managed many cases of LGMDR9, can you help refer me to a specialized neuromuscular clinic?
  3. 3.How will we coordinate care between you, my cardiologist, and my pulmonologist?

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 (3)
  1. 1

    Global FKRP Registry: observations in more than 300 patients with Limb Girdle Muscular Dystrophy R9.

    Murphy LB, Schreiber-Katz O, Rafferty K, et al.

    Annals of clinical and translational neurology 2020; (7(5)):757-766 doi:10.1002/acn3.51042.

    PMID: 32342672
  2. 2

    Cardiomyopathy in limb girdle muscular dystrophy R9, FKRP related.

    Libell EM, Richardson JA, Lutz KL, et al.

    Muscle & nerve 2020; (62(5)):626-632 doi:10.1002/mus.27052.

    PMID: 32914449
  3. 3

    Insomnia and sleep-disordered breathing in FKRP-related limb-girdle muscular dystrophy R9. The Norwegian LGMDR9 cohort study (2020).

    Jensen S, Abeler K, Friborg O, et al.

    Journal of neurology 2024; (271(1)):274-288 doi:10.1007/s00415-023-11978-7.

    PMID: 37695533

This guide provides educational information on FKRP-related LGMDR9 and does not replace professional medical advice. Always consult your neuromuscular specialist, cardiologist, or pulmonologist regarding your specific care plan.

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