Neurology · Limb-Girdle Muscular Dystrophy R9

Recognizing the Symptoms of LGMDR9

At a Glance

LGMDR9 causes progressive weakness in the hip and shoulder muscles, often starting with difficulty climbing stairs or standing. It is critical for patients to also monitor for hidden respiratory and cardiac complications like sleep-disordered breathing and cardiomyopathy.

Understanding the symptoms of Limb-Girdle Muscular Dystrophy R9 (LGMDR9) is essential for proactive management. This condition, caused by mutations in the FKRP gene, primarily affects the “girdle” muscles of the hips and shoulders ^[1]. Because the age of onset and the speed of progression can vary significantly between individuals, knowing what to look for can help you and your care team stay ahead of potential complications ^[2].

Early Physical Signs

The first signs of LGMDR9 often involve proximal muscle weakness, which is weakness in the muscles closest to the center of the body, such as the thighs and upper arms ^[3].

Difficulty with Stairs and Standing: You may notice it becomes harder to climb stairs or stand up from a low chair. Some people use their hands to push on their thighs to stand up, a movement known as Gower’s sign ^[4].
Walking Changes: Changes in gait, such as a “waddling” walk or walking on the balls of the feet, are common early indicators ^[4].
Calf Hypertrophy: Interestingly, while many muscles weaken and thin (atrophy), the calf muscles may appear unusually large or overdeveloped. This is called pseudohypertrophy because the size is often due to the replacement of muscle tissue with fat and connective tissue rather than muscle strength ^[5].

Onset and Progression

The timing of the first symptoms can vary widely. Scientists have observed a “bimodal distribution,” meaning symptoms often cluster into two main groups ^[6].

Onset Type	Typical Features
Early-Childhood	Symptoms appear in early childhood; generally associated with a faster progression toward needing mobility aids ^[7].
Late-Childhood / Adult	Symptoms may not appear until the teens, 20s, or even later; typically follows a slower progression ^[7]^[6].

Even individuals with the same genetic mutation (such as the common c.826C>A founder mutation) can experience different symptoms and rates of change ^[2].

Hidden Respiratory Symptoms

Respiratory issues in LGMDR9 can be subtle because they often begin during sleep. This is known as sleep-disordered breathing (SDB) ^[8]. Because these symptoms happen while you are asleep, they are frequently underrecognized ^[8].

Warning signs of respiratory involvement include:

Morning Headaches: Often caused by the buildup of carbon dioxide overnight ^[8].
Daytime Fatigue: Feeling exhausted despite getting a “full night’s” sleep ^[9].
Frequent Nighttime Awakenings: Waking up gasping or feeling restless.
Weak Cough: Difficulty clearing your throat or lungs when you have a cold.

Cardiac Warning Signs

LGMDR9 is specifically associated with a risk of cardiomyopathy, a condition where the heart muscle weakens and cannot pump blood efficiently ^[10]. This risk increases as patients get older ^[10].

Cardiac symptoms can be “silent” in the early stages, making regular monitoring through an echocardiogram or cardiac MRI vital ^[11]^[12]. Be alert for:

Unusual shortness of breath during mild activity ^[8].
Palpitations or a feeling that your heart is skipping a beat.
Swelling in the ankles or feet.
Persistent fatigue that cannot be explained by muscle weakness alone ^[9].

Monitoring these symptoms through standardized tests, such as the 10-meter walk test or forced vital capacity (a breathing test), helps your doctors track the disease and adjust your care plan as needed ^[4]^[13].

Common questions in this guide

What are the early physical signs of LGMDR9?

Early signs typically involve weakness in the hip and shoulder muscles. You might notice difficulty standing from a low chair, a waddling walk, or needing to use your hands to push on your thighs to stand up, which is known as Gower's sign.

Why do my calf muscles look larger if LGMDR9 causes muscle weakness?

This is a condition called pseudohypertrophy. The calf muscles can appear unusually large or overdeveloped because the muscle tissue is being replaced by fat and connective tissue, rather than indicating actual muscle strength.

How does LGMDR9 affect my breathing and sleep?

Respiratory issues often begin subtly during sleep, which is known as sleep-disordered breathing. Warning signs include morning headaches, excessive daytime fatigue, frequent nighttime awakenings, and a weak cough.

Why is regular heart monitoring necessary for LGMDR9 patients?

LGMDR9 carries an increased risk of cardiomyopathy, a condition where the heart muscle weakens. Because cardiac symptoms can be silent in the early stages, routine monitoring with an echocardiogram or cardiac MRI is essential.

How fast do the symptoms of LGMDR9 progress?

Progression varies widely and often depends on when symptoms first appear. Early-childhood onset is generally associated with a faster disease progression, while symptoms that begin in late childhood or adulthood typically progress more slowly.

Curated prompts to bring to your next appointment.

1.What was the result of my most recent Forced Vital Capacity (FVC) test, and how does it compare to previous results?
2.Should I undergo a sleep study to check for nocturnal hypoventilation or sleep-disordered breathing, even if I don't feel sleepy?
3.How often should I have a cardiac MRI or echocardiogram to monitor for cardiomyopathy?
4.Based on my specific FKRP mutation, what is the typical progression pattern you have seen in other patients?
5.Are there specific signs of cardiac strain I should be looking for at home, such as changes in my resting heart rate or ankle swelling?

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References (13)

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
Limb girdle muscular dystrophy type 2I: No correlation between clinical severity, histopathology and glycosylated α-dystroglycan levels in patients homozygous for common FKRP mutation.
Alhamidi M, Brox V, Stensland E, et al.
Neuromuscular disorders : NMD 2017; (27(7)):619-626 doi:10.1016/j.nmd.2017.02.015.
PMID: 28479227
3
Limb-girdle muscular dystrophy: A perspective from adult patients on what matters most.
Hunter M, Heatwole C, Wicklund M, et al.
Muscle & nerve 2019; (60(4)):419-424 doi:10.1002/mus.26636.
PMID: 31298728
4
Predicting Loss of Ambulation in Limb Girdle Muscular Dystrophy R9.
Miller CL, Coffey LN, Mockler SRH, et al.
Annals of clinical and translational neurology 2026; (13(6)):1154-1159 doi:10.1002/acn3.70299.
PMID: 41486779
5
Molecular Study of the Fukutin-Related Protein (FKRP) Gene in Patients from Southern Italy with Duchenne/Becker-like Phenotype.
Qualtieri A, De Benedittis S, Cerantonio A, et al.
International journal of molecular sciences 2024; (25(19)) doi:10.3390/ijms251910356.
PMID: 39408683
6
Epidemiology and natural history in 101 subjects with FKRP-related limb-girdle muscular dystrophy R9. The Norwegian LGMDR9 cohort study (2020).
Jensen SM, Müller KI, Mellgren SI, et al.
Neuromuscular disorders : NMD 2023; (33(2)):119-132 doi:10.1016/j.nmd.2022.11.005.
PMID: 36522254
7
Progression to Loss of Ambulation Among Patients with Autosomal Recessive Limb-girdle Muscular Dystrophy: A Systematic Review.
Audhya IF, Cheung A, Szabo SM, et al.
Journal of neuromuscular diseases 2022; (9(4)):477-492 doi:10.3233/JND-210771.
PMID: 35527561
8
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
9
Pain interference and fatigue in limb-girdle muscular dystrophy R9.
Reelfs AM, Stephan CM, Mockler SRH, et al.
Neuromuscular disorders : NMD 2023; (33(6)):523-530 doi:10.1016/j.nmd.2023.05.005.
PMID: 37247532
10
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
11
Segmental Strain and Strain-Rate Imaging to Assess Cardiac Function in Patients With Limb-Girdle Muscular Dystrophy R9: An Observational Study of the Norwegian LGMDR9 Cohort.
Caglayan S, Akay Caglayan H, Jensen SM, et al.
Echocardiography (Mount Kisco, N.Y.) 2025; (42(6)):e70202 doi:10.1111/echo.70202.
PMID: 40460190
12
Patterns of cardiac involvement in different muscular dystrophies assessed by magnetic resonance imaging.
Goebel J, Schult K, Schara U, et al.
Acta radiologica (Stockholm, Sweden : 1987) 2023; (64(2)):605-611 doi:10.1177/02841851221077402.
PMID: 35147046
13
Natural History of Cardiac and Respiratory Involvement, Prognosis and Predictive Factors for Long-Term Survival in Adult Patients with Limb Girdle Muscular Dystrophies Type 2C and 2D.
Fayssoil A, Ogna A, Chaffaut C, et al.
PloS one 2016; (11(4)):e0153095 doi:10.1371/journal.pone.0153095.
PMID: 27120200

This page provides educational information on the symptoms and progression of LGMDR9. It is not a substitute for professional medical advice, diagnosis, or routine monitoring by your neuromuscular specialist.

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