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Diseases

Genetic and Rare Diseases Information Center (GARD)

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Kuskokwim disease


Other Names for this Disease

  • Arthrogryposis-like disorder
  • Arthrogryposis-like syndrome
  • Kuskokwim syndrome
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Symptoms

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What are the signs and symptoms of Kuskokwim disease?

The range and and severity of signs and symptoms in individuals with Kuskokwim disease can vary, even among siblings. Affected individuals usually have congenital contractures, especially of lower extremities, which progress during childhood and persist for the lifetime of the individual. However, not all individuals with the condition have contractures at birth. The severity of contractures can be very asymmetrical in any given individual. The knees and elbows are often affected, and skeletal abnormalities of the spine, pelvis, and feet also commonly occur. Muscle atrophy of limbs with contractures and displacement of kneecaps (patellae) have also been reported.

Milder skeletal features are common. Vertebral features may include spondylolisthesis, mild to moderate scoliosis, and/or lordosis. Many affected individuals have had several low-energy fractures. Other skeletal abnormalities that have been reported include bunions (hallux valgus), "flat feet" (plano valgus feet), and clubfoot (talipes equinovarus). Development and arrangement of the teeth (dentition) are normal.

Although some individuals with full bilateral contractures of the knees can move about by “duck walking” (sitting with buttocks on their heels) or by “knee walking” (moving on their knees with their lower legs drawn up behind them to their buttocks), most affected individuals are treated with leg braces and/or surgery in childhood and can walk upright.[1]
Last updated: 8/8/2013

The Human Phenotype Ontology provides the following list of signs and symptoms for Kuskokwim disease. If the information is available, the table below includes how often the symptom is seen in people with this condition. You can use the MedlinePlus Medical Dictionary to look up the definitions for these medical terms.

Signs and Symptoms Approximate number of patients (when available)
Gait disturbance 90%
Limitation of joint mobility 90%
Patellar aplasia 90%
Talipes 50%
Abnormal form of the vertebral bodies 7.5%
Abnormality of the clavicles 7.5%
Aplasia/Hypoplasia of the radius 7.5%
Melanocytic nevus 7.5%
Scoliosis 7.5%
Amyotrophy -
Autosomal recessive inheritance -

Last updated: 9/2/2014

The Human Phenotype Ontology (HPO) has collected information on how often a sign or symptom occurs in a condition. Much of this information comes from Orphanet, a European rare disease database. The frequency of a sign or symptom is usually listed as a rough estimate of the percentage of patients who have that feature.

The frequency may also be listed as a fraction. The first number of the fraction is how many people had the symptom, and the second number is the total number of people who were examined in one study. For example, a frequency of 25/25 means that in a study of 25 people all patients were found to have that symptom. Because these frequencies are based on a specific study, the fractions may be different if another group of patients are examined.

Sometimes, no information on frequency is available. In these cases, the sign or symptom may be rare or common.


References
  1. Barnes AM et al. Kuskokwim Syndrome, a Recessive Congenital Contracture Disorder, Extends the Phenotype of FKBP10 Mutations. Hum Mutat. May 25, 2013; [Epub ahead of print]:


Other Names for this Disease
  • Arthrogryposis-like disorder
  • Arthrogryposis-like syndrome
  • Kuskokwim syndrome
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.