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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

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]: