Hereditary Spastic Paraplegia 
In depth look at this disease by John K. Fink, M.D., including genetic analysis, clinical features and FAQs.
http://www.med.umich.edu/hsp/Hereditary Spastic Paraplegia
HSP information sheet compiled by the National Institute of Neurological Disorders and Stroke.
http://www.ninds.nih.gov/health_and_medical/disorders/hereditarysp.htm
GeneClinics: An Overview
In depth details about hereditary spastic paraplegia. Includes a summary, definition, categories, diagnosis, genetic counseling and resources.
http://www.geneclinics.org/profiles/hsp/
MCW Healthlink: HSP
An article about hereditary spastic paraplegia, also called familial spastic paralysis.
http://healthlink.mcw.edu/article/921730935.html
Spastic Paraplegia Foundation
Supports on the upper motor neuron disorders hereditary spastic paraplegia and primary lateral sclerosis. Information about these conditions, disability resources, newsletters, news, announcements, research and support.
http://sp-foundation.org/
HSP/FSP Support Group
For people suffering from Familial Spastic Paraplegia. Includes a newsletter, discussion forum, links, and contact details.
http://www.hspgroup.org/
HSP Research Foundation
Aims to find a cure for hereditary spastic paraplegia, a degenerative, hereditary disease affecting mainly the lower limbs, causing spasticity and severely impairing mobility. Find details about the organization, how to get involved and resources.
http://www.hspersunite.org.au
