Betteridge's three-year minimum term in his indeterminate sentence came to an end in December 2008 without a Parole Board review having taken place.
BBC: Rapist Samuel Betteridge wins damages from government
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Lincolnshire law firm Sills and Betteridge has also launched a campaign to keep the prison open, saying converting it could lead to delays in the area's criminal justice system.
BBC: Lincoln Prison could become immigration removal centre
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"Access to the best treatments, and the latest technology, is vitally important to people living with a long term condition such as arthritis", said Neil Betteridge, its head of public policy.