Rheumatoid Arthritis - After only three sessions of physiotherapy for my arthritic finger joints and a trigger finger, I now have improved painless finger movements. Katrina Therapy work by appointments only and I get my full hour of therapy which consists of a paraffin wax treatment, a manual massage, an ultra sound massage and finger exercises. At Katrina Therapy Centre the staff is friendly, yet professional and best of all, there is no waiting.