Parkinson’s can cause stiffness/ heaviness in legs but is unlikely to be responsible for sore legs. Knee replacement may be associated with complications that are likely to be confined to the joint. Sore, tired and stiff legs could occur due to a variety of reasons like neurological disorders, muscle weakness/ myopathy, vascular abnormalities, bone or joint degeneration/ inflammation, micronutrient deficiency, hormonal/ endocrine/ metabolic disorders etc. Without a clinical evaluation it would be difficult to determine the cause of your symptoms. It would be best to get this evaluated by a primary care physician. After a cause is suspected or diagnosed, it can be managed accordingly or specialist care may be sought.
Hope this helps.
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