Don't count on an MRI showing anything with Lyme. I don't know anything about MS or the timing of the lesions, but I do know Lyme can cause lesions in the brain that are indestinguishable from MS lesions.
My ankle only gets the stuck tendon once in a while...the only thing that helps is if I maneuver my foot around until the tendon gets un-stuck. Typically when it happens, it happens when sitting in the car, which isn't very convenient, LOL.
If the nerve that goes to a particular muscle is irritated by Lyme/Bart, then it can cause the muscle and associated tendon(s) to spasm. I get this in my gut a lot...
Take care & happy holidays,
Chronic Lyme Disease, Chronic Bartonella (clinical dx only), Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD ("Secondary Lupus-Like Syndrome"), Osteoporosis, chronic Lymphopenia, etc.; G-Tube; Currently trying to wean off TPN.
Meds: Pulmicort, IV Ceftazidime, Heparin (to flush PICC line), Claritin, Domperidone, Colloidal Silver (used topically), probiotics, Milk Thistle, Ailanthus, homeopathy.