Hi, thanks for writing to HCM.
In general, incomplete tears of the MCL are treated with
*temporary immobilization
* use of crutches for pain control
* Isometric, isotonic, and eventually isokinetic progressive resistive exercises are begun within a few days of subsidence of pain and swelling.
if the knee is not too painful, a hinged brace is used, and quadriceps strengthening exercises and straight leg raises are encouraged after few days.
I don't think there is any connection or relationship between MCL
injury and your shin pain.
Majority of the bone cancers in the early stags are PAINLESS with few exceptions.
Anyway, taking into consideration your age (72yrs), its always better to get an evaluation done.
Please consult an orthopedic surgeon and follow his advice.
Hope this information is helpful. Good day