I am 35 yr old male of slight build. On last day of a trek in Nepal (which was 8 hrs virtually all downhill)suffered severe pain on the outside of left knee. Was OK again within 3 days, but during following couple of months, any downhill walking of any longer than say 10-15 minutes & flares up again. However once back on flat or uphill ground, pain disappears almost immediately! If I do another trek in near future, to prevent re occurrence, are certain exercises/surgery required?!
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