What treatment do I need to get rid of or help shape my tree trunk like legs? (photo)

Shaping the legs is really a great art and can help change a person's life. Liposuction of  the legs is easy to undergo and so worth it. Recovery is quick since most patients are back to work in 2 days and back to the gym in 1 week. Go for it !!!!

Knees are a tricky area, and a physical exam will be necessary to determine if this will result in improvement based upon amount of fat and the skin laxity present.  This area is more prone to contour irregularity after liposuction, and as such liposuction should be limited.  You also do not want to have an issue with falling skin. 
Another option might be computer controlled BodyTite which is safe with regards to the risk of burning as the energy delivered from the liposuction cannula tip is turned off by the computer when the optimal temperature is reached.   Melting and removal of the fat by the canunula provide durable long term results with significant skin retraction and without scarring and long down time.  
Kenneth Hughes, MD, Board Certified Plastic Surgeon
Los Angeles, CA

My first comment would be to say that you do not appear to have "tree trunk" legs.  It is difficult to fully assess from just the one photo that you have supplied, but it does appear that you may be a suitable candidate for liposuction to improve the contour of your knees and thighs.  In general terms liposuction is good for small areas of excess fat, whilst skin excision is required if there is alot of loose skin either before or after the anticipated liposuction.The fat that is removed from liposuction does not return.  If you put on weight then it will preferentially go to other areas that still have fat cells.  I hope this helps.  Kind regards Kim