In December 2005, I was in an accident that resulted in shattering my left tibia and breaking my left kneecap. In the two seasons since I have come back from those injuries, I have struggled mightily, in large part due to trying to garner some consistency in my knee bend. Prior to the accident, I bowled with a pretty deep knee bend. Now, I can't seem to consistently put all my weight on my knee in that deep a bend, and I haven't figured out how to adjust to not bending as deep (or at all), to the point that from game to game (or, more often, shot to shot) my posture and position vary greatly. At the end of last season, my leg was tired enough (and I was discouraged enough) that I put my balls away, and haven't touch them since. Instead, I have focused more on strengthening and conditioning in hopes of getting the leg strong enough to bear the load of me bowling another season. Now that the new season is rapidly approaching, I'm going to spend some time out on the lanes to get ready. My question is (supposing I still can't consistently bowl with a significant knee bend)for the guys who have battled knee issues, what kind of adjustments did you make, physically and mentally, and have they worked for you?

I have strugggled with my knee this season, especially the last few months.  It has been to the point I have had to not bowl several league sessions. I also couldn't bowl like I usually do in North Carolina . While at The Gathering, some one suggested staying more upright.  

I tried it this week, in league Tuesday, Wenesday & Thursday.  I had to start more upright and slow my approach down which caused some timing issues, especially Tuesday.  A completely different feel and forced me to be more accurate to score, there is less room for error.  BUT the knee held for all three league sessions.
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USBC Bronze Coach

"I cannot change the direction of the wind but I can adjust my sails to reach my destination." Jimmy Dean
Quaker 10/93 - 4/07
Quaker

I agree with the knee brace.  If you don't want to get a prescription brace, even a cheap one from Walmart will at least help.

The other thing I see with people rehab'ing their knee is they tend to forget about the posterior part of the knee and leg.  Make sure you are doing exercises (leg curls is one of the best) to strengthen the hamstrings and rear ligaments.  They take more of your weight than most think and they are often overlooked when working back from a knee injury.