While you may have been trying to move your lead knee in advance to allow your arms to come down before body rotation in the downswing, you were not successful. You start moving the club at the same time as your lead knee.
As you continue in the downswing you do not maintain the bend in your trail arm and drive your trail elbow toward your side so that at the point where the club is horizontal in the downswing:
1) Your trail elbow is well away from your trail hip
2) Your trail arm has very little bend
3) The club is outside of your hands (and over the plane). Notice the position of the clubhead at that point in bdog's gallery
As a result of these the shot is a pull and your trail arm is completely straight at impact ('rod' and not 'claw').
All of this would be improved with the vertical drop of Keystone (trail elbow dropping towards trail side) prior to torso/hip rotation.