Chico's stifle(?)

[guest@endurance.net]

Ray O. rno2m@virginia.edu
 Put him up at a trial friday nite on his aforementioned roomy
stake-out.Saturday a.m.,cold,went to take him up to the trailer and get
the day started.Clipped the lead rope on him,turned my back on him and
started to step off,when-resistance.Turned around-there he is with his
head stuck out towards me,and the right rear extended back,seemingly
"stuck".Took the slack out of the rope,gently encouraged him to back up a
bit,which he would have done on his own,etc.,then led him up to the
trailer,walked him around a bit,tacked him up and rode him during the day
with no problems.This same sequence has happened 3 or 4 times in the last
year or so,sometimes at home,not exertion related.This is a
cow-hocked,toed out at the rear horse.VERY agile,very high mileage-even
perhaps by you E-folks' standards.14 years old,very fit and well cared
for.Heavy on the forehand all his life,even when much younger.
Reccomendations?