That is a good sign. When you placed him back on the ground did he assume the `legs out ahead' position, or did he try to assume a normal resting position?
I'd guess injury. I'd start him on aspirin (use the formula below and can calculate the proper amount - 5mg per kilogram - crush 81mg. tab - divide into four equal piles 20mg. per. daub up with grapes and feed them to him). See if this doesn't help.
Probably needs to be on soft bedding and isolated from rest of flock. Another idea is to suspend him in a sling for a few days. If this is going to improve it shouldn't take too long.
ACETYLSALICYLIC ACID - Aspirin (Butler; Vedco)
Available as tablets (5 or 60 grain) for oral administration. Also
available as 1.25 grain orange-flavored chewable tablets. May be
effective as an analgesic, antipyretic and anti-inflammatory agent
in some avian species. May be indicated to prevent clot formation
and embolisms secondary to egg-related peritonitis, granulomatous
diseases and shock. Uricosuric at low doses and may be
effective in some cases of acute and chronic gout. A five grain tablet
can be mixed in 30 ml of diluent and administered at a dose of 0.5
ml/kg, TID (or 1 tablet per pint of drinking water).
from: Avian medicine: Principles and Applications (formulary) here:
http://www.avianmedicine.net/ampa.html
