Facts History: Foal Swollen right hind fetlock Ð Y (right hind limbÑunilateral--suggests trauma more likely) Very lameÑrefuses to use right hind limb-Y (suggests grade 4) Owner thinks mare stepped on foalÕs leg-Y (suggests trauma) Signalment: Thoroughbred Ð Y (breed disposition; conformation issues) Female intact filly - N 2 weeks old Ð Y (youngÑconsider congenital; flexible bones) Present history: No other problems Ð Y (suggests localized problem on limb) Nursing normally- Y (colostrum intake OK; nutrition probably OK) Past history: Mare current with vacs/dewormings Ð Y (R/0 infectious origin; passive immunity OK in foal) Foal has not been vaccinated or dewormed Ð N (normal for foal this age) Foal and mare part of small herd Ð Y (Are they kept together? Pasture or stable? All vaccinated? Other foals or stallions? Trauma potential?) PE: Temp 101.8 Pulse 60 Resp rate 52 (need to verify as normal - separate learning issue) BAR All systems normal except musculoskeletal Ð Y (suggests localized limb problem) Foal is toe-touching lame on right hind limb Ð Y (suggests high severity of lameness) Palp: soft-tissue swelling, pitting edema starting 12 cm proximal to fetlock and extending just distal to it; foal resents palpation of the area Ð Y (soft tissue trauma? Fracture causing swelling, edema? Puncture wound causing swelling?) Orthopedic exam: no foreign body in foot; foal does not resent examination with hoof testers Ð Y (suggests that foot not the problem, no navicular, etc.) Following manipul. of fetlock, foal is even more lame and does not put her foot on the ground; no instability or crepitance upon palpation Ð Y (exam exacerbates injury, puts pressure on joint)