Intra-Articular Injection of 2 Different Dosages of Autologous and Allogeneic Bone Marrow- and Umbilical Cord-Derived Mesenchymal Stem Cells Triggers a Variable Inflammatory Response of the Fetlock Joint on 12 Sound Experimental Horses

Table 2

Synovial fluid effusion grading system measured by ultrasound.

Score		Ultrasound criteria
0	Normal	Mild amount of fluid in the proximopalmar recess of the metacarpo(tarso)phalangeal joint. Concave aspect of the skin. No motion of the fluid when pressing on the recess.
1	Mild	Mild amount of fluid in the proximopalmar recess of the metacarpo(tarso)phalangeal joint. Concave to flat aspect of the skin. Motion of the fluid when pressing on the recess.
2	Moderate	Moderate amount of fluid in the proximopalmar recess of the metacarpo(tarso)phalangeal joint. Convex aspect of the skin. Motion of the fluid when pressing on the recess.
3	Substantial	Substantial amount of fluid in the proximopalmar recess of the metacarpo(tarso)phalangeal joint and mild amount of fluid on the dorsal recess of the joint. Convex aspect of the skin.
4	Severe	Marked amount of fluid in the proximopalmar recess of the metacarpo(tarso)phalangeal joint and substantial amount of fluid on the dorsal recess of the joint with synovial pressure. Convex aspect of the skin.