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 1

Fetlock joint effusion grading system.

Score		Physical criteria
0	Normal	Concave aspect of the proximopalmar recess of the metacarpo(tarso)phalangeal joint. No lateral swelling when a medial pressure is applied on the recess.
1	Mild	Flat aspect of the proximopalmar recess of the metacarpo(tarso)phalangeal joint. Mild lateral swelling when a medial pressure is applied on the recess.
2	Moderate	Convex aspect of the proximopalmar recess of the metacarpo(tarso)phalangeal joint. Lateral swelling easy to obtain when a medial pressure is applied on the recess.
3	Substantial	Convex aspect of the proximopalmar recess of the metacarpo(tarso)phalangeal joint exceeding the suspensory ligament branches (third interosseous muscle). Soft consistency of the recess on palpation.
4	Severe	Convex aspect of the proximopalmar recess of the metacarpo(tarso)phalangeal joint exceeding the suspensory ligament branches (third interosseous muscle) with a hard consistency of the recess on palpation indicating synovial pressure. Synovial distension of the dorsal recess of the joint.