Effects of intra-articular administration of hyaluronic acid or platelet-rich plasma as a complementary treatment to arthroscopy in horses with osteochondritis dissecans

Although arthroscopy is the treatment of choice for horses with osteochondritis dissecans (OCD), it is not yet known whether intra-articular therapies in the postoperative period can bring any benefit to the recovery of these animals. This study evaluated the effects of the intra-articular application of platelet-rich plasma (PRP), hyaluronic acid (HA) or lactated Ringer's solution (LR) in horses with OCD undergoing arthroscopy. Eighteen male and female Brazilian Sport horses aged between 2 and 6 years were evaluated. All animals presented OCD fragments in the middle crest of the tibia. Ten days after surgery, animals were randomly distributed into three groups and received intra-articular application of PRP (n = 6), HA (n = 6), or LR (control group, n = 6). Clinical, radiographic, ultrasound and synovial fluid evaluations were performed on the day of surgery and after 10, 30 and 60 days. An increase in the thickness of the joint capsule was observed 30 days after surgery in the three groups evaluated. In the control group, there was significant improvement in the flexion test 30 and 60 days after surgery, and in the PRP group, there was worsening of this parameter in the same evaluations. In the control group, there was a reduction in the degree of synovial effusion, and in the PRP and HA groups, there was increased effusion. There was a significant increase in the number of leukocytes in the HA group. Intra-articular use of PRP or HA ten days after arthroscopy did not promote positive effects on the recovery of horses with OCD.