Alireza Bashiri - Department of Surgery and Radiology, Faculty of Veterinary Medicine, University of Tehran,Tehran, Iran
Davood Sharifi - Department of Surgery and Radiology, Faculty of Veterinary Medicine, University of Tehran,Tehran, Iran
Mohammad Molazem - Department of Surgery and Radiology, Faculty of Veterinary Medicine, University of Tehran,Tehran, Iran

BACKGROUND: Hip Dysplasia is a frequent orthopedic disease that is characterized by early joint sublux- ation. The DARthroplasty technique is a two-part process that involves applying bone graft to increase the femoral head coverage with a low morbidity rate and the long term is known results. OBJECTIVES: This study was aimed to investigate the radiographic and clinical changes after transplanting the rib allograft impregnated with PRP and MSCs in the treatment of hip dysplasia in a dog. The current study was conducted to assess the effectiveness of modified DARthroplasty. METHODS:12 dogs were selected, all of them operated by the modified induced hip dysplasia. Afterward, an approximately 25 mm segment rib was harvested and transplanted at slot approximately 7 mm broad and 12.5 mm high, close craniodorsally to the joint capsule origin, and secured with a 2 mm cortical bone screw in each recipient dog. PRP and MSCs were injected into the gap around allograft. Subsequently, they were divided into 3 subgroups of 4 dogs in each group, control, PRP, and MSCs. 6 months after the surgery, all dogs were subjected to clinical and radiographic evaluations. RESULTS:Clinically, all dogs showed no sign of orthopedic disorder which was determined by Ortolani sign, and no muscle atrophy and pain were elicited in the hip joint. One dog showed a slight lameness degree about two weeks and one case had seroma but was immediately treated by aspiration and pressure bandage. Upon ra- diographic examination, no dislocation of the rib allograft could be detected. Bone proliferation was observed. Dogs in all groups showed NA and PC increase with MSCs (5.25 ± 0.3 and 22.5 ± 0.81), PRP group (6.5 ± 0.43 and 20.5 ± 0.12) and control group (6.5 ± 0.35 and 19 ± 1.23) at six months postoperatively. CONCLUSIONS: This study showed that rib bone allograft with PRP and MSCs can be quite effective on joint congruency and stability in symptomatic dogs due to hip dysplasia.

DARthroplasty, Hip dysplasia, Mesenchymal stem cells, PRP, Radiology