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  • Title: Diagnostic and surgical arthroscopy of the equine shoulder joint.
    Author: Nixon AJ.
    Journal: Vet Surg; 1987; 16(1):44-52. PubMed ID: 3507124.
    Abstract:
    An arthroscopic technique for examination and surgical treatment of conditions of the shoulder joint was evaluated in eight normal horses and two horses with osteochondrosis lesions. A single arthroscope entry point caudal to the infraspinatus tendon allowed inspection of the cranial, lateral, and caudal surfaces of the shoulder joint. With the humeral head and glenoid cavity distracted by a curved forceps, the entire cartilage surface of the shoulder could be examined. The caudomedial portion of the humeral head was seen better with a 70 degree angled arthroscope. Instruments for intra-articular manipulation were introduced through a separate skin incision 2 to 4 cm caudal to the arthroscope entry point. Two horses with osteochondrosis lesions of the shoulder were examined arthroscopically and debrided with instrument triangulation. Five normal horses and both horses with osteochondrosis lesions were euthanized immediately after the procedure and a necropsy was performed. Minor iatrogenic damage to the cartilage surfaces and joint capsule resulted from the technique. Three horses recovered from anesthesia and were killed 3, 30, or 60 days after surgery. Subcutaneous fluid that accumulated during surgery had resorbed by 3 days and lameness was evident for 12 to 24 hours. Gross examination and histopathologic findings of specimens collected at 30 and 60 days showed several small nonhealing partial-thickness cartilage defects attributed to instrument insertion. Arthroscopy is a satisfactory method to examine the joint surfaces and to evaluate and treat osteochondrosis lesions of the shoulder joint in horses.
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