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Of 26 dogs with elbow osteochondrosis, 11 had osteochondritis dissecans of the medial humeral condyle, seven had fragmentation of the coronoid process of the ulna and eight had both these lesions. Sixteen cases had bilateral involvement. The labrador and retriever breeds were most often affected and the male sex predominated. The clinical features included a foreleg lameness in a young immature dog with pain localised to the elbow joint. The most consistent radiological feature was the presence of osteophyte development especially on the dorsal aspect of the anconeal process, caused by secondary osteoarthritis. The authors are not certain that surgical treatment of elbow osteochondrosis is justified; more extended long-term studies are necessary before surgical and conservative therapeutic regimens can be fully evaluated.
Vet Rec 1981 Oct 10
PMID:Osteochondritis dissecans and fragmentation of the coronoid process in the elbow joint of the dog. 730 50

A biomechanical model of endochondral ossification (Frost and Jee, 1994. Anat. Rec., 240:435-446) can help to explain: (1) some differences in fracture patterns in children and adults, (2) increased fractures during the human adolescent growth spurt, (3) localization of stress fractures and pseudofractures to cortical instead of trabecular bone, (4) increased bone mass in adult-acquired and childhood obesity, (5) subchondral bone densification and osteopenia in some arthroses, (6) why and where mammals lose spongiosa with aging, (7) why, as percents of the original bone stock, metaphyseal trabecular bone losses with aging usually exceed cortical bone losses, (8) why osteochondritis dissecans and aseptic necroses of bone localize in epiphyses instead of metaphyses, (9) some features of growth plate histology in rickets and the chondrodystrophies, (10) why spontaneous fractures in osteoporotic patients affect vertebral more than metaphyseal spongiosa, (11) why osteopenias develop in most chronic, debilitating diseases, and (12) why histomorphometric values can differ in iliac bone biopsies obtained by the "vertical" Jamshidi and "horizontal" Bordier-Meunier techniques.
Anat Rec 1994 Dec
PMID:Perspectives: applications of a biomechanical model of the endochondral ossification mechanism. 787 97

Elbow arthroscopy was performed in 100 dogs with foreleg lameness localised to the elbow joint, bilaterally in 48 of them, making a total of 148 joints examined. Lesions in the area of the medial coronoid process varied from cartilage fissures in 13 to fragmentation in 91, chondromalacia-like lesions in 27. This last lesion has not been reported previously in the veterinary literature. Kissing lesions on the medial side of the humeral condyle were present in 83 joints, whereas lesions of osteochondritis dissecans were found in only three. All these lesions were associated with varying signs of synovitis and arthrosis. Arthroscopic signs of arthrosis and/or synovitis without associated medical coronoid lesions were found in 14 elbow joints.
Vet Rec 1997 Apr 05
PMID:Arthroscopic findings in 100 dogs with elbow lameness. 913 19

The presence and degree of tarsocrural joint effusion and lameness, and the result of a hindlimb flexion test were scored subjectively in 79 horses before, and six weeks to 20 months after, arthroscopic surgery to remove osteochondritis dissecans fragments. The scores of all three variables improved significantly after surgery. The score reductions for the right and left hindlimbs, respectively, were 82 per cent and 95 per cent for lameness, 48 per cent and 41 per cent for joint effusion, and 89 per cent and 84 per cent for reaction to flexion (P < or = 0.01). The oldest horses reacted more favourably to the operation, as measured by the reaction to the flexion test, but age was not significantly related to changes in lameness or joint effusion. There was no significant correlation between the time of follow-up examination and the effect of surgery on lameness and reaction to flexion, but an increased time to follow-up was associated with decreased joint effusion.
Vet Rec 2009 Dec 12
PMID:Lameness and effusion of the tarsocrural joints after arthroscopy of osteochondritis dissecans in horses. 2000 43

Shoulder pathology consistent with osteochondritis dissecans of the humeral head was diagnosed in two small-breed dogs. In both cases, the diagnosis was made tentatively on the basis of radiography and confirmed by arthroscopy of the affected shoulder joint. Both dogs were successfully treated by surgical removal of a flap of cartilage from the affected area. Clinical and radiographic follow-up was available in both cases. The excised cartilage flaps were examined histopathologically and showed the same characteristics as cartilage flaps from dogs of large breeds prone to developing osteochondritis dissecans of the shoulder.
Vet Rec 2010 Jan 30
PMID:Osteochondritis dissecans of the humeral head in two small-breed dogs. 2011 71