Objective—To quantify bone mineral density (BMD) in the medial coronoid process (MCP) of dogs with and without fragmented medial coronoid processes (FMCPs) by use of dualenergy x-ray absorptiometry.
Sample Population—50 osteochondral samples from 31 dogs that underwent subtotal coronoid ostectomy for unilateral or bilateral FMCP and 10 control osteochondral samples of the MCP collected from forelimbs of 5 cadaveric Greyhounds.
Procedures—Each sample was mounted in proximodistal and mediolateral orientations for BMD determinations via dual-energy x-ray absorptiometry, and area-of-interest data (0.03-cm2 increments) were obtained. Values of BMD were compared between left and right limb control samples, between control and FMCP samples, and between axial and abaxial regions of the control or FMCP samples.
Results—The BMD in control and FMCP samples in both proximodistal and mediolateral orientations differed significantly. Mean BMD throughout the MCP was decreased in FMCP samples, compared with control sample findings. In both control and FMCP samples, BMD of the abaxial half of the MCP was 50% higher than that of the axial portion.
Conclusions and Clinical Relevance—The similar pattern of BMD in osteochondral samples of the MCP in dogs with and without FMCP indicated that the MCP was eccentrically loaded during weight bearing. Topographic variation in BMD in the MCP, and hence tolerance to compressive loading, suggested that the abaxial portion of the MCP in dogs was more resistant to compressive load than was the axial edge. This difference may predispose the coronoid process to microcrack formation and fragmentation at that juxtaposition.
Objective—To quantify angular excursions; net joint
moments; and powers across the stifle, tarsal, and
metatarsophalangeal (MTP) joints in Labrador
Retrievers and Greyhounds and investigate differences
in joint mechanics between these 2 breeds of
Animals—12 clinically normal dogs (6 Greyhounds
and 6 Labrador Retrievers) with no history of hind
Procedure—Small retroreflective markers were
applied to the skin over the pelvic limb joints, and a 4-
camera kinematic system captured data at 200 Hz in
tandem with force platform data while the dogs trotted
on a runway. Breed-specific morphometric data
were combined with kinematic and force data in an
inverse-dynamics solution for stance-phase net joint
moments and powers at the stifle, tarsal, and MTP
Results—There were gross differences in kinematic
patterns between Greyhounds and Labradors. At the
stifle and tarsal joints, moment and power patterns
were similar in shape, but amplitudes were larger for
the Greyhounds. The MTP joint was a net absorber of
energy, and this was greater in the Greyhounds.
Greyhounds had a positive phase across the stifle,
tarsal, and MTP joints at the end of stance for an
active push-off, whereas for the Labrador Retrievers,
the only positive phase was across the tarsus, and
this was small, compared with values for the
Conclusions and Clinical Relevance—Gross differences
in pelvic limb mechanics are evident between
Greyhounds and Labrador Retrievers. Joint kinetics in
specific dogs should be compared against breed-specific
patterns. (Am J Vet Res 2005;66:1563–1571)