Joseph E Hale

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Contact stress distributions were studied in vitro for 13 dog knees, with full-thickness osteochondral defects drilled in the weight-bearing area of both femoral condyles. Diameters of the circular defects were concentrically enlarged from 1 to 7 mm. Digitally-imaged Fuji film was used to record cartilage contact stress distribution on femoral condyles for(More)
We investigated alterations in the expression of mRNA for type II and type X collagen in fracture callus of experimentally induced diabetic animals compared with controls and performed radiographic, histological, immunocytochemical and biomechanical studies. Experimentally induced diabetic rats exhibited an alteration in the temporal expression of type II(More)
Diabetes mellitus has been shown to alter the properties of bone and impair fracture healing in both humans and animals. The objective of this study was to document changes in the structural and material properties of intact bone and bone with healed fractures in diabetic rats compared with nondiabetic controls after 3 and 4 weeks of healing. Rods were(More)
Contact stress distributions on the tibial plafond were mapped in a series of eight fresh-frozen cadaver specimens in which displaced lateral malleolar fractures were studied. These included gripping (a) by snugly lacing the foot in an athletic shoe, (b) by polymethylmethacrylate potting of the calcaneus alone, and (c) by potting of the calcaneus plus(More)
Fuji Pressensor film has been widely used for measurement of contact stresses in articular joints. In relatively smooth contact fields, measurement errors are reported to be in the range of approximately 10-15 percent. However, when local incongruities exist, strong contact stress gradients are present. This study investigates the film's capability to(More)
Despite the effectiveness of external fixation in the treatment of complex wrist fractures, the complication rate for this modality ranges from 20% to 62%. Common complications are related to the use of percutaneous metal pins and result in an average reoperation rate of 16%. In addition, external fixation is unable to prevent dorsal collapse of the radius(More)
The apparent biphasic material properties of 10-month osteochondral defect repair tissue were determined for a series of full thickness defects of 1, 3, or 5 mm diameter, created in weight-bearing regions of 48 canine femoral condyles. Load cell recordings from indentation tests were compared with resultant contact forces computed using a corresponding(More)
The effect of loading rate on specimen calibration was investigated for an implantable force sensor of the two-point loading variety. This variety of sensor incorporates a strain gage to measure the compressive load applied to the sensor due to tensile loading in a soft tissue specimen. The Achilles tendon in each of four human cadaveric lower extremities(More)
An objective, empirically based image-processing technique was devised to compensate for the presence of crinkle artifact in Pressensor pressure-sensitive film recordings. A spherical indentor was used to produce film stains which deliberately included radially directed artifact streaks, superimposed upon otherwise smooth, nearly axisymmetric stain(More)
OBJECTIVES To compare the biomechanical properties of a new nitinol intramedullary (IM) scaffold implant with those of volar plates for the treatment of dorsally comminuted extra-articular distal radius fractures using an established model. METHODS A dorsal wedge osteotomy was performed on a bone model to simulate a dorsally comminuted extra-articular(More)
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