Paul D Postak

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The forces and torques that occur during walking gait, particularly during toe-off, promote articulation in the posteromedial quadrant of tibial inserts. Retrieved components of failed knee arthroplasties show ultrahigh molecular weight polyethylene damage patterns in this region. Component-designed constraint, compromised polymer, and surgical factors(More)
The growth of spinal implant and orthobiologic technologies over the last several years is increasing in tempo (Figure 1) and fast approaching the US hip and knee markets in annual dollar sales. During this time, a number of start-up and established medical device manufacturers have focused increasing resources on solutions for spinal problems. The role of(More)
Tibial component shelf life was examined as a contributory factor of the in vivo failure of gamma sterilized prosthetic knee replacements. One hundred eighty-eight Synatomic total knee replacements sterilized by gamma irradiation in air were implanted by one surgeon into 147 patients between May 1985 and December 1994. Of these, 135 knees in 105 patients(More)
Radial head fracture combined with disruption of the soft-tissue restraints to proximal radial migration is defined as radioulnar dissociation. This injury often involves irreparable radial head fracture. When excised, management has emphasized the use of silicone implants to prevent proximal migration. However, concerns regarding silicone use led to the(More)
Five short-term in vivo disassembly of two-piece acetabular cup designs have been reported. This study evaluates the liner retention strengths of eight contemporary cup systems. Both push-out (663 +/- 65.5 pounds force to 29 +/- 1.4 pounds force) and lever-out (684 +/- 114 inch-pounds to 43 +/- 1.5 inch-pounds) test modes show a wide variation in retention(More)
OBJECTIVE To compare quantitatively the axial and torsional stiffness of a retrograde intramedullary nail and a fixed angle screw side plate in treating a supracondylar femur fracture in osteopenic femora. To determine the modes of failure of an intramedullary nail and a side plate under axial loading. DESIGN Matched pair cadaveric study. SETTING(More)
This study provides biomechanical support for a new technique of autograft anterior cruciate ligament reconstruction featuring circular bone plugs and endosteal interference fit fixation. Six matched pairs of fresh frozen human knees were utilized. Femoral interference fit pull-out strength was determined from material-testing-machine-generated oscillograph(More)