To compare gap displacement at various intervals of cyclic testing and biomechanical load to failure a Krackow patellar tendon repair augmented with high-strength suture tape versus the standard transosseous technique for inferior pole rupture.Twelve matched pairs cadaveric knees were used (8 males 4 females; mean age 79.6 years, range 57 96). An rupture was simulated after random assignment specimens in each pair or technique. Each specimen then repetitively cycled from 90° 5° 1,000 cycles....

Combined medial and lateral plate fixation is recommended for complex tibial plateau fractures with fragments or no cortical bone contact. Although such adequate to resist forces during range of motion, it may be insufficient support immediate postoperative weightbearing. Here, we analyzed displacement, stiffness, failure simulated full weightbearing bicondylar treated combined locking fixation.We used 10 fresh-frozen adult human cadaveric tibias mated femurs. Osteotomies were performed an...

Small changes in deltoid tension and moment arm due to glenosphere lateralization may be associated with an increase acromion or scapular spine strain reverse shoulder arthroplasty (RSA), which can lead stress fracture. The coracoacromial ligament (CAL) protective lower the seen on spine. This biomechanical study investigated impact of CAL integrity after RSA.Ten cadaveric specimens were tested a custom dynamic frame. Acromial measured at 0°, 30°, 60° abduction using rosettes fixed (Levy...

Background: When performing a medial patellofemoral ligament (MPFL) reconstruction, surgeons may place the MPFL graft under higher than anatomic tension to minimize chance of recurrent instability. Purpose: To investigate whether lateral retinacular release (LRR) significantly decreases contact pressures after an overtensioned (OT) reconstruction. Study Design: Controlled laboratory study. Methods: Mean and peak pressure across joint at 30°, 45°, 60° flexion was assessed in 14 cadaveric knee...

This study evaluated whether the addition of a nitinol staple-plate to single cannulated screw increased mechanical stability for talonavicular fixation construct.Twenty matched pairs cadaveric feet were randomized fusion with either 5.5-mm or and plate 2 screws slot an 18-mm staple. After in situ procedure, joint complex was dissected free ends embedded epoxy. The specimens then cyclically loaded on servohydraulic load frame (1000 cycles at 20 N, increasing intervals N until failure), half...

Debate exists on the optimum fixation construct for large avulsion fractures of fifth metatarsal base. We compared biomechanical strength 2 headless compression screws vs a hook plate these fractures.Large were simulated 10 matched pairs fresh-frozen cadaveric specimens. Specimens assigned to receive two 2.5-mm or an anatomic plate, then cyclically loaded through plantar fascia and underwent 100 cycles at 50%, 75%, 100% physiological load total 300 cycles.The group demonstrated significantly...

Introduction: There is little biomechanical evidence to support the traditional guideline that 45° represents acceptable proximal humerus deformity. We evaluated glenohumeral contact pressure (GP) and area, subacromial pressure, joint abduction assess changes with different deformities. Methods: Fifteen fresh-frozen cadaver shoulders were used. Intact specimens tested on a custom dynamic shoulder frame. Subsequently, surgical neck fracture was made in each specimen fixed using dual hinge...

Adjustable cortical fixation devices have demonstrated utility in orthopaedic applications, such as ankle syndesmosis repair.To assess the cyclic gap formation of a quadriceps tendon repair technique using an adjustable device compared with knotless suture anchors and tape, modification conventional anchor repair.Controlled laboratory study.Eight fresh-frozen matched pairs cadaveric knees were used. Specimens each pair randomized to undergo either modified (control) or repair. The control...

Repair of perilunate dislocations requires stabilization the carpal bones, although there is limited research on preferred method(s) stabilization. We compared biomechanical characteristics K-wire versus staple fixation scapholunate (SL) and lunotriquetral (LT) intervals in wrist. After creating a grade IV instability model, 20 cadaver wrists were randomized into 2 model groups using K-wires or surgical staples across SL LT intervals. For each ligament, two one was used to stabilize proximal...

Osteoporotic patients are at risk of peri-implant fractures after distal radius fixation. A unicortical screw in the proximal hole plate can theoretically decrease stress riser formation by eliminating far bone cortex. This construct has been proposed orthopedic literature to prevent but not tested an osteoporotic model.

Category: Hindfoot; Other Introduction/Purpose: There are few comparative studies between the traditional triple arthrodesis and commonly performed modified procedure in which calcaneocuboid joint is spared. Earlier investigations proposed that stiffening lateral column of hindfoot can increase plantar pressures, potentially precipitating pain. We used a cadaver model to quantify potential for reduced overload achieved by sparing cadaveric simulating standing on both neutral sloping surface....

Category: Basic Sciences/Biologics; Ankle; Hindfoot Introduction/Purpose: The tall Controlled Ankle Motion (CAM) boot and the short CAM are commonly used devices to immobilize foot ankle. However, effect of these on joint contact pressures is unknown. objective this study assess ankle, subtalar, talonavicular, calcaneocuboid joints. We hypothesize that both will reduce ankle hindfoot joints, with having greatest effect. Methods: Eight lower extremity cadaver specimens were mounted a...