Injury to the lateral capsular tissues of knee may accompany rupture anterior cruciate ligament (ACL). A distinct structure, anterolateral ligament, has been identified, and reconstruction strategies for this tissue in combination with ACL have proposed. However, biomechanical function is not well understood. Thus, study had two research questions: (1) What contribution stability ACL-sectioned knee? (2) Does bear increased load absence ACL?Twelve cadaveric knees from donors who were a mean...

A three-dimensional (3D) knee joint computational model was developed and validated to predict contact forces pressures for different degrees of malalignment. 3D created from high-resolution radiological images emulate passive sagittal rotation (full-extension 65°-flexion) weight acceptance. cadaveric mounted on a six-degree-of-freedom robot subjected matching boundary loading conditions. ligament-tuning process minimised kinematic differences between the robotically loaded cadaver specimen...

Background: The biomechanical effect of lateral extra-articular tenodesis (LET) performed in conjunction with anterior cruciate ligament (ACL) reconstruction (ACLR) on load sharing between the ACL graft and LET knee kinematics is not clear. Purpose/Hypothesis: purpose was to quantify (1) forces carried by both (2) tibiofemoral response simulated pivot shift laxity tests. We hypothesized that would decrease tibial translation (ATT) pivoting maneuvers during tests laxity. Study Design:...

Background: Modulation of the mechanical environment may profoundly affect healing tendon graft-bone interface. The purpose this study was to determine how controlled axial loading after anterior cruciate ligament reconstruction affects tendon-to-bone healing. Our hypothesis that cyclic a period immobilization would improve compared with associated immediate or prolonged immobilization. Methods: One hundred and fifty-six male Sprague-Dawley rats underwent use flexor digitorum longus...

Background: Abnormal tibiofemoral contact stress and aberrant kinematics may influence the progression of osteoarthritis in anterior cruciate ligament (ACL)–deficient ACL-reconstructed knee. However, relationships between after ACL reconstruction are poorly understood. Therefore, we posed following research questions: (1) How do deficiency affect joint? (2) What kinematic differences associated with abnormal reconstruction? Hypothesis: Center-center will not restore knee stress. Correlations...

Background: Ankle sprains may damage both the lateral ligaments of hindfoot and osteochondral tissue ankle joint. When nonoperative treatment fails, operative approaches are indicated to restore native motion patterns at joint contact mechanics. The goal present study was determine effect ligament injury, repair, reconstruction on mechanics patterns. Methods: Eight cadaveric specimens were tested with use robotic technology apply combined compressive (200-N) inversion (4.5-Nm) loads 0° 20°...

Background: The way in which force increases the anterolateral tissues and lateral extra-articular tenodesis (LET) tissue to resist internal rotation (IR) of tibia after anterior cruciate ligament (ACL) reconstruction isolation LET augmentation, respectively, is not well understood. Purpose: (1) To compare a cadaveric model how (ie, engages) with IR isolated ACL augmentation (2) determine whether related engagement tissue. Study Design: Controlled laboratory study. Methods: moments were...

Background: Successful anterior cruciate ligament reconstruction with use of soft-tissue grafts requires healing between tendon and bone. Little is known about the effect mechanical load on cellular molecular cascade tendon-to-bone healing. Understanding these influences has critical implications for postoperative rehabilitation following reconstruction. The purpose this study was to test hypothesis that, compared perioperative immobilization, short-duration low-magnitude cyclic axial...

Lateral column lengthening (LCL) of the calcaneus is commonly performed as part correction adult acquired flatfoot deformity. Increases in postoperative lateral plantar pressure associated with pain aspect foot have been reported. The aim this study was to investigate changes pressures forefoot increments 6, 8, and 10 mm LCL a cadaveric model. hypothesis that increasing incrementally by 2 will linearly increase forefoot.Eight fresh-frozen specimens were used. A robot compressively loaded 400...

The femoral insertion of the anterior cruciate ligament (ACL) has direct and indirect fiber types located within respective high (anterior) low (posterior) regions footprint.The fibers in region ACL footprint carry more force are isometric than footprint.Controlled laboratory study.Ten fresh-frozen cadaveric knees were mounted to a robotic manipulator. A 134-N at 30° 90° flexion combined valgus (8 N·m) internal (4 rotation torques 15° applied simulating tests rotatory stability. was...

Objectives/Goals: Injury to the medial knee ligaments (sMCL, dMCL, POL) and anterior cruciate ligament (ACL) can cause anteromedial rotatory instability (AMRI). AMRI ACL graft failure, but it is unclear how sMCL, POL, resist AMRI. We aimed characterize in-situ forces of under loading conditions involved with Methods/Study Population: characterized in situ 1) isolated external tibial rotation torque (ER), 2) force (Ant), 3) combined ER+Ant loading. Twenty-eight human cadaveric knees (18 male;...

Background: Adult anterior cruciate ligament (ACL) reconstruction techniques may be inappropriate to treat skeletally immature patients because of the risk physeal complications. “Physeal-sparing” exist, but their ability restore knee stability and contact mechanics is not well understood. Purpose: (1) To assess all-epiphyseal (AE) over-the-top (OT) kinematics, (2) whether these decrease high posterior stresses seen with ACL deficiency, (3) determine AE or OT technique produces abnormal...

We previously demonstrated, in a rat anterior cruciate ligament (ACL) graft reconstruction model, that the delayed application of low-magnitude-strain loading resulted improved tendon-to-bone healing compared with observed after immediate and prolonged immobilization. The purpose this study was to determine effect higher levels strain on healing.ACL carried out model three randomly assigned groups: high-strain daily beginning either (1) postoperative day one (immediate-loading group; n = 7)...

Background: A more detailed assessment of the anatomy entire medial ulnar collateral ligament complex (MUCLC) is desired as rate elbow reconstruction surgery continues to rise. Purpose: To quantify MUCLC, including anterior bundle (AB), posterior (PB), and transverse (TL). Study Design: Descriptive laboratory study. Methods: Ten unpaired, fresh-frozen cadaveric elbows underwent 3-dimensional (3D) digitization computed tomography with 3D reconstruction. Ligament footprint areas geometries,...

Throwing injuries.To study the effects of posterior capsule tightness on humeral head position in late cocking simulation.Eight fresh frozen shoulders were placed "late cocking," 90 degrees abduction, and 10 adduction maximal external rotation. 3D measurements relationship to glenoid taken with an infrared motion sensor, both before after suture plication capsule. Plications 20% posterior/inferior entire performed, followed by plications 40% capsule.Cadaver Lab.Posterior capsular...

A multibody model of the knee was developed and predicted ligament forces kinematics during passive flexion corroborated subject-specific measurements obtained from a human cadaveric that tested using robotic manipulator. The incorporated novel strategy to estimate slack length fibers based on experimentally measured at full extension included multifiber representations for cruciates. captured (≤ 5.7 N root mean square (RMS) difference), coupled internal rotation 1.6 deg RMS anterior...

Knee instability in midflexion may contribute to patient dissatisfaction following total knee arthroplasty (TKA). Midflexion involves abnormal motions and tissue loading multiple planes. Therefore, we quantified compared the tensions carried by medial lateral collateral ligaments (MCL LCL) posterior-stabilized (PS) TKA through flexion, then these with those native knee. Finally, examined relationships between ligament anterior tibial translation (ATT).

This study quantified and compared the efficacy of in-shoe orthoses ankle braces in stabilizing hindfoot medial longitudinal arch a cadaveric model acquired flexible flatfoot deformity. was addressed by combining measurement kinematics with plantar pressure distribution, produced response to axial loads simulating quiet standing. Experiments were conducted on six fresh-frozen lower limbs. Three conditions tested: intact-unbraced; flatfoot-unbraced; flatfoot-braced. Flatfoot deformity created...

Aims Surgeons commonly resect additional distal femur during primary total knee arthroplasty (TKA) to correct a flexion contracture, which leads femoral joint line elevation. There is paucity of data describing the effect elevation on mid-flexion stability and kinematics. Thus, goal this study was quantify laxity. Methods Six computational models with cadaver-specific capsular collateral ligament properties were implanted posterior-stabilized (PS) TKA. A 10° contracture created in each model...