Minimal attention has been directed toward tibial tunnel position and the native anterior cruciate ligament (ACL) footprint.To evaluate effect of on restoration knee kinematics stability after ACL reconstruction.Controlled laboratory study.Ten paired cadaveric knees were subjected to biomechanical testing (standardized Lachman mechanized pivot-shift examination). With each maneuver, a computer-assisted navigation system recorded 3-dimensional motion path tracked point at center tibia, medial...

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: Recent laboratory and clinical studies report no difference between single-bundle (SB) double-bundle (DB) anterior cruciate ligament (ACL) reconstruction. Hypothesis: Anatomical DB ACL reconstruction would restore knee kinematics in a complex injury model of ACL–meniscus closer to the intact state when compared with 2 common SB reconstructions. Study Design: Controlled study. Methods: Five fresh-frozen cadaveric hip-to-toe lower extremity specimens were used for this study (10...

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...

Version correction via eccentric reaming reduces clinically important retroversion in Walch type B2 glenoids (those with substantial glenoid and a second, sclerotic neoglenoid cavity) before total shoulder arthroplasty (TSA). Clinically, an increased risk of component loosening was hypothesized to be the result compromised bone quality attributable reaming. However, no established guidelines exist regarding how much version can applied without compromising bone.(1) How does correlate depth...

Reverse total shoulder replacement (RTSR) depends on adequate deltoid function for a successful outcome. However, the anterior and/or axillary nerve may be damaged due to prior procedures or injury. The purpose of this study was determine compensatory muscle forces required scapular plane elevation following RTSR when is deficient. soft tissues were removed from six cadaver shoulders, except tendon attachments. After implantation RTSR, shoulders mounted custom-made simulator mean force in...

Custom flange acetabular components (CFACs) are a patient-specific option for addressing large defects at revision total hip arthroplasty (THA), but patient and implant characteristics that affect survivorship remain unknown. This study aimed to identify design factors related survivorship.A retrospective review of 91 patients who underwent THA using 96 CFACs was undertaken, comparing features between radiologically failed successful cases. Patient (demographic, clinical, radiological)...

Knee instability following anterior cruciate ligament (ACL) rupture is common, compromising function, and causing cartilage meniscal damage. In this study, at the level of articular surfaces was characterized with a new measure: instability. Articular defined as change in location center contact stress per unit applied load. The effect ACL-deficiency on quantified response to combined abduction internal rotation moments simulating clinical pivot shift, which recreates sensation Eleven...

Success of shoulder surgery depends on implant fixation to the glenoid trabecular bone. The purpose this study was evaluate anatomic characteristics normal bone microarchitecture help assist in design and provide data for finite element analyses. Eight cadavers without evidence osteoarthritis were used. Glenoids scanned with micro-computed tomography then divided into lateral medial, superior, inferior, anterior, posterior quadrants (8 total segments). Each segment analyzed mineral density,...

Anterior cruciate ligament (ACL) injury may cause knee instability and result in damage to the menisci articular cartilage. The pivot shift test is commonly used identify rotational of following ACL. magnitude lateral compartment translation correlates well with grade shift. However, navigation systems do not readily provide individualized compartmental translation. We aimed develop software (a) quantify individual medial during test, (b) generate animated three-dimensional renderings...

Osteogenesis imperfecta is a rare genetic disorder that presents with heterogeneous phenotypes ranging from brittle bones to impaired hearing. Because of the decreased bone mineral density frequently observed in this patient population, many patients experience recurring and long-term fractures, which often require orthopaedic management. With advancement nonsurgical surgical management increased longevity osteogenesis imperfecta, incidence osteoarthritis has risen, presenting new...

Thursday, April 30April 14, 2020Free AccessPredictors of Withdrawal Life Sustaining Treatments in ECMO Patients (4792)Julia Carlson, Clare Enriquez, Glenn Whitman, Dan Choi, Romergryko Geocadin, and Sung-Min ChoAuthors Info & AffiliationsApril 2020 issue94 (15_supplement)https://doi.org/10.1212/WNL.94.15_supplement.4792 Letters to the Editor