Meniscal total knee replacement differs from total condylar designs in that it allows free axial rotation. This reduces torque forces on the tibial component and may help to prevent aseptic loosening. The amount of rotation occurring in patients with meniscal total knee replacement was an average range of 6 degrees. The average movement of the polyethylene 'menisci' is 3 mm.
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http://dx.doi.org/10.1016/0268-0033(94)90022-1 | DOI Listing |
Sci Rep
December 2024
Department of Orthopaedics and Traumatology, The University of Hong Kong, Pok Fu Lam, Hong Kong.
Establishing normative values and understanding how proprioception varies among body parts is crucial. However, the variability across individuals, especially adolescents, makes it difficult to establish norms. This prevents further investigation into classifying patients with abnormal proprioception.
View Article and Find Full Text PDFRev Bras Ortop (Sao Paulo)
November 2024
Departmento de Cirurgia Ortopédica, IRCCS Azienda Ospedaliera Universitaria di Bologna, Bolonha, Itália.
A 33-year-old male patient developed distal femur chronic osteomyelitis with massive bone loss after an open grade-3b fracture. Following several failed treatments to eradicate infection, a tibial turn-up procedure was performed to provide a stable and functional stump. To avoid neurovascular problems, the popliteal vessels and sciatic nerve were moved medially, and the flap was rotated externally to decrease the collapse.
View Article and Find Full Text PDFAnat Rec (Hoboken)
December 2024
Biology Department, Northland Pioneer College, Holbrook, Arizona, USA.
Nothronychus graffami was a large therizinosaur represented by a single well-preserved individual from the Turonian Tropic Shale of southern Utah. It is characterized by an enlarged abdomen, small tail, and an extensively pneumatized axial skeleton, and is frequently regarded as herbivorous. Given the overall tail reduction and the development of a wide fused synsacrum with widely spaced acetabulae, it is reconstructed with an anteriorly rotated femur and a displaced resting ground reaction force anterior to the center of mass.
View Article and Find Full Text PDFBiomimetics (Basel)
December 2024
School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China.
Birds use their claws to perch on branches, which helps them to recover energy and observe their surroundings; however, most biomimetic flapping-wing aircraft can only fly, not perch. This study was conducted on the basis of bionic principles to replicate birds' claw and wing movements in order to design a highly biomimetic flapping-wing aircraft capable of perching. First, a posture conversion module with a multi-motor hemispherical gear structure allows the aircraft to flap, twist, swing, and transition between its folded and unfolded states.
View Article and Find Full Text PDFFoot Ankle Int
December 2024
Orthopaedic Surgery, Cedars-Sinai Medical Center, Los Angeles, CA, USA.
Background: Supination external rotation (SER) fibula fractures with abnormal medial clear space (MCS) on stress radiographs that normalizes with weightbearing radiographs, termed SER4a ankle fractures, pose a challenge in treatment decision making. This study aims to quantify differences in joint contact area, tibiotalar rotation, and translation using weightbearing computed tomography (CT) scans in SER4a ankle fractures.
Methods: Between November 2022 and September 2023, patients presenting with isolated Weber B fibula fractures were evaluated for inclusion.
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