Rotational Stability of Plastic Hinges

ce/papers ◽  
2021 ◽  
Vol 4 (2-4) ◽  
pp. 2325-2334
Author(s):  
Michael J Roberts ◽  
J Michael Davies
Keyword(s):  
Rotational Stability ◽  
Plastic Hinges

scholarly journals The Inverse Spacer—A Novel, Safe, and Cost-Effective Approach in Routine Procedures for Revision Knee Arthroplasty

2021 ◽  
Vol 10 (5) ◽  
pp. 971
Author(s):  
Kristoff Hammerich ◽  
Jens Pollack ◽  
Alexander F. Hasse ◽  
André El Saman ◽  
René Huber ◽  
...  
Keyword(s):  
Knee Arthroplasty ◽  
Clinical Success ◽  
Cost Effective ◽  
Revision Total Knee Arthroplasty ◽  
Rotational Stability ◽  
X Rays ◽  
Free Interval ◽  
Major Disadvantage ◽  
Cost Effective Approach ◽  
Before And After

Background: A major disadvantage of current spacers for two-stage revision total knee arthroplasty (R-TKA) is the risk of (sub-) luxation during mobilization in the prosthesis-free interval, limiting their clinical success with detrimental consequences for the patient. The present study introduces a novel inverse spacer, which prevents major complications, such as spacer (sub-) luxations and/or fractures of spacer or bone. Methods: The hand-made inverse spacer consisted of convex tibial and concave femoral components of polymethylmethacrylate bone cement and was intra-operatively molded under maximum longitudinal tension in 5° flexion and 5° valgus position. Both components were equipped with a stem for rotational stability. This spacer was implanted during an R-TKA in 110 knees with diagnosed or suspected periprosthetic infection. Postoperative therapy included a straight leg brace and physiotherapist-guided, crutch-supported mobilization with full sole contact. X-rays were taken before and after prosthesis removal and re-implantation. Results: None of the patients experienced (sub-) luxations/fractures of the spacer, periprosthetic fractures, or soft tissue compromise requiring reoperation. All patients were successfully re-implanted after a prosthesis-free interval of 8 weeks, except for three patients requiring an early exchange of the spacer due to persisting infection. In these cases, the prosthetic-free interval was prolonged for one week. Conclusion: The inverse spacer in conjunction with our routine procedure is a safe and cost-effective alternative to other articulating or static spacers, and allows crutch-supported sole contact mobilization without major post-operative complications. Maximum longitudinal intra-operative tension in 5° flexion and 5° valgus position appears crucial for the success of surgery.

scholarly journals Rotational Stability, Tilt and Decentration of a New IOL with a 7.0 mm Optic

2021 ◽  
pp. 1-8
Author(s):  
Jascha Wendelstein ◽  
Peter Laubichler ◽  
Isaak Fischinger ◽  
Siegfried Mariacher ◽  
Sophie Beka ◽  
...  
Keyword(s):  
Rotational Stability

Matched comparison of rotational stability of 1-piece acrylic and plate-haptic silicone toric intraocular lenses in Asian eyes

2012 ◽  
Vol 38 (4) ◽  
pp. 620-624 ◽  
Author(s):  
Wei-Han Chua ◽  
Leonard H. Yuen ◽  
Jocelyn Chua ◽  
Gillian Teh ◽  
Warren E. Hill
Keyword(s):  
Intraocular Lenses ◽  
Rotational Stability ◽  
Matched Comparison

Studies on Rotational Stability of 2-Aryl-3-(2-Fluorophenyl)Quinazolin-4-One Derivatives

Heterocycles ◽  
2021 ◽  
Vol 103 (1) ◽  
pp. 183
Author(s):  
Osamu Kitagawa ◽  
Asumi Iida ◽  
Kazuya Saito ◽  
Nanami Asada ◽  
Yuuki Fujimoto
Keyword(s):  
Rotational Stability

Biomechanical Evaluation of Anterolateral Ligament Repair augmented with Internal Brace

2021 ◽  
Author(s):  
Ryan P. Roach ◽  
David P. Beason ◽  
Jonathan S. Slowik ◽  
A. Ryves Moore ◽  
Ajay C. Lall ◽  
...  
Keyword(s):  
Internal Rotation ◽  
Acl Reconstruction ◽  
Cruciate Ligament ◽  
Surgical Techniques ◽  
Anterolateral Ligament ◽  
Torsional Stiffness ◽  
Rotational Stability ◽  
Gap Formation ◽  
Internal Brace ◽  
Acl Deficient

AbstractInjuries to the anterolateral ligament (ALL) of the knee are commonly associated with anterior cruciate ligament (ACL) ruptures. Biomechanical studies have demonstrated conflicting results with regard to the role of the ALL in limiting tibial internal rotation. Clinically, residual pivot shift following ACL reconstruction has been reported to occur up to 25% and has been correlated with poor outcomes. As such, surgical techniques have been developed to enhance rotational stability. Recent biomechanical studies have demonstrated restoration of internal rotational control following ALL reconstruction. The purpose of our study was to understand the biomechanical effects of ACL reconstruction with an ALL internal brace augmentation. We hypothesized that (1) sectioning of the ALL while preserving other lateral extra-articular structures would lead to significant internal rotation laxity and gap formation and (2) ALL repair with internal brace augmentation would lead to reduction in internal rotation instability and gap formation. In total, 10 fresh-frozen cadaveric knees were thawed and biomechanically tested in internal rotation for 10 cycles of normal physiologic torque in the intact, ACL-deficient, ACL/ALL-deficient, ACL-reconstructed, and ALL-repaired conditions. Each condition was tested at 30, 60, and 90 degrees of flexion. Following the final ALL-repaired condition, specimens were additionally subjected to a final internal rotation to failure at 1 degree at the last-tested degree of flexion. Kinematic measurements of angle and linear gap between the femur and tibia were calculated in addition to torsional stiffness and failure torque. As hypothesized, ALL repair with internal brace augmentation significantly reduced internal rotation angular motion and gap formation at flexion angles greater than 30 degrees. Additionally, ALL sectioning produced nonsignificant increases in internal rotation laxity and gap formation compared with ACL-deficient and ACL-reconstructed states, which did not support our other hypothesis.

Clinical outcomes and rotational stability of a 4-haptic toric intraocular lens in myopic eyes

2014 ◽  
Vol 40 (9) ◽  
pp. 1479-1487 ◽  
Author(s):  
Rita Mencucci ◽  
Eleonora Favuzza ◽  
Francesca Guerra ◽  
Giovanni Giacomelli ◽  
Ugo Menchini
Keyword(s):  
Clinical Outcomes ◽  
Intraocular Lens ◽  
Rotational Stability ◽  
Toric Intraocular Lens
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