438 results found
Beynnon BD, Amis AA, 1998, In vitro testing protocols for the cruciate ligaments and ligament reconstructions, Knee Surgery, Sports Traumatology and Arthroscopy, Vol: 6, Pages: 70-76, ISSN: 1433-7347
Bull AMJ, Amis AA, 1998, The pivot-shift phenomenon: a clinical and biomechanical perspective, The Knee, Vol: 5, Pages: 141-158, ISSN: 0968-0160
Farahmand F, Tahmasbi MN, Amis AA, 1998, Lateral force-displacement behaviour of the human patella and its variation with knee flexion - a biomechanical study in vitro, Journal of Biomechanics, Vol: 31, Pages: 1147-1152, ISSN: 0021-9290
Beynnon BD, Amis AA, 1998, In vitro testing protocols for the cruciate ligaments and ligament reconstructions., Knee Surg Sports Traumatol Arthrosc, Vol: 6 Suppl 1, Pages: S70-S76, ISSN: 0942-2056
The techniques that have been used to characterize the biomechanical behavior of the knee, cruciate ligaments, and cruciate ligament replacements differ, making comparisons between studies difficult or, at times, impossible. Therefore, it is important to standardize the testing protocols and techniques that describe the biomechanical behavior of the knee and cruciate ligaments. This will allow investigators to express opinions with respect to the interpretation of data, rather than based on differences between testing techniques. Standardized techniques are proposed to locate the origins of the tibial and femoral coordinate systems, and thus, allow comparisons of knee kinematics (e.g., displacements and rotations) between investigations. Standard techniques that can be used to measure the load-displacement behavior of the knee are described, and important considerations that should be appreciated with respect to preparing and testing of the joint are summarized. It is important to evaluate the single cycle load-to-failure characteristics and the cyclic loading response of an anterior cruciate ligament graft, and techniques to evaluate cruciate ligament graft fixation are proposed. The strengths of different models to characterize the biomechanical behavior of the knee are reviewed.
Amis AA, 1998, Biomechanics of the elbow, Joint replacement in the shoulder and elbow, Editors: Wallace, Publisher: Butterworth Heinemann, Pages: 103-125, ISBN: 9780750613675
Jakob RP, Amis AA, 1998, Editorial, Knee Surgery, Sports Traumatology and Arthroscopy, Vol: 6, Pages: S1-S1, ISSN: 0942-2056
Race A, Amis AA, 1998, PCL reconstruction - In vitro biomechanical comparison of 'isometric' versus single and double-bundled 'anatomic' grafts, Journal of Bone and Joint Surgery-British Volume, Vol: 80B, Pages: 173-179, ISSN: 0301-620X
Bull AMJ, Berkshire FH, Amis AA, 1998, Accuracy of an electromagnetic measurement device and application to the measurement and description of knee joint motion, Proceedings of the Institution of Mechanical Engineers Part H-Journal of Engineering in Medicine, Vol: 212, Pages: 347-355, ISSN: 0954-4119
Bull AMJ, Amis AA, 1997, Accuracy of an electromagnetic tracking device, JOURNAL OF BIOMECHANICS, Vol: 30, Pages: 857-858, ISSN: 0021-9290
Bull AM, Amis AA, 1997, Accuracy of an electromagnetic tracking device., J Biomech, Vol: 30, Pages: 857-859, ISSN: 0021-9290
McGurk M, Slabberti HDV, Amis AA, et al., 1997, A preliminary report of a case using an intra-oral distraction device, British Dental Journal, Vol: 183, Pages: 63-66, ISSN: 0007-0610
Rossouw DJ, McElroy BJ, Amis AA, et al., 1997, A biomechanical evaluation of suture anchors in repair of the rotator cuff, Journal of Bone and Joint Surgery-British Volume, Vol: 79B, Pages: 458-461, ISSN: 0301-620X
McGurk M, Amis AA, Potamianos P, et al., 1997, Rapid prototyping techniques for anatomical modelling in medicine, Annals of the Royal College of Surgeons of England, Vol: 79, Pages: 169-174, ISSN: 0035-8843
Amis AA, 1997, Biomechanics of bone, tendon and ligament, Sciences basic to orthopaedics, Editors: Hughes, McCarthy, Saunders, London, Pages: 222-239, ISBN: 9780702019739
Amis AA, 1996, Absorbable sutures in tendon repair., J Hand Surg Br, Vol: 21, ISSN: 0266-7681
Zafiropoulos G, Amis AA, 1996, Fixation strength of the ulnar component of total elbow replacement., Journal of shoulder and elbow surgery / American Shoulder and Elbow Surgeons ... [et al.], Vol: 5, Pages: 97-102, ISSN: 1058-2746
After clinical failure of ulnar component fixation by olecranon fracture occurred, this study examined different component designs to find the strongest type. Components requiring square cuts or rounded cuts to prepare the proximal ulna with short or long stems of polyethylene or metal were implanted in paired cadaver bones and tested to failure. Loads were applied through the articular surface in an anterior-posterior direction, causing bending fracture of the olecranon. The main findings were a higher strength if the bone was prepared to take a rounded rather than a square-shaped prosthesis body, a slightly higher strength with a metal component compared with a similarly shaped polyethylene component, and slightly less strength if a longer stem was used. We recommend the use of a polyethylene component with a rounded shape and short stem, because it will be thinner, entailing less bone excavation. Additionally, it is less costly than a metal-backed design.
Zafiropoulos G, Amis AA, 1996, Fixation strength of the ulnar component of total elbow replacement, Journal of Shoulder and Elbow Surgery, Vol: 5, Pages: 97-102, ISSN: 1058-2746
Amis AA, 1996, Untitled, Journal of Hand Surgery-British and European Volume, ISSN: 0266-7681
Race A, Amis AA, 1996, Cross-sectional area measurement of soft tissue. A new casting method, Journal of Biomechanics, Vol: 29, Pages: 1207-1212, ISSN: 0021-9290
Amis AA, Farahmand F, 1996, Extensor mechanism of the knee, Current Orthopaedics, Vol: 10, Pages: 102-109
Amis AA, 1996, The ovine stifle as a model for human cruciate ligament surgery, Veterinary and Comparative Orthopaedics and Traumatology, Vol: 9, Pages: 134-139, ISSN: 0932-0814
Amis AA, 1996, Is polyethylene still the best prosthetic bearing surface?, Journal of Bone and Joint Surgery-British Volume, Vol: 78, Pages: 345-348, ISSN: 0301-620X
Race A, Amis AA, 1996, Loading of the two bundles of the posterior cruciate ligament: an analysis of bundle function in A-P drawer, Journal of Biomechanics, Vol: 29, Pages: 873-879, ISSN: 0021-9290
Amis AA, Farahmand F, 1996, Biomechanics masterclass: extensor mechanism of the knee, Current Orthopaedics, Vol: 10, Pages: 102-109, ISSN: 0268-0890
WILLIAMS RJN, AMIS AA, 1995, A NEW-TYPE OF FLEXOR TENDON REPAIR - BIOMECHANICAL EVALUATION BY CYCLIC LOADING, ULTIMATE STRENGTH AND ASSESSMENT OF PULLEY FRICTION IN-VITRO, JOURNAL OF HAND SURGERY-BRITISH AND EUROPEAN VOLUME, Vol: 20B, Pages: 578-583, ISSN: 0266-7681
Williams RJ, Amis AA, 1995, A new type of flexor tendon repair. Biomechanical evaluation by cyclic loading, ultimate strength and assessment of pulley friction in vitro., J Hand Surg Br, Vol: 20, Pages: 578-583, ISSN: 0266-7681
Experiments were performed to evaluate biomechanical aspects of the performance of a "deep-biting peripheral suture" for flexor tendon repair, either when used alone or with a square or modified Kessler core stitch, and the technique was compared to the Kleinert repair. Tests included progressively increasing cyclic loads, force to pull the repair into the A2 pulley, and ultimate failure strength. 50% of the Kleinert repairs failed under 30 N cyclic loading, while 100% of the DBPS plus Kessler core stitch repairs survived. There was no discernable difference in gliding function or repair bulk between these sutures, but ultimate strength increased significantly with the DBPS repairs. We concluded that the DBPS plus Kessler-type core stitch will survive active mobilization better than the Kleinert method.
AMIS AA, MILLER JH, 1995, THE MECHANISMS OF ELBOW FRACTURES - AN INVESTIGATION USING IMPACT TESTS IN-VITRO, INJURY-INTERNATIONAL JOURNAL OF THE CARE OF THE INJURED, Vol: 26, Pages: 163-168, ISSN: 0020-1383
Amis AA, Zavras TD, 1995, Isometricity and graft placement during anterior cruciate ligament reconstruction, The Knee, Vol: 2, Pages: 5-17, ISSN: 0968-0160
This review paper starts with some basic definitions of anatomical positioning nomenclature and isometry, examines the reasons for aiming for isometry and discusses the tensile properties of ligaments and grafts in the light of length changes imposed by knee motion. An examination of the biomechanics of different tibial and femoral graft attachments, and the effects of errors from 'isometric' siting, leads into a review of previous literature of studies on the intact anterior cruciate ligament (ACL), ACL-deficient knees and then of ACL reconstructions. The discussion notes that there has been little work done to link the behaviour of reconstructed knees to that of the intact knees which the surgery is aiming to reproduce, and suggests that an anatomical graft placement, with the attachments eccentric to the isometric areas of intact knees, may approach this aim. © 1995.
Zavras TD, Mackenney RP, Amis AA, 1995, The natural history of anterior cruciate ligament reconstruction using patellar tendon autograft, The Knee, Vol: 2, Pages: 211-217, ISSN: 0968-0160
The purpose of this study was to review the results of ACL reconstruction using a patellar tendon graft placed 'over the top' plus a Macintosh lateral tenodesis, examining changes in knee laxity and functional status with increasing time. There were 74 patients operated on over an 11 year period, and divided into four groups for analysis according to postoperative time. There was a significant and progressive increase in side-to-side laxity difference with time, although functional status did not change significantly, indicating a lack of correlation between objective clinical tests and subjective findings. The highest Lysholm, Tegner and IKDC scores were at 4-5 years after operation, when 60% of patients were at their pre-injury level of sports activity. However, there was always a very significant difference between actual and desired Tegner activity levels for the group as a whole. While there was a significant correlation between degenerative changes and the time between injury and reconstruction, there was no correlation with postoperative time: this provides evidence that ACL reconstruction can protect the knee from later degeneration. © 1996.
RADFORD WJP, AMIS AA, HEATLEY FW, 1994, IMMEDIATE STRENGTH AFTER SUTURE OF A TORN ANTERIOR CRUCIATE LIGAMENT, JOURNAL OF BONE AND JOINT SURGERY-BRITISH VOLUME, Vol: 76B, Pages: 480-484, ISSN: 0301-620X
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