Imperial College London

ProfessorAndrewAmis

Faculty of EngineeringDepartment of Mechanical Engineering

Professor
 
 
 
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Contact

 

+44 (0)20 7594 7062a.amis

 
 
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Assistant

 

Ms Fabienne Laperche +44 (0)20 7594 7033

 
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Location

 

713City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

430 results found

Masouros SD, McDermott ID, Bull AMJ, Amis AAet al., 2010, Biomechanics, The Meniscus, Editors: Beaufils, Verdonk, Berlin, Germany, Publisher: Springer, Pages: 29-37, ISBN: 9783642024498

This clinical guide provides a special focus on the normal meniscal mechanism, body and function.

Book chapter

Cashman PMM, Baring T, Reilly P, Emery RJH, Amis AAet al., 2010, Measurement of migration of soft tissue by modified Roentgen stereophotogrammetric analysis (RSA): validation of a new technique to monitor rotator cuff tears., J Med Eng Technol, Vol: 34, Pages: 159-165

The purpose of this study was to develop a technique to use Roentgen stereophotogrammetric analysis (RSA) to measure migration of soft-tissue structures after rotator cuff repair. RSA stereo films were obtained; images were analysed using a semi-automatic software program allowing 3D viewing of results. RSA imaging experiments were performed to validate the technique, using a glass phantom with implanted RSA beads and an animal model with steel sutures as RSA markers which were moved known distances. Repeated measurements allowed assessment of inter- and intra-observer variability at a maximum of 1.06 mm. RSA analysis of the phantom showed a variation up to 0.22 mm for static and 0.28 mm for dynamic studies. The ovine tissue specimen demonstrated that using steel sutures as RSA markers in soft tissue is feasible, although less accurate than when measuring bone motion. This novel application of RSA to measure soft tissue migration is practicable and can be extended to in vivo studies.

Journal article

Junaid S, Gupta S, Sanghavi S, Anglin C, Emery R, Amis A, Hansen Uet al., 2010, Failure mechanism of the all-polyethylene glenoid implant, JOURNAL OF BIOMECHANICS, Vol: 43, Pages: 714-719, ISSN: 0021-9290

Journal article

Iranpour F, Merican AM, Dandachli W, Amis AA, Cobb JPet al., 2010, The Geometry of the Trochlear Groove, CLINICAL ORTHOPAEDICS AND RELATED RESEARCH, Vol: 468, Pages: 782-788, ISSN: 0009-921X

Journal article

Masouros SD, Bull AMJ, Amis AA, 2010, (i) Biomechanics of the knee joint, ORTOPAED TRAUMA, Vol: 24, Pages: 84-91

The knee joint has biomechanical roles in allowing gait, flexing and rotating yet remaining stable during the activities of daily life, and transmitting forces across it. Geometrical, anatomical and structural considerations allow the knee joint to accomplish these biomechanical roles. These are addressed and discussed in this article.

Journal article

Iranpour F, Merican AM, Rodriguez y Baena F, Cobb JP, Amis AAet al., 2010, Patellofemoral Joint Kinematics: The Circular Path of the Patella around the Trochlear Axis, J Orthop Res, Vol: 28, Pages: 589-594, ISSN: 0736-0266

Differing descriptions of patellar motion relative to the femur have resulted from previous studies. We hypothesized that patellar kinematics would correlate to the trochlear geometry and that differing descriptions could be reconciled by accounting for differing alignments of measurement axes. Seven normal fresh-frozen knees were CT scanned, and their kinematics with quadriceps loading was measured by an optical tracker system. Kinematics was calculated in relation to the femoral epicondylar, anatomic, and mechanical axes. A novel trochlear axis was defined, between the centers of spheres best fitted to the medial and lateral trochlear articular surfaces. The path of the center of the patella was circular and uniplanar (root-mean-square error 0.3 mm) above 16 +/- 3 degrees (mean +/- SD) knee flexion. In the coronal plane, this circle was aligned 6 +/- 2 degrees from the femoral anatomical axis, close to the mechanical axis alignment. It was 91 +/- 3 degrees from the epicondylar axis, and 88 +/- 3 degrees from the trochlear axis. In the transverse plane it was 91 +/- 3 degrees and 88 +/- 3 degrees from the epicondylar and trochlear axes, respectively. Manipulation of the data to different axis alignments showed that differing previously published data could be reconciled. The circular path of patellar motion around the trochlea, aligned with the mechanical axis of the leg, is easily visualized and understood. (C) 2009 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 28:589-594, 2010

Journal article

Gregory T, Hansen U, Taillieu F, Baring T, Brassart N, Mutchler C, Amis A, Augereau B, Emery Ret al., 2009, Glenoid Loosening after Total Shoulder Arthroplasty: An In Vitro CT-Scan Study, JOURNAL OF ORTHOPAEDIC RESEARCH, Vol: 27, Pages: 1589-1595, ISSN: 0736-0266

Journal article

Merican AM, Sanghavi S, Iranpour F, Amis AAet al., 2009, The structural properties of the lateral retinaculum and capsular complex of the knee, JOURNAL OF BIOMECHANICS, Vol: 42, Pages: 2323-2329, ISSN: 0021-9290

Journal article

Ghosh KM, Merican AM, Iranpour F, Deehan DJ, Amis AAet al., 2009, The effect of overstuffing the patellofemoral joint on the extensor retinaculum of the knee, KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 17, Pages: 1211-1216, ISSN: 0942-2056

Journal article

Chia S-L, Merican AM, Devadasan B, Strachan RK, Amis AAet al., 2009, Radiographic features predictive of patellar maltracking during total knee arthroplasty, KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 17, Pages: 1217-1224, ISSN: 0942-2056

Journal article

Smith CD, Masouros S, Hill AM, Amis AA, Bull AMJet al., 2009, A biomechanical basis for tears of the human acetabular labrum, BRITISH JOURNAL OF SPORTS MEDICINE, Vol: 43, Pages: 574-578, ISSN: 0306-3674

Journal article

Strachan RK, Merican AM, Devadasan B, Maheshwari R, Amis AAet al., 2009, A Technique of Staged Lateral Release to Correct Patellar Tracking in Total Knee Arthroplasty, JOURNAL OF ARTHROPLASTY, Vol: 24, Pages: 735-742, ISSN: 0883-5403

Journal article

Merican AM, Amis AA, 2009, Iliotibial band tension affects patellofemoral and tibiofemoral kinematics, JOURNAL OF BIOMECHANICS, Vol: 42, Pages: 1539-1546, ISSN: 0021-9290

Journal article

Ghosh KM, Merican AM, Iranpour-Boroujeni F, Deehan DJ, Amis AAet al., 2009, Length Change Patterns of the Extensor Retinaculum and the Effect of Total Knee Replacement, JOURNAL OF ORTHOPAEDIC RESEARCH, Vol: 27, Pages: 865-870, ISSN: 0736-0266

Journal article

Apsingi S, Bull AMJ, Deehan DJ, Amis AAet al., 2009, Review: femoral tunnel placement for PCL reconstruction in relation to the PCL fibre bundle attachments, KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 17, Pages: 652-659, ISSN: 0942-2056

Journal article

Smith CD, Masouros SD, Hill AM, Wallace AL, Amis AA, Bull AMJet al., 2009, The Compressive Behavior of the Human Glenoid Labrum May Explain the Common Patterns of SLAP Lesions, ARTHROSCOPY-THE JOURNAL OF ARTHROSCOPIC AND RELATED SURGERY, Vol: 25, Pages: 504-509, ISSN: 0749-8063

Journal article

Merican AM, Ghosh KM, Deehan DJ, Amis AAet al., 2009, The Transpatellar Approach for the Knee in the Laboratory, JOURNAL OF ORTHOPAEDIC RESEARCH, Vol: 27, Pages: 330-334, ISSN: 0736-0266

Journal article

Apsingi S, Nguyen T, Bull AMJ, Unwin A, Deehan DJ, Amis AAet al., 2009, A comparison of modified Larson and 'anatomic' posterolateral corner reconstructions in knees with combined PCL and posterolateral corner deficiency, KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 17, Pages: 305-312, ISSN: 0942-2056

Journal article

Merican AM, Kondo E, Amis AA, 2009, The effect on patellofemoral joint stability of selective cutting of lateral retinacular and capsular structures, JOURNAL OF BIOMECHANICS, Vol: 42, Pages: 291-296, ISSN: 0021-9290

Journal article

Chong DYR, Hansen UN, Amis AA, 2009, COMPUTATIONAL BIOMECHANICAL ANALYSIS OF FIXATION PERFORMANCE AND BONE RESORPTION OF TIBIAL PROSTHESIS IMPLANTATION, ASME Summer Bioengineering Conference, Publisher: AMER SOC MECHANICAL ENGINEERS, Pages: 975-976

Conference paper

Kessler O, Bull AMJ, Amis AA, 2009, A method to quantify alteration of knee kinematics caused by changes of TKR positioning., Journal of Biomechanics, Vol: 42, Pages: 665-670

Journal article

Masouros SD, Parker KH, Hill AM, Amis AA, Bull AMJet al., 2009, Testing and modelling of soft connective tissues of joints: a review, Journal of Strain Analysis for Engineering Design, Vol: 44, Pages: 305-318

There is wealth of data from experimental and numerical methods of analysing and modelling soft connective tissues of joints. In recent years, the advances in computational and technological capabilities allowed for several aspects of the function and mechanical behaviour of soft connective tissues of joints to be explored. However, the nature of soft tissue poses a great challenge in characterising its material behaviour in a repeatable and physiologically or clinically relevant manner. This review article attempts to present, critique and suggest experimental and numerical methods that are associated with the function and mechanical response of soft connective tissues of joints.

Journal article

Masouros SD, McDermott ID, Amis AA, AMJ Bet al., 2008, Biomechanics of the meniscus-meniscal ligament construct of the knee, KNEE SURG SPORT TR A, Vol: 16, Pages: 1121-1132, ISSN: 0942-2056

The menisci of the knee act primarily to redistribute contact force across the tibio-femoral articulation. This meniscal function is achieved through a combination of the material, geometry and attachments of the menisci. The main ligaments that attach the menisci to the tibia (insertional ligaments, deep medial collateral ligament), the femur (meniscofemoral ligaments, deep medial collateral ligament) and each other (the anterior intermeniscal ligament) are the means by which the contact force between tibia and femur is distributed into hoop stresses in the menisci to reduce contact pressure at the joint. This means that the functional biomechanics of the menisci cannot be considered in isolation and should be considered as the functional biomechanics of the meniscus-meniscal ligament construct. This article presents the current knowledge on the anatomy and functional biomechanics of the meniscus and its associated ligaments. Much is known about the function of the meniscus-meniscal ligament construct; however, there still remain significant gaps in the literature in terms of the properties of the anterior intermeniscal ligament and its function, the properties of the insertional ligaments, and the most appropriate ways to reconstruct meniscal function surgically.

Journal article

Amadi HO, Gupte CM, Lie DTT, McDermott ID, Amis AA, Bull AMJet al., 2008, A biomechanical study of the meniscofemoral ligaments and their contribution to contact pressure reduction in the knee, Knee Surgery Sports Traumatology Arthroscopy, Vol: 16, Pages: 1004-1008, ISSN: 0942-2056

The aim of this study was to test the hypothesis that the meniscofemoral ligaments (MFLs) of the human knee assist the lateral meniscal function in reducing tibiofemoral contact pressure. Five human cadaveric knee joints were loaded in axial compression in extension using a 4-degree of freedom rig in a universal materials testing machine. Contact pressures pre- and post-sectioning of the MFLs were measured using pressure sensitive film. Sectioning the MFLs increased the contact pressure significantly in the joints for two of the four measures. In addition to their known function in assisting the posterior cruciate ligament (PCL) to resist tibiofemoral posterior drawer, the MFLs also have a significant role in reducing contact stresses in the lateral compartment. Their retention in PCL and meniscal surgery is therefore to be advised.

Journal article

Dandachli W, 2008, Frames of Reference for Morphometric Analysis of the Hip Joint

Thesis dissertation

Smith CD, Masouros S, Hill AM, Wallace AL, Amis AA, Bull AMJet al., 2008, Mechanical testing of intra-articular tissues. Relating experiments to physiological function, CURRENT ORTHOPAEDICS, Vol: 22, Pages: 341-348, ISSN: 0268-0890

Journal article

Bull AMJ, Kessler O, Alam M, Amis AAet al., 2008, Changes in knee kinematics reflect the articular geometry after arthroplasty, CLINICAL ORTHOPAEDICS AND RELATED RESEARCH, Vol: 466, Pages: 2491-2499, ISSN: 0009-921X

Journal article

Brassart N, Sanghavi S, Hansen UN, Emery RJ, Amis AAet al., 2008, Loss of rotator cuff tendon-to-bone interface pressure after reattachment using a suture anchor, JOURNAL OF SHOULDER AND ELBOW SURGERY, Vol: 17, Pages: 784-789, ISSN: 1058-2746

Journal article

Ismail M, Karim A, Shulman R, Amis A, Calder Jet al., 2008, The Achillon achilles tendon repair: is it strong enough?, Foot Ankle Int, Vol: 29, Pages: 808-813, ISSN: 1071-1007

BACKGROUND: Open repair of the Achilles tendon is associated with wound breakdown, infection and percutaneous methods risk sural nerve injury. The Achillon mini-incision technique can reduce these risks and may provide the opportunity for early active rehabilitation. The aim of this study was to compare the strength of the Achillon method with the commonly used Kessler method and to assess whether the strength of the repair was related to tendon diameter. MATERIALS AND METHODS: Simulated ruptures in sheep Achilles tendons were repaired using either the Achillon method or a two-strand Kessler technique with a No. 2 Ticron suture (Tyco Healthcare, UK). Each tendon diameter was measured, and matched for both groups. Specimens were loaded to failure using an Instron tensile testing machine (Instron Limited, UK). RESULTS: Mean load to failure for the Achillon repair was 153 N+/-60 (range, 65 to 270), and the mean load to failure for the Kessler Repair was 123 N+/-24 (range, 75 to 150). This difference was not statistically significant (p=0.21). There was a statistically significant higher mean load to failure for wider tendons repaired by the Achillon method (p=0.05), however mean load to failure was not related to tendon width in Kessler repairs (p=0.23). CONCLUSION: This is the first study to compare these two methods of repair. The Achillon repair has comparable tensile strength to the Kessler Repair. CLINICAL RELEVANCE: The Achillon repair appears to be a biomechanically sound method of repair for the acutely ruptured Achilles tendon.

Journal article

Amis AA, Cuomo P, Rama RBS, Giron F, Bull AMJ, Thomas R, Aglietti Pet al., 2008, Measurement of Knee Laxity and Pivot-Shift Kinematics With Magnetic Sensors, Operative Techniques in Orthopaedics, Vol: 18, Pages: 196-203, ISSN: 1048-6666

This article describes work to develop a system to measure translational and rotational knee laxity and complex "dynamic" tests, such as the pivot-shift test, by the use of electromagnetic sensors mounted onto the limb segments with specially developed splints and clamps. We have measured in vitro and in vivo the motion of bone-mounted sensors versus skin-mounted sensors, and thus shown that there was an overall accuracy of approximately ±1 mm in translation and ±1° in rotation when the movements were relatively slow. It was found that, for clinical pivot-shift testing, the dynamic motion led to inaccuracy because of the inertia of the sensor mounting system, which led to the peaks of the sudden reduction motions not being measured; this system requires further development. We show that it also is possible to use this system in the clinic to record both rotational and translational knee laxity motions, both of which are integral to the pivot-shift instability. The force and torque were applied to the limb with sets of constant-force springs, which allowed the knee to be flexed while maintaining a constant load across the knee. This maneuver led to graphs showing the limits of translation and rotation laxity, across the range of knee flexion, for a series of 60 patients. It was then shown that the pivot-shift motion occurred within these laxity limits. The level of measurement accuracy means that the system described should be clinically useful. © 2008 Elsevier Inc. All rights reserved.

Journal article

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