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

345 results found

Kittl C, Inderhaug E, Williams A, Amis AAet al., 2018, Biomechanics of the Anterolateral Structures of the Knee., Clin Sports Med, Vol: 37, Pages: 21-31

This article describes the complex anatomic structures that pass across the lateral aspect of the knee, particularly the iliotibial tract and the underlying anterolateral ligament and capsule. It provides data on their strength and roles in controlling tibiofemoral joint laxity and stability. These findings are discussed in relation to surgery to repair or reconstruct the anatomic structures, or to create tenodeses with similar effect.

JOURNAL ARTICLE

Amirthanayagam TD, Amis AA, Reilly P, Emery RJHet al., 2017, Rotator cuff-sparing approaches for glenohumeral joint access: an anatomic feasibility study, JOURNAL OF SHOULDER AND ELBOW SURGERY, Vol: 26, Pages: 512-520, ISSN: 1058-2746

JOURNAL ARTICLE

Amis AA, 2017, Anterolateral knee biomechanics, KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 25, Pages: 1015-1023, ISSN: 0942-2056

JOURNAL ARTICLE

Athwal KK, El Daou H, Inderhaug E, Manning W, Davies AJ, Deehan DJ, Amis AAet al., 2017, An in vitro analysis of medial structures and a medial soft tissue reconstruction in a constrained condylar total knee arthroplasty, KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 25, Pages: 2646-2655, ISSN: 0942-2056

JOURNAL ARTICLE

Athwal KK, El Daou H, Inderhaug E, Manning W, Davies AJ, Deehan DJ, Amis AAet al., 2017, An in vitro analysis of medial structures and a medial soft tissue reconstruction in a constrained condylar total knee arthroplasty (vol 25, pg 2646, 2016), KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 25, Pages: 2656-2656, ISSN: 0942-2056

JOURNAL ARTICLE

Athwal KK, El Daou H, Lord B, Davies AJ, Manning W, Rodriguez y Baena F, Deehan DJ, Amis AAet al., 2017, Lateral soft-tissue structures contribute to cruciate-retaining total knee arthroplasty stability, JOURNAL OF ORTHOPAEDIC RESEARCH, Vol: 35, Pages: 1902-1909, ISSN: 0736-0266

JOURNAL ARTICLE

Cheong VS, Karunaratne A, Amis AA, Bull AMJet al., 2017, Strain rate dependency of fractures of immature bone, JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, Vol: 66, Pages: 68-76, ISSN: 1751-6161

JOURNAL ARTICLE

Colaco HB, Lord BR, Back DL, Davies AJ, Amis AA, Ajuied Aet al., 2017, Biomechanical properties of bovine tendon xenografts treated with a modern processing method, JOURNAL OF BIOMECHANICS, Vol: 53, Pages: 144-147, ISSN: 0021-9290

JOURNAL ARTICLE

El Daou H, Lord B, Amis A, Rodriguez y Baena Fet al., 2017, Assessment of pose repeatability and specimen repositioning of a robotic joint testing platform, MEDICAL ENGINEERING & PHYSICS, Vol: 47, Pages: 210-213, ISSN: 1350-4533

JOURNAL ARTICLE

Geraldes DM, Hansen U, Amis AA, 2017, Parametric Analysis of Glenoid Implant Design and Fixation Type, JOURNAL OF ORTHOPAEDIC RESEARCH, Vol: 35, Pages: 775-784, ISSN: 0736-0266

JOURNAL ARTICLE

Geraldes DM, Hansen U, Jeffers J, Amis AAet al., 2017, Stability of small pegs for cementless implant fixation., J Orthop Res

Most glenoid implants rely on large centrally located fixation features to avoid perforation of the glenoid vault in its peripheral regions. Upon revision of such components there may not be enough bone left for the reinsertion of an anatomical prosthesis. Multiple press-fit small pegs would allow for less bone resection and strong anchoring in the stiffer and denser peripheral subchondral bone. This study assessed the fixation characteristics, measured as the push-in (Pin ) and pull-out (Pout ) forces, and spring-back, measured as the elastic displacement immediately after insertion, for five different small press-fitted peg configurations manufactured out of UHMWPE cylinders (5 mm diameter and length). A total of 16 specimens for each configuration were tested in two types of solid bone substitute: Hard (40 PCF, 0.64 g/cm3 , worst-case scenario of Pin ) and soft (15 PCF, 0.24 g/cm3 , worst-case scenario of spring-back and Pout ). Two different diametric interference-fits were studied. Geometries with lower stiffness fins (large length to width aspect ratio) were the best performing designs in terms of primary fixation stability. They required the lowest force to fully seat, meaning they are less damaging to the bone during implantation, while providing the highest Pout /Pin ratio, indicating that when implanted they provide the strongest anchoring for the glenoid component. It is highlighted that drilling of chamfered holes could minimize spring-back displacements. These findings are relevant for the design of implants press-fitted pegs because primary fixation has been shown to be an important factor in achieving osseointegration and longevity of secondary fixation. © 2017 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res.

JOURNAL ARTICLE

Inderhaug E, Stephen JM, El-Daou H, Williams A, Amis AAet al., 2017, The Effects of Anterolateral Tenodesis on Tibiofemoral Contact Pressures and Kinematics, AMERICAN JOURNAL OF SPORTS MEDICINE, Vol: 45, Pages: 3081-3088, ISSN: 0363-5465

JOURNAL ARTICLE

Inderhaug E, Stephen JM, Williams A, Amis AAet al., 2017, Biomechanical Comparison of Anterolateral Procedures Combined With Anterior Cruciate Ligament Reconstruction, AMERICAN JOURNAL OF SPORTS MEDICINE, Vol: 45, Pages: 347-354, ISSN: 0363-5465

JOURNAL ARTICLE

Iranpour F, Merican AM, Teo SH, Cobb JP, Amis AAet al., 2017, Femoral articular geometry and patellofemoral stability, KNEE, Vol: 24, Pages: 555-563, ISSN: 0968-0160

JOURNAL ARTICLE

Junaid S, Sanghavi S, Anglin C, Bull A, Emery R, Amis AA, Hansen Uet al., 2017, Treatment of the Fixation Surface Improves Glenoid Prosthesis Longevity in vitro, JOURNAL OF BIOMECHANICS, Vol: 61, Pages: 81-87, ISSN: 0021-9290

JOURNAL ARTICLE

Kanca Y, Milner P, Dini D, Amis AAet al., 2017, Tribological properties of PVA/PVP blend hydrogels against articular cartilage., J Mech Behav Biomed Mater, Vol: 78, Pages: 36-45

This research investigated in-vitro tribological performance of the articulation of cartilage-on- polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP) blend hydrogels using a custom-designed multi-directional wear rig. The hydrogels were prepared by repeated freezing-thawing cycles at different concentrations and PVA to PVP fractions at a given concentration. PVA/PVP blend hydrogels showed low coefficient of friction (COF) values (between 0.12 ± 0.01 and 0.14 ± 0.02) which were closer to the cartilage-on-cartilage articulation (0.03 ± 0.01) compared to the cartilage-on-stainless steel articulation (0.46 ± 0.06). The COF increased with increasing hydrogel concentration (p = 0.03) and decreasing PVP content at a given concentration (p < 0.05). The cartilage-on-hydrogel tests showed only the surface layers of the cartilage being removed (average volume loss of the condyles was 12.5 ± 4.2mm3). However, the hydrogels were found to be worn/deformed. The hydrogels prepared at a higher concentration showed lower apparent volume loss. A strong correlation (R2 = 0.94) was found between the COF and compressive moduli of the hydrogel groups, resulting from decreasing contact congruency. It was concluded that the hydrogels were promising as hemiarthroplasty materials, but that improved mechanical behaviour was required for clinical use.

JOURNAL ARTICLE

Li J, Clarke S, Cobb JP, Amis AAet al., 2017, Novel curved surface preparation technique for knee resurfacing, MEDICAL ENGINEERING & PHYSICS, Vol: 49, Pages: 89-93, ISSN: 1350-4533

JOURNAL ARTICLE

Lord BR, El-Daou H, Sabnis BM, Gupte CM, Wilson AJ, Amis AAet al., 2017, Biomechanical comparison of graft structures in anterior cruciate ligament reconstruction (vol 25, pg 559, 2017), KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 25, Pages: 988-988, ISSN: 0942-2056

JOURNAL ARTICLE

Lord BR, El-Daou H, Sabnis BM, Gupte CM, Wilson AM, Amis AAet al., 2017, Biomechanical comparison of graft structures in anterior cruciate ligament reconstruction, KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 25, Pages: 559-568, ISSN: 0942-2056

JOURNAL ARTICLE

Sopher RS, Amis AA, Calder JD, Jeffers JRTet al., 2017, Total ankle replacement design and positioning affect implant-bone micromotion and bone strains, MEDICAL ENGINEERING & PHYSICS, Vol: 42, Pages: 80-90, ISSN: 1350-4533

JOURNAL ARTICLE

Sopher RS, Amis AA, Davies DC, Jeffers JRTet al., 2017, The influence of muscle pennation angle and cross-sectional area on contact forces in the ankle joint, JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN, Vol: 52, Pages: 12-23, ISSN: 0309-3247

JOURNAL ARTICLE

van Arkel RJ, Jeffers JRT, Amis AA, 2017, Editorial Commentary: Anatomical Vandalism of the Hip? Hip Capsular Repair Seems a Sound Adjunct to Hip Arthroscopic Surgery, ARTHROSCOPY-THE JOURNAL OF ARTHROSCOPIC AND RELATED SURGERY, Vol: 33, Pages: 314-316, ISSN: 0749-8063

JOURNAL ARTICLE

Athwal KK, El Daou H, Kittl C, Davies AJ, Deehan DJ, Amis AAet al., 2016, The superficial medial collateral ligament is the primary medial restraint to knee laxity after cruciate-retaining or posterior-stabilised total knee arthroplasty: effects of implant type and partial release, KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 24, Pages: 2646-2655, ISSN: 0942-2056

JOURNAL ARTICLE

Chong DYR, Hansen UN, Amis AA, 2016, CEMENTLESS MIS MINI-KEEL PROSTHESIS REDUCES INTERFACE MICROMOTION VERSUS STANDARD STEMMED TIBIAL COMPONENTS, JOURNAL OF MECHANICS IN MEDICINE AND BIOLOGY, Vol: 16, ISSN: 0219-5194

JOURNAL ARTICLE

Geraldes D, Hansen U, Jeffers J, Amis Aet al., 2016, Interference fit optimisation for small press-fitted pegs, International Society for Technology in Arthroplasty 2015, Publisher: BRITISH EDITORIAL SOCIETY OF BONE & JOINT SURGERY, Pages: 150-150, ISSN: 2049-4416

CONFERENCE PAPER

Ghosh KM, Manning WA, Blain AP, Rushton SP, Longstaff LM, Amis AA, Deehan DJet al., 2016, Influence of increasing construct constraint in the presence of posterolateral deficiency at knee replacement: A biomechanical study, JOURNAL OF ORTHOPAEDIC RESEARCH, Vol: 34, Pages: 427-434, ISSN: 0736-0266

JOURNAL ARTICLE

Kittl C, El-Daou H, Athwal KK, Gupte CM, Weiler A, Williams A, Amis AAet al., 2016, The Role of the Anterolateral Structures and the ACL in Controlling Laxity of the Intact and ACL-Deficient Knee, AMERICAN JOURNAL OF SPORTS MEDICINE, Vol: 44, Pages: 345-354, ISSN: 0363-5465

JOURNAL ARTICLE

Kittl C, El-Daou H, Athwal KK, Gupte CM, Weiler A, Williams A, Amis AAet al., 2016, The Role of the Anterolateral Structures and the ACL in Controlling Laxity of the Intact and ACL-Deficient Knee: Response, AMERICAN JOURNAL OF SPORTS MEDICINE, Vol: 44, Pages: NP15-NP18, ISSN: 0363-5465

JOURNAL ARTICLE

Stephen JM, Halewood C, Kittl C, Bollen SR, Williams A, Amis AAet al., 2016, Posteromedial Meniscocapsular Lesions Increase Tibiofemoral Joint Laxity With Anterior Cruciate Ligament Deficiency, and Their Repair Reduces Laxity, AMERICAN JOURNAL OF SPORTS MEDICINE, Vol: 44, Pages: 400-408, ISSN: 0363-5465

JOURNAL ARTICLE

Stephen JM, Kittl C, Williams A, Zaffagnini S, Muccioli GMM, Fink C, Amis AAet al., 2016, Effect of Medial Patellofemoral Ligament Reconstruction Method on Patellofemoral Contact Pressures and Kinematics, AMERICAN JOURNAL OF SPORTS MEDICINE, Vol: 44, Pages: 1186-1194, ISSN: 0363-5465

JOURNAL ARTICLE

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