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

408 results found

Hoogeslag RAG, Brouwer RW, Huis In 't Veld R, Stephen JM, Amis AAet al., 2018, Dynamic augmentation restores anterior tibial translation in ACL suture repair: a biomechanical comparison of non-, static and dynamic augmentation techniques., Knee Surg Sports Traumatol Arthrosc

PURPOSE: There is a lack of objective evidence investigating how previous non-augmented ACL suture repair techniques and contemporary augmentation techniques in ACL suture repair restrain anterior tibial translation (ATT) across the arc of flexion, and after cyclic loading of the knee. The purpose of this work was to test the null hypotheses that there would be no statistically significant difference in ATT after non-, static- and dynamic-augmented ACL suture repair, and they will not restore ATT to normal values across the arc of flexion of the knee after cyclic loading. METHODS: Eleven human cadaveric knees were mounted in a test rig, and knee kinematics from 0° to 90° of flexion were recorded by use of an optical tracking system. Measurements were recorded without load and with 89-N tibial anterior force. The knees were tested in the following states: ACL-intact, ACL-deficient, non-augmented suture repair, static tape augmentation and dynamic augmentation after 10 and 300 loading cycles. RESULTS: Only static tape augmentation and dynamic augmentation restored ATT to values similar to the ACL-intact state directly postoperation, and maintained this after cyclic loading. However, contrary to dynamic augmentation, the ATT after static tape augmentation failed to remain statistically less than for the ACL-deficient state after cyclic loading. Moreover, after cyclic loading, ATT was significantly less with dynamic augmentation when compared to static tape augmentation. CONCLUSION: In contrast to non-augmented ACL suture repair and static tape augmentation, only dynamic augmentation resulted in restoration of ATT values similar to the ACL-intact knee and decreased ATT values when compared to the ACL-deficient knee immediately post-operation and also after cyclic loading, across the arc of flexion, thus allowing the null hypotheses to be rejected. This may assist healing of the ruptured ACL. Therefore, this study would support further clinical evaluation of dyna

JOURNAL ARTICLE

Kanca Y, Milner P, Dini D, Amis AAet al., 2018, Tribological properties of PVA/PVP blend hydrogels against articular cartilage, JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, Vol: 78, Pages: 36-45, ISSN: 1751-6161

JOURNAL ARTICLE

Kittl C, Inderhaug E, Williams A, Amis AAet al., 2018, Biomechanics of the Anterolateral Structures of the Knee, CLINICS IN SPORTS MEDICINE, Vol: 37, Pages: 21-+, ISSN: 0278-5919

JOURNAL ARTICLE

Musahl V, Getgood A, Neyret P, Claes S, Burnham JM, Batailler C, Sonnery-Cottet B, Williams A, Amis A, Zaffagnini S, Karlsson Jet al., 2018, Erratum to: Contributions of the anterolateral complex and the anterolateral ligament to rotatory knee stability in the setting of ACL Injury: a roundtable discussion (Knee Surgery, Sports Traumatology, Arthroscopy, (2017), 25, 4, (997-1008), 10.1007/s00167-017-4436-7), Knee Surgery, Sports Traumatology, Arthroscopy, Vol: 26, ISSN: 0942-2056

© 2016, European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA). In the original article, one of the co-authors’ name has been published incorrectly. The correct name should be Jeremy M. Burnham. The original article has been updated accordingly.

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 A, Zaffagnini S, Musahl V, 2017, The anterolateral aspect of the knee: the state of play., Knee Surg Sports Traumatol Arthrosc, Vol: 25, Pages: 989-990

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, JOURNAL OF ORTHOPAEDIC RESEARCH, Vol: 35, Pages: 2765-2772, ISSN: 0736-0266

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

Inderhaug E, Stephen JM, Williams A, Amis AAet al., 2017, Anterolateral Tenodesis or Anterolateral Ligament Complex Reconstruction Effect of Flexion Angle at Graft Fixation When Combined With ACL Reconstruction, AMERICAN JOURNAL OF SPORTS MEDICINE, Vol: 45, Pages: 3089-3097, 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

Kittl C, Inderhaug E, Stephen J, El-Daou H, Williams A, Amis AAet al., 2017, Scientific basis and surgical technique for iliotibial band tenodesis combined with ACL reconstruction, Controversies in the Technical Aspects of ACL Reconstruction: An Evidence-Based Medicine Approach, Pages: 393-404, ISBN: 9783662527429

© ISAKOS 2017. Anatomy: Due to the complexity of the lateral side of the knee, it may be best to describe these structures in terms of three tissue layers from superficial to deep. The distal part of the fascia lata - (1) the superficial layer of the iliotibial band (ITB) - is tethered to the distal femur by the (2) deep and capsulo-osseous fibres of the ITB. Removal of these ITB layers exposes the (3) anterolateral capsule and other deeper structures, which has been described as including the anterolateral ligament (ALL) with differing interpretations. Biomechanics: The anterior cruciate ligament (ACL) and the ITB have been shown to be the primary restraints to anterior tibial translation and internal tibial rotation, respectively. An injury of the ACL and the anterolateral structures may therefore result in a combined translatory and rotatory instability, called anterolateral rotatory instability (ALRI). As a logical rationale, a surgical intervention would include an intra-articular ACL reconstruction alongside a reconstruction of the anterolateral structures. This has been shown to restore normal knee kinematics in a simulated ALRI-injured knee. Conclusion: The anatomy of the anterolateral side is complex and yet not fully understood. Thus, there is an urgent need for a standardised nomenclature/terminology for these structures. A combined ALRI injury may be treated with an intra-articular ACL reconstruction and a nonanatomic ITB tenodesis.

BOOK CHAPTER

Kittl C, Williams A, Amis AA, 2017, Biomechanical Role of Lateral Structures in Controlling Anterolateral Rotatory Laxity: The lliotibial Tract, OPERATIVE TECHNIQUES IN ORTHOPAEDICS, Vol: 27, Pages: 96-101, ISSN: 1048-6666

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

Musahl V, Getgood A, Neyret P, Claes S, Burnham JM, Batailler C, Sonnery-Cottet B, Williams A, Amis A, Zaffagnini S, Karlsson Jet al., 2017, Contributions of the anterolateral complex and the anterolateral ligament to rotatory knee stability in the setting of ACL Injury: a roundtable discussion., Knee Surg Sports Traumatol Arthrosc, Vol: 25, Pages: 997-1008

Persistent rotatory knee laxity is increasingly recognized as a common finding after anterior cruciate ligament (ACL) reconstruction. While the reasons behind rotator knee laxity are multifactorial, the impact of the anterolateral knee structures is significant. As such, substantial focus has been directed toward better understanding these structures, including their anatomy, biomechanics, in vivo function, injury patterns, and the ideal procedures with which to address any rotatory knee laxity that results from damage to these structures. However, the complexity of lateral knee anatomy, varying dissection techniques, differing specimen preparation methods, inconsistent sectioning techniques in biomechanical studies, and confusing terminology have led to discrepancies in published studies on the topic. Furthermore, anatomical and functional descriptions have varied widely. As such, we have assembled a panel of expert surgeons and scientists to discuss the roles of the anterolateral structures in rotatory knee laxity, the healing potential of these structures, the most appropriate procedures to address rotatory knee laxity, and the indications for these procedures. In this round table discussion, KSSTA Editor-in-Chief Professor Jón Karlsson poses a variety of relevant and timely questions, and experts from around the world provide answers based on their personal experiences, scientific study, and interpretations of the literature. Level of evidence V.

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

Williams A, Ball S, Stephen J, White N, Jones M, Amis Aet al., 2017, The scientific rationale for lateral tenodesis augmentation of intra-articular ACL reconstruction using a modified 'Lemaire' procedure, KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 25, Pages: 1339-1344, ISSN: 0942-2056

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

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