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  • Book chapter
    Masouros S, Halewood C, Bull A, Amis Aet al., 2015,

    Biomechanics

    , Expertise orthopadie und unfallchirurgie: Knie, Editors: Kohn, ISBN: 978-3-1317500-1-3
  • Conference paper
    Geraldes D, Hansen U, Amis A, 2015,

    An automated framework for parametric analysis glenoid implant design

    , Bath Biomechanics Symposium 2015
  • Conference paper
    Geraldes D, Hansen U, Amis A, 2015,

    Parametric analysis of glenoid implant design

    , International Society of Biomechanics 2015
  • Journal article
    Stephen JM, Dodds AL, Lumpaopong P, Kader D, Williams A, Amis AAet al., 2015,

    The Ability of Medial Patellofemoral Ligament Reconstruction to Correct Patellar Kinematics and Contact Mechanics in the Presence of a Lateralized Tibial Tubercle

    , AMERICAN JOURNAL OF SPORTS MEDICINE, Vol: 43, Pages: 2198-2207, ISSN: 0363-5465
  • Journal article
    Aqil A, Sheikh HQ, Masjedi M, Jeffers J, Cobb Jet al., 2015,

    Birmingham Mid-Head Resection Periprosthetic Fracture.

    , Clin Orthop Surg, Vol: 7, Pages: 402-405

    Total hip arthroplasty in the young leads to difficult choices in implant selection. Until recently bone conserving options were not available for younger patients with deficient femoral head bone stock. The novel Birmingham Mid-Head Resection (BMHR) device offers the option of bone conserving arthroplasty in spite of deficient femoral head bone stock. Femoral neck fracture is a known complication of standard resurfacing arthroplasty and is the most common reason for revision. It is unknown whether this remains to be the case for the BMHR neck preserving implants. We report a case of a 57-year-old male, who sustained a periprosthetic fracture following surgery with a BMHR arthroplasty. This paper illustrates the first reported case of a BMHR periprosthetic fracture. The fracture pattern is spiral in nature and reaches to the subtrochanteric area. This fracture pattern is different from published cadaveric studies, and clinicians using this implant should be aware of this as revision is likely to require a distally fitting, rather than a metaphyseal fitting stem. We have illustrated the surgical technique to manage this rare complication.

  • Journal article
    Kittl C, Schmeling A, Amis AA, 2015,

    The patellofemoral joint. Anatomy, biomechanics, and surgical interventions

    , ARTHROSKOPIE, Vol: 28, Pages: 172-180, ISSN: 0933-7946
  • Journal article
    Tuncer M, Patel R, Cobb JP, Hansen UN, Amis AAet al., 2015,

    Variable bone mineral density reductions post-unicompartmental knee arthroplasty

    , KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 23, Pages: 2230-2236, ISSN: 0942-2056
  • Journal article
    Simpson RL, Nazhat SN, Blaker JJ, Bismarck A, Hill R, Boccaccini AR, Hansen UN, Amis AAet al., 2015,

    A comparative study of the effects of different bioactive fillers in PLGA matrix composites and their suitability as bone substitute materials: A thermo-mechanical and in vitro investigation.

    , Journal of the Mechanical Behavior of Biomedical Materials, Vol: 50, Pages: 277-289, ISSN: 1751-6161

    Bone substitute composite materials with poly(L-lactide-co-glycolide) (PLGA) matrices and four different bioactive fillers: CaCO3, hydroxyapatite (HA), 45S5 Bioglass(®) (45S5 BG), and ICIE4 bioactive glass (a lower sodium glass than 45S5 BG) were produced via melt blending, extrusion and moulding. The viscoelastic, mechanical and thermal properties, and the molecular weight of the matrix were measured. Thermogravimetric analysis evaluated the effect of filler composition on the thermal degradation of the matrix. Bioactive glasses caused premature degradation of the matrix during processing, whereas CaCO3 or HA did not. All composites, except those with 45S5 BG, had similar mechanical strength and were stiffer than PLGA alone in compression, whilst all had a lower tensile strength. Dynamic mechanical analysis demonstrated an increased storage modulus (E') in the composites (other than the 45S5 BG filled PLGA). The effect of water uptake and early degradation was investigated by short-term in vitro aging in simulated body fluid, which indicated enhanced water uptake over the neat polymer; bioactive glass had the greatest water uptake, causing matrix plasticization. These results enable a direct comparison between bioactive filler type in poly(α-hydroxyester) composites, and have implications when selecting a composite material for eventual application in bone substitution.

  • Journal article
    Halewood C, Traynor A, Bellemans J, Victor J, Amis AAet al., 2015,

    Anteroposterior Laxity After Bicruciate-Retaining Total Knee Arthroplasty Is Closer to the Native Knee Than ACL-Resecting TKA: A Biomechanical Cadaver Study.

    , Journal of Arthroplasty, ISSN: 1532-8406

    The purpose of this study was to examine whether a bicruciate retaining (BCR) TKA would yield anteroposterior (AP) laxity closer to the native knee than a posterior cruciate ligament retaining (CR) TKA. A BCR TKA was designed and compared to CR TKA and the native knee using cadaver specimens. AP laxity with the CR TKA was greater than the native knee (P=0.006) and BCR TKA (P=0.039), but no difference was found between the BCR TKA and the native knee. No significant differences were found in rotations between the prostheses and the native knee. BCR TKA was shown to be surgically feasible, reduced AP laxity versus CR TKA, and may improve knee stability without using conforming geometry in the implant design.

  • Journal article
    Ghosh KM, Hunt N, Blain A, Athwal KK, Longstaff L, Amis AA, Rushton S, Deehan DJet al., 2015,

    Isolated popliteus tendon injury does not lead to abnormal laxity in posterior-stabilised total knee arthroplasty

    , KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 23, Pages: 1763-1769, ISSN: 0942-2056
  • Journal article
    Sukjamsri, Amis, Hansen UN, 2015,

    Digital volume correlation and micro-CT: An in-vitro technique for measuring full-field interface micromotion around polyethylene implants

    , Journal of Biomechanics, ISSN: 1873-2380
  • Journal article
    Hansen UN, sukjamsri, amis, 2015,

    Digital volumecorrelationandmicro-CT:Anin-vitrotechniquefor measuringfull-field interfacemicromotionaroundpolyethyleneimplants

    , Journal of Biomechanics, ISSN: 1873-2380
  • Book chapter
    Halewood C, Masouros S, Amis AA, 2015,

    Structure and function of the menisci

    , Meniscal Allograft Transplantation. A comprehensive review., Editors: Getgood, Spalding, Cole, Gersoff, Verdonk, ISBN: 978-0-9558873-5-2
  • Book chapter
    Halewood C, Lumpaopong P, Stephen JM, Amis AAet al., 2015,

    Functional Biomechanics with Cadaver Specimens

    , Experimental Research Methods in Orthopedics and Trauma, Editors: Simpson, Augat, Publisher: Thieme Medical Publishers, ISBN: 9783131731111

    This book provides a comprehensive summary of all current research methodologies for translational and pre-clinical studies in biomechanics and orthopedic trauma surgery.

  • Journal article
    Halewood C, Amis AA, 2015,

    Clinically relevant biomechanics of the knee capsule and ligaments

    , Knee Surgery, Sports Traumatology, Arthroscopy, Vol: 23, Pages: 2789-2796, ISSN: 0942-2056

    The paper describes the concepts of primary and secondary restraints to knee joint stability and explains systematically how the tibia is stabilised against translational forces and rotational torques in different directions and axes, and how those vary across the arc of flexion–extension. It also shows how the menisci act to stabilise the knee, in addition to load carrying across the joint. It compares the properties of the natural stabilising structures with the strength and stiffness of autogenous tissue grafts and relates those strengths to the strength of graft fixation devices. A good understanding of the biomechanical behaviour of these various structures in the knee will help the surgeon in the assessment and treatment of single and multi-ligament injuries.

  • Journal article
    van Arkel RJ, Amis AA, Cobb JP, Jeffers JRTet al., 2015,

    The capsular ligaments provide more hip rotational restraint than the acetabular labrum and the ligamentum teres

    , Bone & Joint Journal, Vol: 97B, Pages: 484-491, ISSN: 2049-4394

    In this in vitro study of the hip joint we examined which soft tissues act as primary and secondary passive rotational restraints when the hip joint is functionally loaded. A total of nine cadaveric left hips were mounted in a testing rig that allowed the application of forces, torques and rotations in all six degrees of freedom. The hip was rotated throughout a complete range of movement (ROM) and the contributions of the iliofemoral (medial and lateral arms), pubofemoral and ischiofemoral ligaments and the ligamentum teres to rotational restraint was determined by resecting a ligament and measuring the reduced torque required to achieve the same angular position as before resection. The contribution from the acetabular labrum was also measured. Each of the capsular ligaments acted as the primary hip rotation restraint somewhere within the complete ROM, and the ligamentum teres acted as a secondary restraint in high flexion, adduction and external rotation. The iliofemoral lateral arm and the ischiofemoral ligaments were primary restraints in two-thirds of the positions tested. Appreciation of the importance of these structures in preventing excessive hip rotation and subsequent impingement/instability may be relevant for surgeons undertaking both hip joint preserving surgery and hip arthroplasty.

  • Conference paper
    Stephen JM, Halewood C, Kittl C, Bollen S, Williams A, Amis AAet al., 2015,

    The influence of posterior medial meniscocapsular lesions on tibiofemoral joint laxity in ACL deficient and reconstructed knees

    , British Association of Surgery of the Knee
  • Conference paper
    Halewood C, 2015,

    Anteroposterior laxity after bicruciate-retaining total knee replacement is closer to the intact knee than conventional ACL-resecting TKR: a biomechanical cadaver study

    , BASK
  • Journal article
    Kawaguchi Y, Kondo E, Takeda R, Akita K, Yasuda K, Amis AAet al., 2015,

    The Role of Fibers in the Femoral Attachment of the Anterior Cruciate Ligament in Resisting Tibial Displacement

    , ARTHROSCOPY-THE JOURNAL OF ARTHROSCOPIC AND RELATED SURGERY, Vol: 31, Pages: 435-444, ISSN: 0749-8063
  • Journal article
    Kittl C, Halewood C, Stephen JM, Gupte CM, Weiler A, Williams A, Amis AAet al., 2015,

    Length Change Patterns in the Lateral Extra-articular Structures of the Knee and Related Reconstructions

    , AMERICAN JOURNAL OF SPORTS MEDICINE, Vol: 43, Pages: 354-362, ISSN: 0363-5465

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