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  • JOURNAL ARTICLE
    Athwal KK, Milner PE, Bellier G, Amis AAet al., 2018,

    Posterior capsular release is a biomechanically safe procedure to perform in total knee arthroplasty.

    , Knee Surg Sports Traumatol Arthrosc

    PURPOSE: Surgeons may attempt to strip the posterior capsule from its femoral attachment to overcome flexion contracture in total knee arthroplasty (TKA); however, it is unclear if this impacts anterior-posterior (AP) laxity of the implanted knee. The aim of the study was to investigate the effect of posterior capsular release on AP laxity in TKA, and compare this to the restraint from the posterior cruciate ligament (PCL). METHODS: Eight cadaveric knees were mounted in a six degree of freedom testing rig and tested at 0°, 30°, 60° and 90° flexion with ± 150 N AP force, with and without a 710 N axial compressive load. After the native knee was tested, a deep dished cruciate-retaining TKA was implanted and the tests were repeated. The PCL was then cut, followed by releasing the posterior capsule using a curved osteotome. RESULTS: With 0 N axial load applied, cutting the PCL as well as releasing the posterior capsule significantly increased posterior laxity compared to the native knee at all flexion angles, and CR TKA states at 30°, 60° and 90° (p < 0.05). However, no significant increase in laxity was found between cutting the PCL and subsequent PostCap release (n.s.). In anterior drawer, there was a significant increase of 1.4 mm between cutting the PCL and PostCap release at 0°, but not at any other flexion angles (p = 0.021). When a 710 N axial load was applied, there was no significant difference in anterior or posterior translation across the different knee states (n.s.). CONCLUSIONS: Posterior capsular release only caused a small change in AP laxity compared to cutting the PCL and, therefore, may not be considered detrimental to overall AP stability if performed during TKA surgery. LEVEL OF EVIDENCE: Controlled laboratory study.

  • JOURNAL ARTICLE
    Doyle R, Boughton O, Plant D, DeSoutter G, Cobb J, Jeffers Jet al., 2018,

    An in vitro model of impaction during hip arthroplasty

    , Journal of Biomechanics, ISSN: 0021-9290
  • JOURNAL ARTICLE
    El Daou H, Ng KCG, Van Arkel R, Jeffers JRT, Rodriguez Y Baena Fet al., 2018,

    Robotic hip joint testing: Development and experimental protocols.

    , Med Eng Phys

    The use of robotic systems combined with force sensing is emerging as the gold standard for in vitro biomechanical joint testing, due to the advantage of controlling all six degrees of freedom independently of one another. This paper describes a novel robotic platform and the experimental protocol used for hip joint testing. An experimental protocol implemented optical tracking and registration techniques in order to define the position of the hip joint centre of rotation (COR) in the coordinate system of the robot's end effector. The COR coordinates defined the origin of the task-related coordinate system used to control the robot, with a hybrid force/position law to simulate standard clinical tests. The axes of this frame were defined using the International Society of Biomechanics (ISB) anatomical coordinate system. Experiments were carried out on two cadaveric hip joint specimens using the robotic testing platform and a mechanical testing rig previously developed and described by our group. Simulated internal-external and adduction/abduction laxity tests were carried out with both systems and the resulting peak range of motion (ROM) was measured. Similarities and differences were observed in these experiments, which were used to highlight some of the limitations of conventional systems and the corresponding advantages of robotics, further emphasising their added value in vitro testing.

  • JOURNAL ARTICLE
    Getgood A, Brown C, Lording T, Amis A, Claes S, Geeslin A, Musahl V, Amis A, Brown C, Cavaignac E, Claes S, Daggett M, Dejour D, Engebretsen L, Feng H, Fleming B, Fu F, Geeslin A, Getgood A, Guenther D, Helito CP, Herbst E, Inderhaug E, Karlsson J, Kittl C, Kuroda R, LaPrade R, Landreau P, Lording T, Mueller W, Musahl V, Neyret P, Noyes F, Pearle A, Saithna A, Smigielski R, Sonnery-Cottet B, Spalding T, Van Dyck P, Verdonk P, Williams A, Wilson A, Zaffagnini Set al., 2018,

    The anterolateral complex of the knee: results from the International ALC Consensus Group Meeting

    , Knee Surgery, Sports Traumatology, Arthroscopy, ISSN: 0942-2056

    © 2018, European Society of Sports Traumatology, Knee Surgery, Arthroscopy (ESSKA). The structure and function of the anterolateral complex (ALC) of the knee has created much controversy since the ‘re-discovery’ of the anterolateral ligament (ALL) and its proposed role in aiding control of anterolateral rotatory laxity in the anterior cruciate ligament (ACL) injured knee. A group of surgeons and researchers prominent in the field gathered to produce consensus as to the anatomy and biomechanical properties of the ALC. The evidence for and against utilisation of ALC reconstruction was also discussed, generating a number of consensus statements by following a modified Delphi process. Key points include that the ALC consists of the superficial and deep aspects of the iliotibial tract with its Kaplan fibre attachments on the distal femur, along with the ALL, a capsular structure within the anterolateral capsule. A number of structures attach to the area of the Segond fracture including the capsule-osseous layer of the iliotibial band, the ALL and the anterior arm of the short head of biceps, and hence it is not clear which is responsible for this lesion. The ALC functions to provide anterolateral rotatory stability as a secondary stabiliser to the ACL. Whilst biomechanical studies have shown that these structures play an important role in controlling stability at the time of ACL reconstruction, the optimal surgical procedure has not yet been defined clinically. Concern remains that these procedures may cause constraint of motion, yet no clinical studies have demonstrated an increased risk of osteoarthritis development. Furthermore, clinical evidence is currently lacking to support clear indications for lateral extra-articular procedures as an augmentation to ACL reconstruction. The resulting statements and scientific rationale aim to inform readers on the most current thinking and identify areas of needed basic science and clinical research to help impro

  • JOURNAL ARTICLE
    Ghouse S, Babu S, Nai K, Hooper PA, Jeffers JRTet al., 2018,

    The influence of laser parameters, scanning strategies and material on the fatigue strength of a stochastic porous structure

    , ADDITIVE MANUFACTURING, Vol: 22, Pages: 290-301, ISSN: 2214-8604
  • JOURNAL ARTICLE
    Halewood C, Athwal KK, Amis AA, 2018,

    Pre-clinical assessment of total knee replacement anterior-posterior constraint

    , JOURNAL OF BIOMECHANICS, Vol: 73, Pages: 153-160, ISSN: 0021-9290
  • JOURNAL ARTICLE
    Han S, Alexander JW, Thomas VS, Choi J, Harris JD, Doherty DB, Jeffers JRT, Noble PCet al., 2018,

    Does Capsular Laxity Lead to Microinstability of the Native Hip?

    , AMERICAN JOURNAL OF SPORTS MEDICINE, Vol: 46, Pages: 1315-1323, ISSN: 0363-5465
  • JOURNAL ARTICLE
    Heilpern G, Stephen J, Ball S, Amis A, Williams Aet al., 2018,

    It is safe and effective to use all inside meniscal repair devices for posteromedial meniscal 'ramp' lesions

    , KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 26, Pages: 2310-2316, ISSN: 0942-2056
  • JOURNAL ARTICLE
    Hoogeslag RAG, Brouwer RW, in't Veld RH, 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 SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 26, Pages: 2986-2996, ISSN: 0942-2056
  • JOURNAL ARTICLE
    Inderhaug E, Stephen JM, Williams A, Amis AAet al., 2018,

    Effect of Anterolateral Complex Sectioning and Tenodesis on Patellar Kinematics and Patellofemoral Joint Contact Pressures

    , AMERICAN JOURNAL OF SPORTS MEDICINE, Vol: 46, Pages: 2922-2928, ISSN: 0363-5465
  • JOURNAL ARTICLE
    Junaid S, Gregory T, Fetherston S, Emery R, Amis AA, Hansen Uet al., 2018,

    Cadaveric study validating in vitro monitoring techniques to measure the failure mechanism of glenoid implants against clinical CT

    , JOURNAL OF ORTHOPAEDIC RESEARCH, Vol: 36, Pages: 2524-2532, ISSN: 0736-0266
  • 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
    Kanca Y, Milner P, Dini D, Amis AAet al., 2018,

    Tribological evaluation of biomedical polycarbonate urethanes against articular cartilage

    , JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS, Vol: 82, Pages: 394-402, 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
    Lord BR, Colaco HB, Gupte CM, Wilson AJ, Amis AAet al., 2018,

    ACL graft compression: a method to allow reduced tunnel sizes in ACL reconstruction

    , KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 26, Pages: 2430-2437, ISSN: 0942-2056
  • JOURNAL ARTICLE
    Marsland D, Stephen JM, Calder T, Amis AA, Calder JDFet al., 2018,

    Strength of Interference Screw Fixation to Cuboid vs Pulvertaft Weave to Peroneus Brevis for Tibialis Posterior Tendon Transfer for Foot Drop

    , FOOT & ANKLE INTERNATIONAL, Vol: 39, Pages: 858-864, ISSN: 1071-1007
  • JOURNAL ARTICLE
    Marsland D, Stephen JM, Calder T, Amis AA, Calder JDFet al., 2018,

    Flexor digitorum longus tendon transfer to the navicular: tendon-to-tendon repair is stronger compared with interference screw fixation.

    , Knee Surg Sports Traumatol Arthrosc

    PURPOSE: To assess whether early rehabilitation could be safe after flexor digitorum longus (FDL) tendon transfer, the current biomechanical study aimed to measure tendon displacement under cyclic loading and load to failure, comparing a traditional tendon-to-tendon (TT) repair with interference screw fixation (ISF). METHODS: 24 fresh-frozen cadaveric below knee specimens underwent FDL tendon transfer. In 12 specimens a TT repair was performed via a navicular bone tunnel. In a further 12 specimens ISF was performed. Using a materials testing machine, the FDL tendon was cycled 1000 times to 150 N and tendon displacement at the insertion site measured. A final load to failure test was then performed. Statistical analysis was performed using two-way ANOVA and an independent t test, with a significance level of p < 0.05. RESULT: No significant difference in tendon displacement occurred after cyclic loading, with mean tendon displacements of 1.9 ± 1.2 mm (mean ± SD) in the TT group and 1.8 ± 1.5 mm in the ISF group (n.s.). Two early failures occurred in the ISF group, none in the TT group. Mean load to failure was significantly greater following TT repair (459 ± 96 N), compared with ISF (327 ± 76 N), p = 0.002. CONCLUSION: Minimal tendon displacement of less than 2 mm occurred during cyclic testing in both groups. The two premature failures and significantly reduced load to failure observed in the ISF group, however, indicate that the traditional TT technique is more robust. Regarding clinical relevance, this study suggests that early active range of motion and protected weight bearing may be safe following FDL tendon transfer for stage 2 tibialis posterior tendon dysfunction.

  • JOURNAL ARTICLE
    Milner PE, Parkes M, Puetzer JL, Chapman R, Stevens MM, Cann P, Jeffers JRTet al., 2018,

    A low friction, biphasic and boundary lubricating hydrogel for cartilage replacement

    , ACTA BIOMATERIALIA, Vol: 65, Pages: 102-111, ISSN: 1742-7061
  • 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
    Ng KCG, El Daou H, Bankes M, Rodriguez y Baena F, Jeffers Jet al., 2018,

    Hip Joint Torsional Loading Before and After Cam FAI Surgery

    , AMERICAN JOURNAL OF SPORTS MEDICINE, ISSN: 0363-5465

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