Publications
470 results found
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
Masouros SD, Parker KH, Hill AM, et 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.
Masouros SD, McDermott ID, Amis AA, et 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.
Amadi HO, Gupte CM, Lie DTT, et 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.
Dandachli W, 2008, Frames of Reference for Morphometric Analysis of the Hip Joint
Bull AMJ, Kessler O, Alam M, et 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
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- Citations: 92
Smith CD, Masouros S, Hill AM, et al., 2008, Mechanical testing of intra-articular tissues. Relating experiments to physiological function, CURRENT ORTHOPAEDICS, Vol: 22, Pages: 341-348, ISSN: 0268-0890
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- Citations: 6
Hopkins AR, Hansen UN, Bull AM, et al., 2008, Fixation of the reversed shoulder prosthesis, J Shoulder and Elbow Surgery, 2008
Ismail M, Karim A, Shulman R, et 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.
McDermott ID, Lie DTT, Edwards A, et al., 2008, The effects of lateral meniscal allograft transplantation techniques on tibio-femoral contact pressures, KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 16, Pages: 553-560, ISSN: 0942-2056
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- Citations: 78
McDermott ID, Masouros SD, Amis AA, 2008, Biomechanics of the menisci of the knee, CURRENT ORTHOPAEDICS, Vol: 22, Pages: 193-201, ISSN: 0268-0890
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- Citations: 75
Brassart N, Sanghavi S, Hansen UN, et 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
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- Citations: 5
Merican AM, Amis AA, 2008, Anatomy of the lateral retinaculum of the knee, JOURNAL OF BONE AND JOINT SURGERY-BRITISH VOLUME, Vol: 90B, Pages: 527-534, ISSN: 0301-620X
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- Citations: 80
Iranpour F, Merican AM, Amis AA, et al., 2008, The width:thickness ratio of the patella: an aid in knee arthroplasty., Clin Orthop Relat Res., Vol: 466(5), Pages: 1198-1203
Establishing the appropriate size of the patellar implant-bone composite is one of the important steps ensuring functional success in arthroplasty. Conventionally, the patella is measured intraoperatively and its thickness is used to guide the depth of resection. However, in a diseased joint, this may not reflect the native patellar thickness. We studied the relationship between the patellar thickness and various patellar dimensions on three-dimensional reconstructed computed tomographic scans from 37 normal adult knees. Patellar width correlated with thickness. The average patellar width:thickness ratio was 2.0 (standard deviation, 0.106; 95% confidence interval, 1.96-2.03). The cartilage thickness was on average 2.5 mm (standard deviation, 1.0). The width:thickness ratio was similar in 79 digital radiographs taken before TKA of knees without patellofemoral disease (mean, 2.1; standard deviation, 0.28). When compared with the two other methods for calculating patellar resection described in the literature, the width:thickness ratio was more reliable. The width:thickness ratio appears anatomically constant and may be a useful guide for estimating premorbid patellar thickness.
Apsingi S, Nguyen T, Bull AMJ, et al., 2008, Control of laxity in knees with combined posterior cruciate ligament and posterolateral corner deficiency - Comparison of single-bundle versus double-bundle posterior cruciate ligament reconstruction combined with modified Larson posterolateral corner reconstruction, AMERICAN JOURNAL OF SPORTS MEDICINE, Vol: 36, Pages: 487-494, ISSN: 0363-5465
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- Citations: 47
Apsingi S, Nguyen T, Bull AMJ, et al., 2008, The role of PCL reconstruction in knees with combined PCL and posterolateral corner deficiency, KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 16, Pages: 104-111, ISSN: 0942-2056
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- Citations: 21
Al-Hadithi M, Hughes SPF, Amis AA, 2008, The effect of different insertion points on the security of pedicle screw fixation in bovine vertebrae, SPINE, Vol: 33, Pages: 169-172, ISSN: 0362-2436
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- Citations: 4
Edwards A, Bull AMJ, Amis AA, 2008, The attachments of the anteromedial and posterolateral fibre bundles of the anterior cruciate ligament - Part 2: Femoral attachment, KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 16, Pages: 29-36, ISSN: 0942-2056
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- Citations: 134
Smith CD, Masouros SD, Hill AM, et al., 2008, Tensile properties of the human glenoid labrum, JOURNAL OF ANATOMY, Vol: 212, Pages: 49-54, ISSN: 0021-8782
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- Citations: 20
Amis AA, Cuomo P, Rama RBS, et al., 2008, Measurement of Knee Laxity and Pivot Shift Kinematics With Magnetic Sensors, OPERATIVE TECHNIQUES IN ORTHOPAEDICS, ISSN: 1048-6666
Amis AA, Oguz C, Bull AMJ, 2008, The effect of trochleoplasty on patellar stability and kinematics - a biomechanical study in-vitro, J. Bone Joint Surg - Br, Vol: 90-B, Pages: 864-869
Apsingi S, Nguyen T, Bull AMJ, et al., 2008, The role of PCL reconstruction in knees with combined PCL and posterolateral corner deficiency, Knee Surg. Sports Traumatol. Arthrosc., Vol: 16, Pages: 104-111
Edwards A, Bull AM, Amis AA, 2007, The attachments of the anteromedial and posterolateral fibre bundles of the anterior cruciate ligament: Part 1: tibial attachment., Knee Surg Sports Traumatol Arthrosc, Vol: 15, Pages: 1414-1421, ISSN: 0942-2056
The tibial attachments of the individual anteromedial (AM) and posterolateral (PL) fibre bundles and the entire attachment of the anterior cruciate ligament are described, relating them to consistent bony landmarks; 55 fresh-frozen specimens were measured. The fibre bundles were separated and excised at their attachments and their peripheries marked with a pen. High-resolution scaled digital photographs were taken of each dissected specimen and transferred onto a computer for analysis. A wide variation was found when using the posterior tibial axis, the anterior tibial surface and the medial tibial spine as reference points. The most consistent measurements used the tibial interspinous "over-the-back" ridge as a datum. The attachments of the PL and AM bundles were centred 10 +/- 1 mm (mean +/- SD) and 17 +/- 2 mm anterior to the over-the-back ridge. They were 4 +/- 1 and 5 +/- 1 mm, respectively, lateral to the medial tibial spine border. The positions of 6 mm circles in the posterior-medial limits of the fibre bundles (representing tunnels in a double-tunnel reconstruction) were measured. The overall dimensions of the tibial plateaux correlated significantly with many measurements. The results from this study could be used to guide ACL reconstruction techniques.
Abdul-Kadir MR, Hansen UN, Klabunde R, et al., 2007, Finite element modelling of primary hip stem stability: The effect of interference fit, Journal of Biomechanics
Khan RT, Lie DT, Cashman PM, et al., 2007, Measurement of laxity in the anterior cruciate ligament-deficient knee:: a comparison of three different methods <i>in vitro</i>, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE, Vol: 221, Pages: 653-663, ISSN: 0954-4119
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- Citations: 6
A Hart, T Seepaul, R Hewitt, et al., 2007, The palmar Locking Compression Plate is biomechanically comparable to the dorsal Pi plate for dorsally comminuted, intra-articular wrist fractures, Journal of Hand Surgery (European Volume)
Amis AA, 2007, Reply to O. Cebesoy's comments on the paper "Effects of lateral retinacular release on the lateral stability of the patella", KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 15, Pages: 826-827, ISSN: 0942-2056
Wadia F, Kamineni S, Dhotare S, et al., 2007, Radiographic measurements of normal elbows: Clinical relevance to olecranon fractures, CLINICAL ANATOMY, Vol: 20, Pages: 407-410, ISSN: 0897-3806
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- Citations: 17
Feller JA, Amis AA, Andrish JT, et al., 2007, Surgical biomechanics of the patellofemoral joint, ARTHROSCOPY-THE JOURNAL OF ARTHROSCOPIC AND RELATED SURGERY, Vol: 23, Pages: 542-553, ISSN: 0749-8063
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- Citations: 156
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