Azhar M. Merican

artykuł

Distal Femoral Rotation Correlates With Proximal Tibial Joint Line Obliquity: A Consideration for Kinematic Total Knee Arthroplasty

Chung Kia Ng, Jerry Yongqiang Chen, Jared Ze Yang Yeh, Jade Pei Yuik Ho, więcej

The Journal of Arthroplasty > 2018 > 33 > 6 > 1936-1944

We hypothesized that there is a correlation between the distal femoral rotation and proximal tibial joint line obliquity in nonarthritic knees. This has significance for kinematic knee arthroplasty, in which the target knee alignment desired approximates the knee before disease.Fifty computed tomography scans of nonarthritic knees were evaluated using three-dimensional image processing software. Four...

artykuł

Three-Dimensional Computed Tomography Analysis of the Posterior Tibial Slope in 100 Knees

Jade Pei Yuik Ho, Azhar M. Merican, Muhammad Sufian Hashim, Azlina A. Abbas, więcej

The Journal of Arthroplasty > 2017 > 32 > 10 > 3176-3183

The posterior tibial slope (PTS) is an important consideration in knee arthroplasty. However, there is still no consensus for the optimal slope. The objectives of this study were (1) to reliably determine the native PTS in this population using 3-dimensional computed tomography scans and (2) to determine the normal reference range for PTS in this population.One hundred computed tomography scans of...

artykuł

Femoral articular geometry and patellofemoral stability

Farhad Iranpour, Azhar M Merican, Seow Hui Teo, Justin P Cobb, więcej

The Knee > 2017 > 24 > 3 > 555-563

Patellofemoral instability is a major cause of anterior knee pain. The aim of this study was to examine how the medial and lateral stability of the patellofemoral joint in the normal knee changes with knee flexion and measure its relationship to differences in femoral trochlear geometry.Twelve fresh-frozen cadaveric knees were used. Five components of the quadriceps and the iliotibial band were loaded...

artykuł

Biomechanical Analysis of Knee Laxity With Isolated Anteromedial or Posterolateral Bundle–Deficient Anterior Cruciate Ligament

Eiji Kondo, Azhar M. Merican, Kazunori Yasuda, Andrew A. Amis

Arthroscopy: The Journal of Arthroscopic and Related Surgery > 2014 > 30 > 3 > 335-343

The purpose of this study was to clarify the changes in the kinematics of the knee that result from isolated deficiency of the anteromedial (AM) or posterolateral (PL) bundle.Fourteen cadaveric knees were mounted in a 6-df rig and tested using the following 5 loading conditions: 90-N anterior and posterior tibial loads, 5-Nm internal and external tibial torques, and a simulated pivot-shift test. Tibiofemoral...

artykuł

Patellar thickness and lateral retinacular release affects patellofemoral kinematics in total knee arthroplasty

Azhar M. Merican, Kanishka M. Ghosh, Ferdinando Rodriguez Y. Baena, David J. Deehan, więcej

Knee Surgery, Sports Traumatology, Arthroscopy > 2014 > 22 > 3 > 526-533

Purpose To study the effect of increasing patellar thickness (overstuffing) on patellofemoral kinematics in total knee arthroplasty and whether subsequent lateral retinacular release would restore the change in kinematics. Methods The quadriceps of eight fresh-frozen knees were loaded on a custom-made jig. Kinematic data were recorded using an optical tracking device for the native knee, following...

artykuł

Length-change patterns of the collateral ligaments after total knee arthroplasty

K. Milton Ghosh, Azhar M. Merican, Farhad Iranpour, David J. Deehan, więcej

Knee Surgery, Sports Traumatology, Arthroscopy > 2012 > 20 > 7 > 1349-1356

Purpose Total knee arthroplasty (TKA) is a procedure with function dependent upon correct tensioning of the soft-tissue constraints. The purpose of this study was to examine the length-change behaviour of the collateral ligaments during knee flexion–extension before and after TKA. The influence of differing degrees of internal-external rotation of the femoral component on slackening/tightening of...

artykuł

Paper # 100: Winner of the Patellofemoral Research Excellence Award The Geometry and Function of the Patellofemoral Joint

Farhad Iranpour, Azhar M. Merican, Andrew A. Amis, Justin P. Cobb

Arthroscopy: The Journal of Arthroscopic and Related Surgery > 2011 > 27 > 10 Supplement > e134

artykuł

Paper # 253: Biomechanical Analysis of Partial Tears of Anteromedial and Posterolateral Bundles of the Anterior Cruciate Ligament

Eiji Kondo, Azhar M. Merican, Kazunori Yasuda, Andrew A. Amis

Arthroscopy: The Journal of Arthroscopic and Related Surgery > 2011 > 27 > 10 Supplement > e239-e241

artykuł

Paper # 11: Biomechanical Comparison of Anatomic Double-Bundle, Anatomic Single-Bundle and Non-Anatomic Single-Bundle Anterior Cruciate Ligament Reconstructions

Eiji Kondo, Azhar M. Merican, Kazunori Yasuda, Andrew A. Amis

Arthroscopy: The Journal of Arthroscopic and Related Surgery > 2011 > 27 > 10 Supplement > e75-e76

artykuł

The effect of femoral component rotation on the extensor retinaculum of the knee

Kanishka M. Ghosh, Azhar M. Merican, Farhad Iranpour, David J. Deehan, więcej

Journal of Orthopaedic Research® > 28 > 9 > 1136 - 1141

Malrotation of the femoral component may cause patellofemoral complications after total knee replacement (TKR). We hypothesized that femoral component malrotation would cause excessive lengthening of the retinacula. Retinacular length changes were measured by threading fine sutures along them and attaching these to the patella and to displacement transducers. The knee post‐TKR was flexed‐extended...

artykuł

Patellofemoral joint kinematics: The circular path of the patella around the trochlear axis

Farhad Iranpour, Azhar M. Merican, Ferdinando Rodriguez Y. Baena, Justin P. Cobb, więcej

Journal of Orthopaedic Research® > 28 > 5 > 589 - 594

Differing descriptions of patellar motion relative to the femur have resulted from previous studies. We hypothesized that patellar kinematics would correlate to the trochlear geometry and that differing descriptions could be reconciled by accounting for differing alignments of measurement axes. Seven normal fresh‐frozen knees were CT scanned, and their kinematics with quadriceps loading was measured...

artykuł

The Geometry of the Trochlear Groove

Farhad Iranpour, Azhar M. Merican, Wael Dandachli, Andrew A. Amis, więcej

Clinical Orthopaedics and Related Research® > 2010 > 468 > 3 > 782-788

Background In the natural and prosthetic knees the position, shape, and orientation of the trochlea groove are three of the key determinants of function and dysfunction, yet the rules governing these three features remain elusive. Questions/Purpose The aim was to define the three-dimensional geometry of the femoral trochlea and its relation to the tibiofemoral joint in terms of angles and distances...

artykuł

First Series of Exeter Small Stem Primary Total Hip Arthroplasty Minimum 5 Years of Follow-Up

Cheh Chin Tai, Hui Yin Nam, Azlina Amir Abbas, Azhar M. Merican, więcej

The Journal of Arthroplasty > 2009 > 24 > 8 > 1200-1204

We carried out a prospective study of 47 Exeter (Stryker Inc, Warsaw, Ind) small stem total hip arthroplasty in 42 patients with an average age of 58 years and a mean follow-up of 8.5 years. The Oxford hip score improved from a preoperative mean of 47 to 17 at last follow-up. More than 87% patients had excellent or good Harris hip scores, and 90% were able to walk with little or no pain. Stem subsidence...

artykuł

The structural properties of the lateral retinaculum and capsular complex of the knee

Azhar M. Merican, Sanjay Sanghavi, Farhad Iranpour, Andrew A. Amis

Journal of Biomechanics > 2009 > 42 > 14 > 2323-2329

Although lateral retinacular releases are not uncommon, there is very little scientific knowledge about the properties of these tissues, on which to base a rationale for the surgery. We hypothesised that we could identify specific tissue bands and measure their structural properties. Eight fresh-frozen knees were dissected, and the lateral soft tissues prepared into three distinct structures: a broad...

artykuł

A Technique of Staged Lateral Release to Correct Patellar Tracking in Total Knee Arthroplasty

Robin K. Strachan, Azhar M. Merican, Bernard Devadasan, Rohit Maheshwari, więcej

The Journal of Arthroplasty > 2009 > 24 > 5 > 735-742

Optimal patellar tracking and component alignment are important in achieving a well-functioning total knee arthroplasty (TKA). The patella is constrained partly by design of the prosthetic trochlear groove, and patellar tracking is governed by a combination of static and dynamic factors. Maltracking may result from excessive or unbalanced tension in the surrounding soft tissues. This article describes...

artykuł

Iliotibial band tension affects patellofemoral and tibiofemoral kinematics

Azhar M. Merican, Andrew A. Amis

Journal of Biomechanics > 2009 > 42 > 10 > 1539-1546

The iliotibial band (ITB) has an important role in knee mechanics and tightness can cause patellofemoral maltracking. This study investigated the effects of increasing ITB tension on knee kinematics. Nine fresh-frozen cadaveric knees had the components of the quadriceps loaded with 175N. A Polaris optical tracking system was used to acquire joint kinematics during extension from 100° to 0° flexion...

artykuł

The effect on patellofemoral joint stability of selective cutting of lateral retinacular and capsular structures

Azhar M. Merican, Eiji Kondo, Andrew A. Amis

Journal of Biomechanics > 2009 > 42 > 3 > 291-296

Patient selection for lateral retinacular release (LRR) and its efficacy are controversial. Iatrogenic medial subluxation can occur with inappropriate LRR. The aim of this study was to determine the reduction in patellofemoral stability with progressively more extensive LRR. The force required to displace the patella 10mm medially and laterally in nine cadaveric knees was measured with and without...

artykuł

Radiographic features predictive of patellar maltracking during total knee arthroplasty

Shi-Lu Chia, Azhar M. Merican, Bernard Devadasan, Robin K. Strachan, więcej

Knee Surgery, Sports Traumatology, Arthroscopy > 2009 > 17 > 10 > 1217-1224

Despite improvements in component design and surgical technique, some patients still require lateral retinacular release during TKA to improve patella tracking. We studied 148 fixed-bearing TKAs to identify parameters in pre-operative knee radiographs that would predict intraoperative patellar maltracking. Digital radiographs and software were used to measure coronal alignment, distal femoral valgus...

artykuł

The Width:thickness Ratio of the Patella

Farhad Iranpour, Azhar M. Merican, Andrew A. Amis, Justin P. Cobb

Clinical Orthopaedics and Related Research® > 2008 > 466 > 5 > 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...

artykuł

Early Clinical and Radiographic Analysis of the Fitmore Cup

Azhar M. Merican, Raymond Randle

The Journal of Arthroplasty > 2006 > 21 > 6 > 846-851

The Fitmore titanium mesh cementless acetabular component in 115 hip arthroplasties was reviewed at an average of 33 months of follow-up. None were revised nor had infection. One hip dislocated 4 years postoperatively. Two femoral components were revised. The average Harris Hip Score at the last follow-up was 90 points. In the 96 sets of radiographs available, there was no loosening or new radiolucency...

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Wyniki wyszukiwania dla: Azhar M. Merican

Distal Femoral Rotation Correlates With Proximal Tibial Joint Line Obliquity: A Consideration for Kinematic Total Knee Arthroplasty

Three-Dimensional Computed Tomography Analysis of the Posterior Tibial Slope in 100 Knees

Femoral articular geometry and patellofemoral stability

Biomechanical Analysis of Knee Laxity With Isolated Anteromedial or Posterolateral Bundle–Deficient Anterior Cruciate Ligament

Patellar thickness and lateral retinacular release affects patellofemoral kinematics in total knee arthroplasty

Length-change patterns of the collateral ligaments after total knee arthroplasty

Paper # 100: Winner of the Patellofemoral Research Excellence Award The Geometry and Function of the Patellofemoral Joint

Paper # 253: Biomechanical Analysis of Partial Tears of Anteromedial and Posterolateral Bundles of the Anterior Cruciate Ligament

Paper # 11: Biomechanical Comparison of Anatomic Double-Bundle, Anatomic Single-Bundle and Non-Anatomic Single-Bundle Anterior Cruciate Ligament Reconstructions

The effect of femoral component rotation on the extensor retinaculum of the knee

Patellofemoral joint kinematics: The circular path of the patella around the trochlear axis

The Geometry of the Trochlear Groove

First Series of Exeter Small Stem Primary Total Hip Arthroplasty Minimum 5 Years of Follow-Up

The structural properties of the lateral retinaculum and capsular complex of the knee

A Technique of Staged Lateral Release to Correct Patellar Tracking in Total Knee Arthroplasty

Iliotibial band tension affects patellofemoral and tibiofemoral kinematics

The effect on patellofemoral joint stability of selective cutting of lateral retinacular and capsular structures

Radiographic features predictive of patellar maltracking during total knee arthroplasty

The Width:thickness Ratio of the Patella

Early Clinical and Radiographic Analysis of the Fitmore Cup

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