Publications
52 results found
Hirschmann MT, Sayani J, Amis AA, et al., 2010, The pathoanatomy of osteoarthritic and dysplastic patellofemoral joints, SWISS MEDICAL WEEKLY, Vol: 140, Pages: 33S-33S, ISSN: 1424-7860
Hirschmann MT, Konala P, Iranpour F, et al., 2010, Clinical value of Tc-99m-DPD-SPECT/CT for evaluation of patients with pain following total knee arthroplasty - a new dimension of diagnostics, SWISS MEDICAL WEEKLY, Vol: 140, Pages: 17S-17S, ISSN: 1424-7860
Hirschmann MT, Iranpour F, Mueller W, et al., 2010, Surgical Treatment of Complex Bicruciate Knee Ligament Injuries in Elite Athletes What Long-term Outcome Can We Expect?, AMERICAN JOURNAL OF SPORTS MEDICINE, Vol: 38, Pages: 1103-1109, ISSN: 0363-5465
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- Citations: 39
Hirschmann MT, Davda K, Iranpour F, et al., 2010, Combined single photon emission computerised tomography and conventional computerised tomography (SPECT/CT) in patellofemoral disorders: a clinical review., Int Orthop
Iranpour F, Merican AM, Dandachli W, et al., 2010, The Geometry of the Trochlear Groove, CLINICAL ORTHOPAEDICS AND RELATED RESEARCH, Vol: 468, Pages: 782-788, ISSN: 0009-921X
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- Citations: 75
Iranpour F, Merican A, Dandachli W, et al., 2010, The geometry of the trochlear groove, Annual Conference of the European Federation of National Associations of Orthopaedics and Traumatology (EFORT)
Iranpour F, Merican AM, Rodriguez y Baena F, et al., 2010, Patellofemoral Joint Kinematics: The Circular Path of the Patella around the Trochlear Axis, J Orthop Res, Vol: 28, Pages: 589-594, ISSN: 0736-0266
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 by an optical tracker system. Kinematics was calculated in relation to the femoral epicondylar, anatomic, and mechanical axes. A novel trochlear axis was defined, between the centers of spheres best fitted to the medial and lateral trochlear articular surfaces. The path of the center of the patella was circular and uniplanar (root-mean-square error 0.3 mm) above 16 +/- 3 degrees (mean +/- SD) knee flexion. In the coronal plane, this circle was aligned 6 +/- 2 degrees from the femoral anatomical axis, close to the mechanical axis alignment. It was 91 +/- 3 degrees from the epicondylar axis, and 88 +/- 3 degrees from the trochlear axis. In the transverse plane it was 91 +/- 3 degrees and 88 +/- 3 degrees from the epicondylar and trochlear axes, respectively. Manipulation of the data to different axis alignments showed that differing previously published data could be reconciled. The circular path of patellar motion around the trochlea, aligned with the mechanical axis of the leg, is easily visualized and understood. (C) 2009 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 28:589-594, 2010
Merican AM, Sanghavi S, Iranpour F, et al., 2009, The structural properties of the lateral retinaculum and capsular complex of the knee, JOURNAL OF BIOMECHANICS, Vol: 42, Pages: 2323-2329, ISSN: 0021-9290
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- Citations: 49
Ghosh KM, Merican AM, Iranpour F, et al., 2009, The effect of overstuffing the patellofemoral joint on the extensor retinaculum of the knee, KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY, Vol: 17, Pages: 1211-1216, ISSN: 0942-2056
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- Citations: 48
Ghosh KM, Merican AM, Iranpour-Boroujeni F, et al., 2009, Length Change Patterns of the Extensor Retinaculum and the Effect of Total Knee Replacement, JOURNAL OF ORTHOPAEDIC RESEARCH, Vol: 27, Pages: 865-870, ISSN: 0736-0266
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- Citations: 35
Hirschmann MT, Iranpour F, Davda K, et al., 2009, Combined single-photon emission computerized tomography and conventional computerized tomography (SPECT/CT): clinical value for the knee surgeons?, Knee Surg Sports Traumatol Arthrosc.
Single-photon emission computerized tomography in combination with conventional computer tomography (SPECT/CT) is an emerging technology that may hold great clinical value to the orthopaedic knee surgeon. Post-operative knee pain is a familiar condition seen in most orthopaedic clinics. Here, we present the value of SPECT/CT in three such cases of pain after surgical treatment of knee osteoarthritis (high tibial osteotomy, medial unicompartmental arthroplasty, total knee arthroplasty). In these patients with post-operative knee pain, SPECT/CT has proved to be beneficial in establishing the diagnosis and providing guidance for further treatment.
Cobb JP, Dixon H, Dandachli W, et al., 2008, The anatomic tibial axis: Reliable rotational orientation in knee arthroplasty., J Bone Joint Surg [Br]
Cobb JP, Kannan V, Dandachli W, et al., 2008, Learning how to resurface cam type femoral heads with acceptable accuracy and precision: the role of CT based navigation., J Bone Joint Surg [Am]
Cobb JP, Kannan V, Dandachli W, et al., 2008, Learning how to resurface cam-type femoral heads with acceptable accuracy and precision: The role of computed tomography-based navigation, 1st Annual United States Comprehensive Course on Total Hip Resurfacing Arthroplasty, Pages: 57-64
Background: Resurfacing arthroplasty for cam-type deformities, which are a common cause of early osteoarthritis, is a technically demanding operation. Like any other arthroplasty, it requires both accuracy and precision. On the basis of the results of series reported by expert surgeons, we considered it desirable that this operation should be performed within +/- 10 degrees of the desired angular orientation and +/- 6 mm of entry-point translation in 95% of hips. Technological aids are now available to help surgeons achieve that level of accuracy. Three models of cam-type hips of increasing severity were used to assess the efficacy of three systems of instrumentation at delivering the required level of accuracy and precision.Methods: Thirty-two students of surgical technology were instructed in hip resurfacing and shown detailed plans of the desired operative outcome for the three hips with cam-type deformity. They then used conventional instruments, imageless navigation, and computed tomography-based navigation to perform the operation as accurately as possible.Results: Conventional instrumentation produced an unacceptably wide range of entry-point errors. Imageless navigation was able to deliver adequate accuracy and precision in varus-valgus angulation and superoinferior translation, but was less satisfactory in version and anteroposterior translation. Computed tomography-based navigation enabled novice surgeons to navigate hips that had difficult cam-type deformity with acceptable precision in all four degrees of freedom measured.Conclusions: Only computed tomography-based navigation appears to be appropriate for delivering both the accuracy and the precision needed by surgeons on the steep part of their learning curve. Neither conventional neck-based instrumentation nor imageless navigation provided enough help for novice surgeons learning to perform this technically challenging operation.Clinical Relevance: Training with this computed tomography-based navigati
Dandachli W, Nakhla A, Iranpour F, et al., 2008, Can the acetabular position be derived from a pelvic frame of reference?, Clin Orthop Rel Res
Dandachli W, Nakhla A, Iranpour F, et al., 2008, Gender-specific acetabular surgery based upon a scaled pelvic frame of reference., Annual Conference of the European Federation of National Associations of Orthopaedics and Traumatology (EFORT)
Iranpour F, Merican A, Dandachli W, et al., 2008, The geometry of the trochlear groove., Annual Conference of the European Federation of National Associations of Orthopaedics and Traumatology (EFORT)
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.
IRANPOUR F, MERICAN AM, DANDACHLI W, et al., 2008, THE GEOMETRY OF THE TROCHLEAR GROOVE, ORTHOPAEDIC RESEARCH SOCIETY
Iranpour F, Cobb J, Amis AA, 2007, THE GEOMETRY OF THE PATELLOFEMORAL JOINT, JBJS, British Association for Surgery of the Knee - 2007 Meeting
Nazem K, Jabalameli K, Iranpour F, 2006, Diagnostic value of MR imaging in meniscal tears of the knee., Saudi Med Journal, Vol: 27(1), Pages: 121-122
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