Imperial College London
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DrFarhadIranpour Boroujeni

Faculty of Medicine, Department of Surgery & Cancer

Honorary Clinical Senior Lecturer
 
 
 
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Contact

 

f.iranpour

 
 
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Location

 

East WingCharing Cross Campus

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Summary

 

Publications

Citation

BibTex format

@article{Rivière:2017:10.1016/j.otsr.2017.06.017,
author = {Rivière, C and FarhadIranpour and Auvinet, E and ArashAframian and Asare, K and Harris, S and Cobb, J and Parratte, S},
doi = {10.1016/j.otsr.2017.06.017},
journal = {Orthopaedics and Traumatology: Surgery and Research},
title = {Mechanical Alignment Technique For TKA: Are there Intrinsic Technical Limitations?},
url = {http://dx.doi.org/10.1016/j.otsr.2017.06.017},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - BACKGROUND: Mechanically aligned (MA) total knee arthroplasty (TKA) is affected by disappointing functional outcomes in spite of the recent improvements in surgical precision and implant designs. This might suggest the existence of intrinsic technical limitations. Our study aims to compare the prosthetic and native trochlear articular surfaces and to estimate the extent of collateral ligament imbalance which is technically un-correctable by collateral ligament release when TKA implants are mechanically aligned. STUDY HYPOTHESIS: conventional MA technique generates a high rate of prosthetic overstuffing of the distal groove, distal lateral trochlear facet and distal lateral femoral condyle (Hypothesis 1), and technically un-correctable collateral ligament imbalance (hypothesis 2)? Disregarding the distal femoral joint line obliquity (DFJLO) when performing femoral cuts explainsdistal lateral femoral prosthetic stuffing and un-correctable imbalance (hypothesis 3)? METHODS: Twenty patients underwent a conventional MA TKA. Pre-operative MRI-based 3D knee models were generated and MA TKA was simulated. Native and prosthetic trochlear articular surfaces were compared using in-house analysis software.Following the automatic determination by the planning software of the size of the extension and flexion gaps, an algorithm was applied to balance the gaps and the frequency and amplitude of technically un-correctable knee imbalance wereestimated. RESULTS: The conventional MA technique generateda significant slight distal lateral femoral prosthetic overstuffing (mean 0.6mm, 0.8mm, 1.25 mmfor the most distal lateral facet point, groove, and at the most distal point of lateral femoral condyle, respectively) and a high rate of type 1 and 2 un-corretable knee imbalance (30% and 40%, respectively). The incidence of distal lateral prosthetic overstuffing (trochlea and condyle) and un-correctable knee imbalance were strongly to very strongly correlated with the DFJLO (r=0.53 to 0.89).
AU  - Rivière,C
AU  - FarhadIranpour
AU  - Auvinet,E
AU  - ArashAframian
AU  - Asare,K
AU  - Harris,S
AU  - Cobb,J
AU  - Parratte,S
DO  - 10.1016/j.otsr.2017.06.017
PY  - 2017///
SN  - 1877-0568
TI  - Mechanical Alignment Technique For TKA: Are there Intrinsic Technical Limitations?
T2  - Orthopaedics and Traumatology: Surgery and Research
UR  - http://dx.doi.org/10.1016/j.otsr.2017.06.017
ER  -
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