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Scientific Research

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Korfbal en voorste kruisband: Kniespecialist RPA Janssen slijtage: informatie, klachten, diagnose en behandeling.
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Keynote lecture KNGF: Up to date treatment ACL injury

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Femoral mechanical-anatomical angle measurements: analog vs. digital

Femoral mechanical-anatomical angle measurements: analog vs. digital

Groningen van B, Teuling den JWAM, Houterman S, Janssen RPA
J Knee Surg. 2015 Aug;28(4):315-9

Preoperative planning in total knee arthroplasty with intramedullary guiding systems requires the measurement of the femoral mechanical–anatomical angle (FMAA) for optimal alignment correction. The main goal of this study was to assess the agreement between two digital FMAA measurements and the analog FMAA measurement. Overall 41 anteroposterior weight-bearing hip-to-ankle radiographs of patients undergoing total knee arthroplasty were used for the measurements of the FMAA. The analog method (gold standard, GS) was compared with two new digital methods (DIG1 and DIG2) using intraclass correlation (ICC) and Bland–Altman plots, measured by three blinded raters. The ICC for measurements of the FMAA comparing the GS and DIG1 was 0.48 (95% confidence interval [CI] 0.20–0.68), and 0.53 (95% CI 0.26–0.73) for comparing GS and DIG2. The ICC between raters for DIG1 was 0.79 (95% CI 0.68–0.88) and 0.88 (95% CI 0.80–0.93) for DIG2. Bland–Altman plots showed a mean difference between the GS and DIG1 of −0.44 degrees, with 95% limits of agreement from 1.21 to −2.09 degrees. The mean difference between the GS and DIG2 was −0.68 degrees with 95% limits of agreement from 0.99 to −2.35 degrees. It was concluded that the digital FMAA measurement is less reliable than analog measurement in total knee arthroplasty. 

The study has been presented at Wetenschapdag Máxima Medical Center on March 21, 2013 (Eindhoven/Veldhoven, The Netherlands). The article is accepted for publication in Journal of Knee Surgery in May 2014. 


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RPA Janssen, MD PhD 
Orthopaedic Surgeon
Orthopaedic Associates Eindhoven Greater Area
Orthopedic Center Máxima
Máxima Medical Center (MMC)

Visiting adress MMC Eindhoven:
Ds. Th. Fliednerstraat 1
Ingang Zuid
5631 BM  Eindhoven
The Netherlands 
(outpatient clinic and surgery)

Visiting adress MMC Veldhoven:
De Run 4600
5504 DB  Veldhoven
The Netherlands
(Outpatient clinic)

Mail adress:
Postbus 90052
5600 PD  Eindhoven
The Netherlands

Tel. 0031 (0)40 88 88 600
(Call center Orthopedie)

Fax: 0031 (0)40 88 85 938
www.rpajanssen.com 

Links:
Orthopaedic Associates Eindhoven Greater Area
Máxima Medical Center
Orthopaedic Center Máxima
 

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