Joint line changes after primary total knee arthroplasty: navigated versus non-navigated

Jawhar, Ahmed; Shah, Vivek M.; Sohoni, S.; Scharf, Hanns‐Peter

doi:10.1007/s00167-013-2580-2

Cited by 29 publications

(30 citation statements)

References 41 publications

(105 reference statements)

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“…A line perpendicular to the anatomical axis of the tibia (imitating the classic resection technique) was drawn at the level of the most proximal tip of the FH [13][14][15][16]. To determine the distance from the FH to the JL in either the medial or the lateral compartment, measurements from the perpendicular line at the level of the FH to the MFC (FHMFC) and to the LFC (FHLFC) were performed.…”

Section: Mri Measurementsmentioning

confidence: 99%

Accuracy of bony landmarks for restoring the natural joint line in revision knee surgery: an MRI study

Maderbacher

Keshmiri

Schaumburger

et al. 2014

International Orthopaedics (SICOT)

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Purpose Restoring the joint line (JL) improves clinical and functional outcome in total knee arthroplasty (TKA). Therefore, anatomical landmarks to approximate the JL have been published. So far, the natural deviation of the JL 90°to the mechanical tibial axis has not been considered. Thus, we designed this study to: (1) determine the natural JL of knees in healthy persons in respect to the mechanical tibial axis, (2) validate and double-check intra-operative bony landmarks already been published in respect to the natural JL and (3) find possible correlations between distances from bony landmarks to the JL and femoral and tibial width. Methods Eighty MRI scans of knees of healthy persons were examined by two independent observers. Distances from the tip of the fibular head (FH), the medial (ME) and lateral (LE) epicondyles and the adductor tubercle (AT) to the JL within the medial and lateral compartment were measured. Further, we determined the orientation of the JL in respect to the mechanical axis of the tibia. Interobserver correlations were calculated. Differences were analyzed using Student's t test. Linear regression models were calculated to analyze correlations. Results Interobserver correlation was excellent. Mean JL deviation was 4.2°varus. Distance between the FH, ME, LE and AT to the JL within the medial compartment was 12.2, 33.9, 33.4 and 45.4 mm, respectively. Within in the lateral compartment, distances were 15.3, 31.0, 30.6 and 42.3 mm to the JL. Strong correlation was found between femoral width and distances from the AT, ME and LE to the JL. ConclusionIn TKA, the JL is usually altered due to the classic resection technique, which does not respect the natural deviation of the JL. Estimating the natural JL by adding absolute values to bony landmarks, as proposed in the literature, is not recommended. According to our data, the JL can be best estimated by adding the calculated value: 6.40+(width femur [mm] × 0.49) to the AT.

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Section: Mri Measurementsmentioning

confidence: 99%

Accuracy of bony landmarks for restoring the natural joint line in revision knee surgery: an MRI study

Maderbacher

Keshmiri

Schaumburger

et al. 2014

International Orthopaedics (SICOT)

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“…Computer navigation has made the position of components more accurate in total knee arthroplasty (16). This equipment allows us to a make distal femoral cut angle in the exact correct angle to the mechanical axis of the femur (17).…”

Section: Discussionmentioning

confidence: 99%

Is it Safe to Use a Six-Degree Distal Femoral Valgus Cut in All Genu Varus Patients with Total Knee Arthroplasty?

et al. 2017

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Background: During a total knee arthroplasty, it is common to make a distal femoral cut based on the femoral mechanicalanatomical angle (FMA), which in most patients is six degrees. However, in patients with a higher FMA, there is not yet a consensus between surgeons regarding the degree of the cutting angle. Objectives: The aim of this study is to assess the treatment outcomes of patients with a FMA of more than seven degrees who were treated by distal femoral cuts of six degrees during a total knee arthroplasty. Methods: We retrospectively reviewed the clinical and radiological results of patients who were treated at our center by a conventional valgus cut of six degrees during a total knee arthroplasty and had a FMA of more than seven degrees. A knee society score (KSS) was completed for all patients during follow-up visits. Results: A total of 31 cases with knee osteoarthritis and a FMA of more than seven degrees were enrolled in this study. The cases

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“…System na wi ga cji wska zu je chi rur go wi punk ty ana tomicz ne i ob ra zy ra dio lo gicz ne. Wy ka za no, że na wiga cja za sto so wa na w trak cie TKA po zwa la uzy skać lep sze usta wie nie en do pro te zy niż pod czas za bie gów kon wen cjo nal nych [10][11][12][13][14].…”

Section: Discussionunclassified

Evaluation of Outcomes of Total Knee Replacement with and without a Navigation System

Synder¹,

Altimimi²,

Borowski³

et al. 2016

Ortop Traumatol Rehabil

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Joint line changes after primary total knee arthroplasty: navigated versus non-navigated

Abstract: Diagnostic study, Level III.

Cited by 29 publications

References 41 publications

Accuracy of bony landmarks for restoring the natural joint line in revision knee surgery: an MRI study

Accuracy of bony landmarks for restoring the natural joint line in revision knee surgery: an MRI study

Is it Safe to Use a Six-Degree Distal Femoral Valgus Cut in All Genu Varus Patients with Total Knee Arthroplasty?

Evaluation of Outcomes of Total Knee Replacement with and without a Navigation System

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