ArticleOrthopedic reviews2024
Femorotibial angle on short knee radiographs fails to accurately predict the lower limb mechanical alignment. A systematic review and meta-analysis on different femorotibial angle definitions and short knee radiograph types.
Article in Orthopedic reviews, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed.
- Kinematic alignment, but not mechanical alignment, preserves the knee-ankle relationship after total knee arthroplasty: A retrospective radiographic analysis from the FP-UCBM Knee Study Group.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2026Article
- Posterior tibial slope varies across functional tibial phenotypes but not CPAK categories: A radiographic analysis from the FP-UCBM Knee Study Group.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2026Article
- Unrestricted kinematic alignment in varus total knee arthroplasty outperforms mechanical alignment in CPAK I phenotype, but yields comparable outcomes in CPAK IV: A retrospective analysis from the FP-UCBM Knee Study Group.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2026Article
- Kinematic alignment preserves the mid-flexion trochlear line orientation in total knee arthroplasty: A prospective analysis from the FP-UCBM Knee Study Group.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2026Article
- Validation of the Posture Analyzing and Virtual Reconstruction (PAViR) System for Measuring the Hip-Knee-Ankle Angle Using 2D Photogrammetry and Computer Vision.Diagnostics (Basel, Switzerland) · 2026Article
- The length of lateral radiographs significantly impacts the measurement of the femoral intramedullary axis in patients undergoing total knee arthroplasty.Arthroplasty (London, England) · 2026Article
- The 'over-the-top' technique allows for accurate and reproducible restoration of the native tibial slope in kinematically aligned total knee arthroplasty: A retrospective comparative analysis from the FP-UCBM Knee Study Group.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2025Article
- Comparable outcomes with a potential functional advantage of PCL preservation in medial-stabilized total knee arthroplasty: A systematic review and meta-analysis from the FP-UCBM Knee Study Group.Journal of experimental orthopaedics · 2025Review
- Distinct effects of three knee-preserving surgeries on hip-knee-ankle alignment in patients with knee osteoarthritis.Journal of orthopaedic surgery and research · 2025Article
- Cartilage thickness can be accurately measured intraoperatively in total knee arthroplasty: A step further in calipered kinematic alignment.Journal of experimental orthopaedics · 2025Article
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Authors and funding
9 authors.
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No grant is acknowledged in the PubMed record.
Abstract
Introduction: Hip-knee-ankle angle (HKA) on Full Limb Radiographs (FLRs) is the gold standard for coronal knee alignment assessment. Despite the widespread utilization of the more convenient femorotibial angle (FTA) on either antero-posterior (AP) or postero-anterior (PA) short knee radiographs (SKRs), its definition and correlation with HKA remains controversial. This review is the first to systematically investigate FTA-HKA correlation and the effect of different FTA methods and SKRs. Methods: Systematic literature search (Pubmed, Scopus, Cochrane Library) followed PRISMA guidelines, to evaluate studies examining the FTA-HKA correlation. Meta-analyses compared the 3 most common FTA methods, knee center determination method and SKR types. Results: 17 studies (2597 patients, 3234 knees) were included. The strongest correlation with HKA (r = 0.78) was found for FTA Method 1 (angle formed by lines drawn from the midpoint of tibial spines to points 10 cm above and below the joint line). No significant differences were observed when grouping the FTA methods by knee center assessment (Group I, r = 0.78; Group II, r = 0.77). AP SKRs showed a trend towards stronger FTA-HKA correlation compared to PA SKRs, in both Method 1 (r = 0.79 vs 0.75) and Method 3 (r = 0.80 vs 0.66). Conclusion: Irrespective of its definition or type of SKR used, FTA lacks reliable accuracy in predicting the HKA in most knees. FLRs should be used whenever precise estimation of the patient's alignment is necessary. Caution is warranted in interpreting studies investigating knee alignment or knee arthroplasty outcomes based on FTA.
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