Evidence map›Paper›PMID 34269849›Full record

ArticleKnee surgery, sports traumatology, arthroscopy : official journal of the ESSKA2022

Effect of distance between the feet on knee joint line orientation after total knee arthroplasty in standing full-limb radiographs.

Na-Kyoung Lee, Tae Woo Kim, Sanghoon Lee, Yun Seong Choi, Seung-Baik Kang, Chong Bum Chang

Abstract read
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In one paragraph

Article in Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
7citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

7 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Pooled it
  2. Review
  3. Article
  4. Joint line and knee osteotomy.EFORT open reviews · 2024
    Review
  5. Latarjet procedure without capsular repair produces favorable clinical results and avoids limitation in external rotation.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2023
    Article
  6. Article
  7. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

Na-Kyoung LeeDepartment of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seongnam-si, South Korea.
Tae Woo KimDepartment of Orthopaedic Surgery, SMG-SNU Boramae Medical Center, Seoul, South Korea. orthopassion@naver.com.ORCID http://orcid.org/0000-0003-2731-749X
Sanghoon LeeDepartment of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seongnam-si, South Korea.
Yun Seong ChoiDepartment of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seongnam-si, South Korea.
Seung-Baik KangDepartment of Orthopaedic Surgery, SMG-SNU Boramae Medical Center, Seoul, South Korea.
Chong Bum ChangDepartment of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seongnam-si, South Korea.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeAlthough knee joint line orientation (KJLO) after total knee arthroplasty (TKA) has been emphasized as an important factor that can affect postoperative knee kinematics, the effect of foot position on KJLO has not been fully understood. This study aimed to (1) identify the anatomical and positional factors that determine KJLO after TKA, and (2) determine the effect of foot position on KJLO after TKA. The hypothesis of this study was that the post-TKA KJLO would change depending on the distance between the feet, as well as the coronal implant positions.

methodsA total of 92 radiographs from 46 patients who underwent TKA were retrospectively reviewed. Two postoperative standing full-limb anteroposterior radiographs taken with the feet in different positions (with both feet in contact with each other or shoulder width apart) from each patient were evaluated. The correlation between KJLO after TKA and possible anatomical and positional factors, including leg length, lateral distal femoral angle (LDFA), medial proximal tibial angle (MPTA), ankle joint line orientation (AJLO), mechanical tibiofemoral angle (mTFA), and distance between the feet, were analyzed, and the KJLO equation was computed using multiple linear regression. KJLO was also compared among different combinations of valgus or varus alignment of the femoral and tibial components.

resultsLDFA, MPTA, AJLO, and distance between the feet were identified as determinants of KJLO after TKA, and the distance between the feet was strongly correlated with KJLO. Based on the KJLO equation (KJLO [°] = 107.548 - 0.441 × LDFA [°] - 0.832 × MPTA [°] + 0.093 × AJLO [°] + 0.037 × ITD [mm]), KJLO changes by 3.7° per 100 mm of distance between the feet. The KJLO of patients with valgus femoral and varus tibial components was more parallel to the ground than those with other combinations.

conclusionKJLO after TKA was strongly affected by the distance between the feet when taking full-limb radiography, and the KJLO changed by 3.7° per 100 mm of distance between the feet. To assess the KJLO after TKA reproducibly, standardization of the distance between the feet is necessary. LEVEL OF EVIDENCE: IV.

Indexed as

Arthroplasty, Replacement, KneeOsteoarthritis, KneeFemurHumansKnee JointRadiographyRetrospective StudiesTibiaAnkle joint line orientationComponent alignmentDistance between the feetKnee joint line orientationTotal knee arthroplasty

Identifiers

PMID34269849

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.