Evidence map›Paper›PMID 33431062›Full record

ArticleKnee surgery & related research2021

Change of joint-line convergence angle should be considered for accurate alignment correction in high tibial osteotomy.

Young Gon Na, Beom Koo Lee, Ji Uk Choi, Byung Hoon Lee, Jae Ang Sim

Registry-linked trialOpen access · diamondAbstract read
In one paragraph

Article in Knee surgery & related research, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT07410429 (Realigning Rehab), which is not on this map. Cited by 40 papers.

0numbers the graph read from it
0cells of the map it votes in
40citing papers in PubMed
10.5field-weighted citation impact, top 1% of its field
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.

NCT07410429 naactive not recruitingnot on this mapstarted 2025, after this paper: background citation

Realigning Rehab: A Randomized Controlled Trial on Specific Exercises Versus Standard Care for Medial Knee Pain and Varus Alignment

TypeinterventionalSponsorAssiut UniversityRan2025 to 2026Enrolled80ConditionsKnee Osteoarthritis (Kellgren-Lawrence Grade 1-3)ArmsConventional Knee Physical Therapy Program, Targeted Alignment-Focused Exercise Program for Varus Knee
3 · Its place in the literature

Who cites it

40 citing papers in PubMed, 58 citations in OpenAlex.

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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

5 authors at 3 institutions in 1 country.

Young Gon NaDepartment of Orthopedic Surgery, CM Hospital, Yeongdeungpo-ro 36-gil, Yeongdeungpo-gu, 07301, South Korea.
Beom Koo LeeDepartment of Orthopedic Surgery, Gachon University Gil Medical Center, 21, Namdong-daero 774 beon-gil, Namdong-gu, Incheon, 21565, South Korea.
Ji Uk ChoiDepartment of Orthopedic Surgery, Gachon University Gil Medical Center, 21, Namdong-daero 774 beon-gil, Namdong-gu, Incheon, 21565, South Korea.
Byung Hoon LeeDepartment of Orthopedic Surgery, Gachon University Gil Medical Center, 21, Namdong-daero 774 beon-gil, Namdong-gu, Incheon, 21565, South Korea.
Jae Ang SimDepartment of Orthopedic Surgery, Gachon University Gil Medical Center, 21, Namdong-daero 774 beon-gil, Namdong-gu, Incheon, 21565, South Korea. sim_ja@gilhospital.com.ORCID http://orcid.org/0000-0002-2055-6458
Gachon University Gil Medical Center · KRCM Hospital · KRGachon University · KR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundThe alignment correction after high tibial osteotomy (HTO) is made both by bony correction and soft-tissue correction around the knee. Change of the joint-line convergence angle (JLCA) represents the soft-tissue correction after HTO, which is the angle made by a tangential line between the femoral condyles and the tibial plateau. We described the patterns of JLCA change and related factors after HTO and investigated the appropriate preoperative planning method.

methodsEighty patients who underwent HTO between 2013 and 2016 were included for this retrospective study. Standing, whole-limb radiograph, supine knee anteroposterior (AP) and lateral were measured on the preoperative and postoperative radiographs. The patterns of JLCA changes and related factors were analyzed.

resultsJLCA decreased by a mean of 0.9° ± 1.2° (P < 0.001) after HTO. Sixteen patients (20%, group II) showed a greater JLCA decrease ≥ 2°, while 64 (80%, group I) patients remained in a narrow range of JLCA change < 2°. Group II showed more varus deformity (varus 8.1° vs. varus 4.7° in the mechanical femorotibial angle, P < 0.001), greater JLCA on standing (4.9° vs. 2.1°, P < 0.001), and the difference of JLCA in the standing and supine positions (2.8° vs. 0.7°, P < 0.001) preoperatively compared to group I. The risk of a greater JLCA decrease ≥ 2° was associated with greater preoperative JLCA in the standing position and the difference between the JLCA in the standing and supine positions. Postoperative JLCA correlated better with preoperative JLCA in the supine position than those in the standing position. A preoperative JLCA ≥ 4° or the difference of preoperative JLCA in the standing and supine positions ≥ 1.7° was the cut-off value to predict a large JLCA decrease ≥ 2° after HTO in the receiver operating characteristic (ROC) curve analysis.

conclusionsSurgeons should consider the effect of the JLCA change during the preoperative planning and intraoperative procedure to avoid unintended overcorrection.

Indexed as

AlignmentHigh tibial osteotomyJoint-line convergence angleKneeOsteoarthritis

Identifiers

PMID33431062
PMCPMC7798206
OpenAlexW3119894918

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LicenceCC BY
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Registered trials

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.