Evidence map›Paper›PMID 30906795›Full record

ArticleOrthopaedic journal of sports medicine2019

Geometry of Torsional Malalignment Syndrome: Trochlear Dysplasia but Not Torsion Predicts Lateral Patellar Instability.

Peter Balcarek, Tobias Radebold, Xenia Schulz, Dennis Vogel

Abstract read
In one paragraph

Article in Orthopaedic journal of sports medicine, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 30 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
30citing 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

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

  1. Pooled it
  2. Age-Dependent Susceptibility to Mechanical Unloading-Induced Femoral Morphological Changes and Patellar Instability in a Rat Model.Journal of orthopaedic research : official publication of the Orthopaedic Research Society · 2026
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  4. Age at the time of surgery does not compromise the outcome of deepening trochleoplasty: Results from under and over 30 years old.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2026
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  16. Correction of tibial tubercle trochlea groove distance is related to torsional correction in high tibial derotational osteotomy.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2023
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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

4 authors.

Peter BalcarekARCUS Sportklinik, Pforzheim, Germany.
Tobias RadeboldDepartment of Orthopedics and Traumatology, Lichtenau eV, Hessisch Lichtenau, Germany.
Xenia SchulzDepartment of Medical Statistics, University Medical Center Göttingen, University of Göttingen, Göttingen, Germany.
Dennis VogelARCUS Sportklinik, Pforzheim, Germany.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundThe clinical impact of increased torsion on patellar instability and patellofemoral pain syndrome (PFPS) has been suggested by several studies. HYPOTHESIS: The hypotheses of this study were that (1) torsional malalignment (TM) is characterized by a positive correlation between different malalignment parameters that represent an overall picture of the malalignment syndrome and (2) an increase in overall torsion is the underlying difference between patellar instability and isolated patellofemoral pain. STUDY

designCohort study; Level of evidence, 3.

methodsBetween April 2015 and July 2017, a total of 428 patients were treated for lateral patellar dislocation (LPD), and 333 patients were treated for PFPS. Sixty-two patients (14.5%) with patellar instability (LPD group) and 29 patients (8.7%) with patellofemoral pain (PFPS group) had additional TM and were included in this study. All patients underwent magnetic resonance imaging for torsional alignment and patellar tracking, including femoral antetorsion, tibial torsion, knee rotation, tibial tuberosity-trochlear groove (TT-TG) distance, tibial tuberosity-posterior cruciate ligament (TT-PCL) distance, Dejour classification of trochlear dysplasia, lateral trochlear inclination (LTI) angle, and patellar height.

resultsThe LPD and PFPS groups differed significantly in terms of trochlear dysplasia (

conclusionTM in patients with either PFPS or LPD does not appear to be characterized by a fixed constellation of different malalignment parameters. Between groups, the parameters differed significantly only in terms of trochlear dysplasia and the TT-TG distance, and trochlear dysplasia (type B-D) (but not torsion) was identified as a predictor of lateral patellar instability.

Indexed as

patellar instabilitypatellofemoral paintorsional malalignment

Identifiers

PMID30906795
PMCPMC6421616

What OpenQuestion holds

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Registered trials

None linked

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.