Evidence map›Paper›PMID 34392382›Full record

Trial reportInternational orthopaedics2021

Imageless robotic-assisted total knee arthroplasty accurately restores the radiological alignment with a short learning curve: a randomized controlled trial.

Satit Thiengwittayaporn, Pinyong Uthaitas, Chaipipathn Senwiruch, Natthapong Hongku, Revit Tunyasuwanakul

Abstract readRandomized Controlled Trial
PubMed Publisher
In one paragraph

Trial report in International orthopaedics, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 58 papers, 11 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
58citing papers in PubMed, 11 pooled it
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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

58 citing papers in PubMed, 11 syntheses or guidelines pooled it.

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  3. Continuous outcomes of robotic-assisted total knee arthroplasty trials are statistically fragile.European journal of orthopaedic surgery & traumatology : orthopedie traumatologie · 2025
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  8. Robotic-assisted versus conventional total knee arthroplasty: a systematic review and meta-analysis of randomized controlled trials.European journal of orthopaedic surgery & traumatology : orthopedie traumatologie · 2024
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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.

Satit ThiengwittayapornDepartment of Orthopaedics, Faculty of Medicine Vajira Hospital, Navamindradhiraj University, 681 Samsen Rd, Dusit, Bangkok, 10300, Thailand. satitthh@hotmail.com.ORCID http://orcid.org/0000-0002-5157-2688
Pinyong UthaitasDepartment of Orthopaedics, Faculty of Medicine Vajira Hospital, Navamindradhiraj University, 681 Samsen Rd, Dusit, Bangkok, 10300, Thailand.
Chaipipathn SenwiruchDepartment of Orthopaedics, Faculty of Medicine Vajira Hospital, Navamindradhiraj University, 681 Samsen Rd, Dusit, Bangkok, 10300, Thailand.
Natthapong HongkuDepartment of Orthopaedics, Faculty of Medicine Vajira Hospital, Navamindradhiraj University, 681 Samsen Rd, Dusit, Bangkok, 10300, Thailand.
Revit TunyasuwanakulDepartment of Orthopaedics, Faculty of Medicine Vajira Hospital, Navamindradhiraj University, 681 Samsen Rd, Dusit, Bangkok, 10300, Thailand.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeThe study compared a novel imageless robotic-assisted total knee arthroplasty (RATKA) and conventional TKA by considering (1) radiological outcomes, (2) outliers of radiological outcomes, and (3) learning curve.

methodsThis prospective randomized controlled study performed by a single surgeon evaluated 152 patients (152 knees): 75 patients undergoing RATKA and 77 patients undergoing conventional TKA. Mechanical alignment, radiological implant positioning, and outliers were analyzed for radiological outcomes. Cumulative summation (CUSUM) analysis was used to assess the learning curve for operative time in RATKA.

resultsThe RATKA had significantly better accuracy of knee alignment and component positioning than conventional TKA. The hip-knee-ankle axis and implant position outliers were significantly lower in the RATKA, with 94.7% of patients had achieved an overall mechanical alignment within 3° of a neutral mechanical axis. Changes in posterior condylar offset and joint line were significantly lower in the RATKA. A learning curve of seven cases for operative time was obtained for the RATKA.

conclusionThe imageless RATKA has better alignment accuracy with a short learning curve; thus, it presents an attractive option for TKA.

Indexed as

Arthroplasty, Replacement, KneeRobotic Surgical ProceduresHumansKnee JointLearning CurveProspective StudiesCumulative summation analysisImageless robotic-assisted total knee arthroplastyLearning curveMechanical alignmentRobotic-assisted total knee arthroplasty

Identifiers

PMID34392382

What OpenQuestion holds

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Registered trials

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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.