Evidence map›Paper›PMID 26888574›Full record

ArticleJournal of orthopaedic surgery and research2016

Predominance of synovial sensory nerve fibers in arthrofibrosis following total knee arthroplasty compared to osteoarthritis of the knee.

Franz Xaver Koeck, Miriam Schmitt, Clemens Baier, Hubert Stangl, Johannes Beckmann, Joachim Grifka, Rainer H Straub

Open access · goldAbstract readComparative Study
In one paragraph

Article in Journal of orthopaedic surgery and research, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.

0numbers the graph read from it
0cells of the map it votes in
15citing papers in PubMed
2.5field-weighted citation impact, top 12% 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.

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

15 citing papers in PubMed, 28 citations in OpenAlex.

  1. Human Knee as an Organ: Joint Tissue Collection, Processing, and Scoring for Multimodal Analyses.Laboratory investigation; a journal of technical methods and pathology · 2026
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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

7 authors at 3 institutions in 1 country.

Franz Xaver KoeckMedArtes - Private Orthopaedic Clinic, Regensburger Strasse 13, 93073, Neutraubling, Germany. f.x.koeck@medartes.de.
Miriam SchmittLaboratory of Experimental Rheumatology and Neuroendocrine Immunology, Department of Internal Medicine I, University Hospital Regensburg, Franz-Josef-Strauss-Allee 11, 93042, Regensburg, Germany. miriam_schmitt@web.de.
Clemens BaierDepartment of Orthopedic Surgery, University of Regensburg, Kaiser-Karl-V.-Allee 3, 93073, Bad Abbach, Germany. joachim.grifka@klinik.uni-regensburg.de.
Hubert StanglLaboratory of Experimental Rheumatology and Neuroendocrine Immunology, Department of Internal Medicine I, University Hospital Regensburg, Franz-Josef-Strauss-Allee 11, 93042, Regensburg, Germany. hubert.stangl@klinik.uni-regensburg.de.
Johannes BeckmannSportklinik Stuttgart, Taubenheimstrasse 8, 70372, Stuttgart, Germany. johannes.beckmann@sportklinik-stuttgart.de.
Joachim GrifkaDepartment of Orthopedic Surgery, University of Regensburg, Kaiser-Karl-V.-Allee 3, 93073, Bad Abbach, Germany. joachim.grifka@klinik.uni-regensburg.de.
Rainer H StraubLaboratory of Experimental Rheumatology and Neuroendocrine Immunology, Department of Internal Medicine I, University Hospital Regensburg, Franz-Josef-Strauss-Allee 11, 93042, Regensburg, Germany. rainer.straub@klinik.uni-regensburg.de.
University Hospital Regensburg · DEUniversity of Regensburg · DEKlinikum Stuttgart · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundSo far, there exists no golden standard for the treatment of arthrofibrosis (AF) following total knee arthroplasty (TKA). Although pain is a hallmark of AF, nociceptive nerve fibers have never been investigated in affected joint tissue.

methodsA total of 24 patients with osteoarthritis (OA) of the knee (n = 12) and post-TKA AF of the knee (n = 12) were included. Along evaluation of typical clinical signs and symptoms by using the Knee Society Clinical Rating System (KSS), the Knee Injury and Osteoarthritis Outcome Score (KOOS), and the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC index), the innervation of joint tissue was studied by semiquantitative immunofluorescence of nerve fibers.

resultsPatients with AF compared to OA had a lower KSS and lower KOOS. In all compartments (anterior, medial, and lateral recesses), the density of synovial sympathetic nerve fibers was significantly higher in OA compared to AF, which was also true for the density of sensory nerve fibers in the medial and lateral recesses. In synovial tissue of the anterior recess of patients with AF compared to OA, the density of nociceptive sensory nerve fibers was significantly higher relative to sympathetic nerve fibers. This was similarly observed in the neighboring infrapatellar fat pad of the knee.

conclusionsSimilar as in many painful musculoskeletal diseases, this study indicates that patients with arthrofibrosis of the knee after TKA demonstrate a preponderance of profibrotic sensory nerve fibers over antifibrotic sympathetic nerve fibers. This could serve as a starting point for AF therapy with specific antifibrotic pain medication or regional anesthetic techniques.

Indexed as

AgedAged, 80 and overArthroplasty, Replacement, KneeFemaleFibrosisHumansKnee JointMaleMiddle AgedNerve FibersNociceptorsOsteoarthritis, KneeSeverity of Illness IndexSubstance PSynovial MembraneSubstance P

Identifiers

PMID26888574
PMCPMC4758104
OpenAlexW2287275893

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

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.