Evidence map›Paper›PMID 33963878›Full record

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

Femoral tunnel malposition is the most common indication for revision medial patellofemoral ligament reconstruction with promising early outcomes following revision reconstruction: a systematic review.

Madison Walker, Larissa Maini, Jeffrey Kay, Ali Siddiqui, Mahmoud Almasri, Darren de Sa

Abstract readCase ReportsSystematic Review
PubMed Publisher
In one paragraph

Synthesis 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 26 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
26citing papers in PubMed, 1 pooled it
2.6field-weighted citation impact, top 10% 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

26 citing papers in PubMed, 1 synthesis or guideline pooled it, 45 citations in OpenAlex.

  1. Pooled it
  2. A Comprehensive Guide to Revision Medial Patellofemoral Ligament Reconstruction in Adolescents.Journal of the Pediatric Orthopaedic Society of North America · 2026
    Review
  3. Article
  4. Article
  5. Article
  6. Review
  7. Article
  8. Article
  9. Article
  10. Article
  11. [Research progress of Schöttle's method for femoral tunnel localization in medial patellofemoral ligament reconstruction].Zhongguo xiu fu chong jian wai ke za zhi = Zhongguo xiufu chongjian waike zazhi = Chinese journal of reparative and reconstructive surgery · 2024
    Review
  12. Article
  13. [Research progress on femoral attachment positioning during medial patellofemoral ligament reconstruction].Zhongguo xiu fu chong jian wai ke za zhi = Zhongguo xiufu chongjian waike zazhi = Chinese journal of reparative and reconstructive surgery · 2024
    Review
  14. Article
  15. Article
  16. Article
  17. Patellofemoral Instability in the Pediatric Population.Current reviews in musculoskeletal medicine · 2023
    Review
  18. Article
  19. Article
  20. [Mid-term effectiveness analysis of combined knee extensor mechanism realignment with bone anchor for recurrent patella dislocation].Zhongguo xiu fu chong jian wai ke za zhi = Zhongguo xiufu chongjian waike zazhi = Chinese journal of reparative and reconstructive surgery · 2022
    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 at 2 institutions in 2 countries.

Madison WalkerMichael G. DeGroote School of Medicine, McMaster University, Hamilton, ON, Canada.
Larissa MainiMichael G. DeGroote School of Medicine, McMaster University, Hamilton, ON, Canada.
Jeffrey KayDivision of Orthopaedic Surgery, Department of Surgery, McMaster University Medical Centre, 1200 Main St West 4E14, Hamilton, ON, L8N 3Z5, Canada.
Ali SiddiquiFaculty of Health Sciences, McMaster University, Hamilton, ON, Canada.
Mahmoud AlmasriDivision of Orthopaedic Surgery, Department of Surgery, McMaster University Medical Centre, 1200 Main St West 4E14, Hamilton, ON, L8N 3Z5, Canada.
Darren de SaDivision of Orthopaedic Surgery, Department of Surgery, McMaster University Medical Centre, 1200 Main St West 4E14, Hamilton, ON, L8N 3Z5, Canada. darren.desa@medportal.ca.
McMaster University · CAMcMaster University Medical Centre · CA

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeThe purpose of this study was to identify the causes of failure of previous medial patellofemoral ligament reconstruction (MPFL-R), and to furthermore report the surgical techniques available for MPFL revision surgery.

methodsFour databases [PubMed, Ovid (MEDLINE), Cochrane Database, and EMBASE] were searched until September 29, 2020 for human studies pertaining to revision MPFL. Two reviewers screened the literature independently and in duplicate. Methodological quality of the included studies was assessed using the Methodological Index for Non-Randomized Studies (MINORS) criteria, or the CAse REport guidelines (CARE), where appropriate.

resultsFourteen studies (one level II, one level III, two level IV, ten level V) were identified. This search resulted in a total of 76 patients with a mean age (range) of 22 (14-39) years. The patients were 75% female with a mean (range) time to revision of 24.1 (1-60) months and mean (range) follow-up of 36.2 (2-48) months. The most common indication for revision surgery was malpositioning of the femoral tunnel (38.1%), unaddressed trochlear dysplasia (18.4%), patellar fracture (11.8%). Femoral tunnel malposition was typically treated via revision MPFL-R with quadriceps tendon or semitendinosus autograft and may retain the primary graft if fixation points were altered. Unaddressed trochlear dysplasia was treated with deepening trochleoplasty with or without revision MPFL-R, and patella fracture according to the nature of the fracture pattern and bone quality. Though generally, outcomes in the revision scenario across all indications were inferior to those post-primary procedure, overall, revision patients demonstrated positive improvements in pain and instability symptoms. Transverse patella fractures treated with debridement and filling with demineralized bone matrix if required with further fixation according to the fracture pattern.

conclusionThe most common causes of MPFL failure in literature published to date, in order of decreasing frequency, are: malposition of the femoral tunnel, unaddressed trochlear dysplasia, and patellar fracture. Although surgical techniques of revision MPFL-R to manage these failures were varied, promising outcomes have been reported to date. Larger prospective comparative studies would be useful to clarify optimal surgical management of MPFL-R failure at long-term follow-up. LEVEL OF EVIDENCE: IV.

Indexed as

Fractures, BoneJoint InstabilityKnee InjuriesPatellar DislocationPatellofemoral JointAdultFemaleHumansLigaments, ArticularMalePatellaProspective StudiesYoung AdultMPFLMPFL reconstructionMPFL revisionPatella stabilization

Identifiers

PMID33963878
OpenAlexW3157355380

What OpenQuestion holds

Textmetadata
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.