ArticleKnee surgery, sports traumatology, arthroscopy : official journal of the ESSKA2017
A matched-pair comparison of inlay and onlay trochlear designs for patellofemoral arthroplasty: no differences in clinical outcome but less progression of osteoarthritis with inlay designs.
Article in Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 36 papers, 4 of them syntheses that pooled 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.
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.
Who cites it
36 citing papers in PubMed, 4 syntheses or guidelines pooled it, 73 citations in OpenAlex.
- Patellofemoral arthroplasty with onlay prosthesis leads to higher rates of osteoarthritis progression than inlay design implants: a systematic review.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2023Pooled it
- Return to the operating room after patellofemoral arthroplasty versus total knee arthroplasty for isolated patellofemoral arthritis-a systematic review.International orthopaedics · 2019Pooled it
- Focal metallic inlay resurfacing prosthesis for the treatment of localized cartilage defects of the femoral condyles: a systematic review of clinical studies.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2018Pooled it
- Survivorship and functional outcomes of patellofemoral arthroplasty: a systematic review.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2017Pooled it
- [Patellofemoral arthroplasty].Operative Orthopadie und Traumatologie · 2017Trial
- A two to fifteen year follow-up case series of ninety one patients after onlay patellofemoral arthroplasty highlighting the impact of preoperative symptoms and mental health.International orthopaedics · 2026Article
- Systematic review and meta-analysis of implant-specific outcomes in inlay and onlay patellofemoral arthroplasty for isolated patellofemoral osteoarthritis.Journal of experimental orthopaedics · 2025Review
- Outcomes After Patellofemoral Arthroplasty With the Arthrex iBalance-A Third Generation Implant.Arthroplasty today · 2025Article
- [Patellofemoral joint replacement: onlay or inlay?]Orthopadie (Heidelberg, Germany) · 2025Article
- High survivorship and excellent functional outcome in third-generation patellofemoral arthroplasty.Journal of experimental orthopaedics · 2025Article
- Improved clinical outcomes and a low rate of failure following implantation of a patellofemoral inlay arthroplasty model featuring an enlarged lateral offset - a prospective clinical and radiographic evaluation at short term follow-up.Archives of orthopaedic and trauma surgery · 2025Article
- Clinical outcomes of patellofemoral arthroplasty: robotic assistance produces superior short and mid-term outcomes.Archives of orthopaedic and trauma surgery · 2024Article
- Robotic-assisted patellofemoral arthroplasty provides excellent implant survivorship and high patient satisfaction at mid-term follow-up.International orthopaedics · 2024Article
- Standard Versus Dysplastic Inlay Implant for Patellofemoral Arthroplasty: Surgical Technique and Decision-Making.Arthroscopy techniques · 2024Article
- Short-term Functional Outcomes and Complications of Custom Patellofemoral Arthroplasty.Arthroplasty today · 2024Article
- The landscape of patellofemoral arthroplasty research: a bibliometric analysis.Arthroplasty (London, England) · 2023Article
- Revision of inlay resurfacing prosthesis with patellar realignment surgery and a new inlay prosthesis for persistent patellofemoral pain und patella subluxation.Archives of orthopaedic and trauma surgery · 2023Article
- PATELLOFEMORAL KNEE PROSTHESIS - WHY IS IT RARELY USED?Acta clinica Croatica · 2023Review
- Patellofemoral Arthroplasty Is an Efficient Strategy for Isolated Patellofemoral Osteoarthritis with or without Robotic-Assisted System.Journal of personalized medicine · 2023Article
- The lack of retropatellar resurfacing at index surgery is significantly associated with failure in patients following patellofemoral inlay arthroplasty: a multi-center study of more than 260 patients.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2022Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
7 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
purposeTo compare clinical and radiographic results after isolated patellofemoral arthroplasty (PFA) using either a second-generation inlay or onlay trochlear design. The hypothesis was that an inlay design will produce better clinical results and less progression of tibiofemoral osteoarthritis (OA) compared to an onlay design.
methodsFifteen consecutive patients undergoing isolated PFA with an onlay design trochlear component (Journey™ PFJ, Smith & Nephew) were matched with 15 patients after isolated PFA with an inlay design trochlear component (HemiCAP
resultsConversion to total knee arthroplasty was necessary in one patient within each group, leaving 14 patients per group for final evaluation. The mean follow-up was 26 months in the inlay group and 25 months in the onlay group (n.s.). Both groups displayed significant improvements of all clinical scores (p < 0.05). No significant differences were found between the two groups with regard to the clinical outcome and reoperation rate. No significant progression of tibiofemoral OA was observed in the inlay group, whereas 53 % of the onlay group showed progression of medial and/or lateral tibiofemoral OA (p = 0.009).
conclusionIsolated PFA using either a second-generation inlay or onlay trochlear component significantly improves functional outcome scores and pain. The theoretical advantages of an inlay design did not result in better clinical outcome scores; however, progression of tibiofemoral OA was significantly less common in patients with an inlay trochlear component. This implant design may therefore improve long-term results and survival rates after isolated PFA. LEVEL OF EVIDENCE: III.
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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.