Purpose
To analyze reporting bias in the form of spin present in systematic reviews and meta-analyses related to medial patellofemoral ligament reconstruction (MPFLR).
Methods
Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines, systematic reviews were collected from PubMed, Web of Science, and Embase using the search “medial patellofemoral ligament reconstruction” or “MPFLR” AND “systematic review” OR “meta-analysis.” Abstracts were assessed for 15 common spin types. A Measurement Tool to Assess Systematic Reviews 2 (AMSTAR 2) was used to evaluate the quality of the studies. Characteristics such as Preferred Reporting Items for Systematic Reviews and Meta-Analyses adherence, publication year, and level of evidence were analyzed. Associations between these factors and spin presence or type were determined using statistical tests, including t tests, analysis of variance, Fisher tests, and Spearman rank coefficients.
Results
The initial database search identified 1,044 studies, of which a total of 57 studies were included. Spin was present in the abstract in 51 of 57 studies (89.5%). Each type of spin was observed in at least 1 study’s abstract with the exceptions of spin types 1, 7, 13, and 15. The 3 most common types were type 5 (48/57, 84.2%), followed by type 3 (32/57, 56.1%) and type 9 (30/57, 52.6%). Of the included studies, 91.2% received a critically low AMSTAR 2 confidence rating, and only 5.3% reported a conflict of interest. There was a statistically significant negative correlation between the numerical AMSTAR 2 rating and the presence of spin (P < .01).
Conclusions
Most systematic reviews on MPFLR received critically low AMSTAR 2 ratings, reflecting the poor quality of evidence in this area. Nearly 90% of abstracts exhibited at least 1 type of spin, with spin types 3, 5, and 9 being the most common, suggesting a tendency to overstate the efficacy of MPFLR for patellar instability.
Level of Evidence
Level IV, systematic review of Level II-IV studies.
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