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Rectus femoris transfer in children with cerebral palsy: comparing a propensity score-matched observational study to
Michael H Schwartz1,2, Andrew J Ries1
1Center for Gait and Motion Analysis, Gillette Children's Specialty Healthcare, St Paul, MN, USA.
Insights
Propensity score matching accurately estimates rectus femoris transfer (RFT) effects in children with cerebral palsy (CP) undergoing surgery. This method validates RFT surgery outcomes and can be applied to other single-event multilevel surgeries (SEMLS).
Area of Science:
- Orthopedics
- Pediatric Surgery
- Biostatistics
Background:
- Cerebral palsy (CP) affects motor function, often requiring surgical interventions like rectus femoris transfer (RFT).
- Single-event multilevel surgery (SEMLS) aims to correct multiple impairments simultaneously.
- Accurate estimation of treatment effects is crucial for optimizing surgical interventions in CP.
Purpose of the Study:
- To evaluate the efficacy of propensity score matching in observational studies.
- To determine if this method can accurately estimate causal treatment effects of RFT within SEMLS.
- To compare these estimates with results from a randomized controlled trial (RCT).
Main Methods:
- Utilized a large clinical database for propensity score derivation.
- Employed propensity score matching to create a comparable patient cohort.
- Compared outcomes between the matched observational cohort and a published RCT.
Main Results:
- The observational study and RCT cohorts showed clinically insignificant differences in key gait parameters.
- Postoperative changes in the observational study closely mirrored those from the RCT.
- Confidence intervals for outcomes largely overlapped, indicating consistent results.
Conclusions:
- Propensity score matching is a valid and accurate method for estimating causal treatment effects of RFT in ambulatory children with CP.
- This methodology can be extended to assess other SEMLS components in this population.
Aim:
To test whether an observational study employing propensity score matching could accurately estimate the causal treatment effects of rectus femoris transfer (RFT) as part of single-event multilevel surgery (SEMLS) in ambulatory children with cerebral palsy.
Method:
We used a large clinical database to derive a propensity score for treatment assignment (SEMLS±RFT) and used this score to generate a matched patient cohort. We compared the causal treatment effects estimated from this matched cohort with a previously published randomized controlled trial (RCT).
Results:
The treated arms of the observational study and RCT were well matched. There were 129 limbs (81 males) with a mean age of 10 years 7 months (4y 7mo) in the treated arm of the observational study, and 129 limbs (68 males) with a mean age of 10 years 2 months (3y 9mo) in the control arm of the observational study. Differences between the observational study and RCT cohorts were clinically meaningless for knee flexion kinematics (1-4°), timing of knee angle extrema (<3% gait cycle), and speed (<5mm/s). Postoperative changes in the observational study matched those from the RCT. All but one of the observational study confidence intervals were completely contained within the corresponding RCT confidence interval; there were no meaningful differences in magnitude or sign of key outcomes related to stiff knee gait.
Interpretation:
Propensity score matching is an accurate method for estimating the causal treatment effects of RFT as part of an SEMLS. It seems reasonable to extend this approach to other common components of SEMLS treatment in this population.
What This Paper Adds:
Propensity score matching is an accurate method for estimating the causal treatment effects of rectus femoris transfer (RFT) in ambulatory children with cerebral palsy (CP). The causal treatment effects for RFT surgery in ambulatory children diagnosed with CP were validated.
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