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A Predictive Score for Infantile Blount Disease Recurrence After Tibial Osteotomy
Nath Adulkasem1, Jidapa Wongcharoenwatana, Thanase Ariyawatkul
1Department of Orthopaedic Surgery, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand.
Insights
A new prediction score accurately identifies infantile Blount disease recurrence after tibial osteotomy. This tool helps physicians inform prognosis and guide interventions for better patient outcomes.
Area of Science:
- Orthopedics
- Pediatric Orthopedics
- Surgical Outcomes Research
Background:
- Infantile Blount disease is a developmental condition affecting the tibia.
- Tibial osteotomy is a common surgical intervention for this condition.
- Predicting recurrence after surgery is crucial for patient management.
Purpose of the Study:
- To identify predictors of infantile Blount disease recurrence post-tibial osteotomy.
- To develop and validate a predictive score for disease recurrence.
Main Methods:
- Retrospective cohort study of 101 extremities from 58 patients (1998-2020).
- Analysis of clinical and radiographic parameters for recurrence prediction.
- Multivariable logistic regression to develop a predictive score.
Main Results:
- Recurrence observed in 14.9% of cases.
- Key predictors identified: age, Langenskiöld stage, LaMont classification, and specific preoperative angles.
- Developed score (age <42 months, LaMont C, medial metaphyseal beak angle >128°) showed excellent predictive performance (AUC=0.87).
Conclusions:
- The developed predictive score accurately forecasts infantile Blount disease recurrence after tibial osteotomy.
- This tool aids clinicians in prognosis, follow-up awareness, and planning interventions.
Introduction And Objective:
Several predictive factors for infantile Blount disease recurrence after tibial osteotomy were discovered. This study aimed to examine and utilize various predictors to develop a prediction score for infantile Blount disease recurrence after tibial osteotomy.
Methods:
We conducted a retrospective cohort study of infantile Blount disease patients who underwent tibial osteotomy between January 1998 and December 2020. Potential predictors, including clinical and radiographic parameters, were examined for their association with the disease recurrence after receiving tibial osteotomy. A predictive score was subsequently developed based on those potential predictors through multivariable logistic regression modeling.
Results:
A total of 101 extremities diagnosed with infantile Blount disease from 58 patients who underwent tibial osteotomy were included. Of those, 15 extremities (14.9%) recurred. Univariable logistic regression analysis identified age older than 42 months [odds ratio (OR)=4.28; P =0.026], Langenskiöld classification stage III (OR=9.70; P <0.001), LaMont classification type C (OR=15.44; P <0.001), preoperative femorotibial angle <-14 degrees (OR=4.21, P =0.021), preoperative metaphyseal-diaphyseal angle >16 degrees (OR=8.61, P =0.006), preoperative medial metaphyseal slope angle >70 degrees (OR=7.56, P =0.001), and preoperative medial metaphyseal beak angle >128.5 degrees (OR=13.46, P =0.001) as potential predictors of infantile Blount disease recurrence after tibial osteotomy. A predictive score comprised of age younger than 42 months, LaMont classification type C, and medial metaphyseal beak angle >128 degrees demonstrated an excellent predictive performance (area under the receiver operating characteristic curve =0.87), good calibration, and high internal validity.
Conclusions:
Our developed predictive score accurately predicted infantile Blount disease recurrence after tibial osteotomy. The results from our developed prediction tool allow physicians to inform prognosis, increase awareness during the follow-up period, and consider additional interventions to prevent disease recurrence.
Level Of Evidence:
Level II.
