1. Ki Hyuk Sung, MD Department of Orthopaedic Surgery Seoul National University Bundang Hospital Talar morphologic changes after tendo- Achilles lengthening for long-standing equinus deformity in patients with residual poliomyelitis

2. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Introduction Coronal angular deformity of the lower limb is a common finding in growing children Permanent (irreversible) hemiepiphysiodesis Temporary (reversible) hemiepiphysiodesis using staples, percutaneous screws, or a tension band plate (eight-plate)

3. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Introduction Measuring the rate of correction is necessary to predict the time to end point The rate of angular correction has been calculated simply by averaging. Other factors (age, surgical method, direction of deformity, etiology, physis) must be considered while estimating the rate of correction

4. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Introduction A linear mixed model (LMM) is useful in settings where multiple correlated measurements are made on the same statistical units LMM consists of fixed effects and random effects Estimation of the correction rate by using a mixed model application may confer more practical information to clinicians

5. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Purpose To investigate the talar morphologic changes after TAL for long-standing equinus deformity in patients with RP To investigate whether the severity of preoperative equinus deformity affect occurrence of symptomatic anterior impingement.

6. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Material and methods

7. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Inclusion criteria Consecutive patients with residual poliomyelitis, who underwent tendo-Achilles lengthening for equinus foot deformity since 2003 Patients who had preoperative and postoperative weight bearing lateral foot-ankle radiographs Patients with a minimum follow-up of 6 months

8. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Exclusion criteria Patients with inadequate foot-ankle radiographs for measurement Patients with history of previous foot surgery Patients who had concomitant anterior bony spur excision with TAL

9. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Radiographic measurement Lateral foot weight bearing radiograph –Talocalcaneal angle –Plantigrade angle –McDermott grade –Presence of anterior blocking spur

10. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Talocalcaneal angle

11. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Plantigrade angle

12. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL McDermott grade –grade 1, anterior tibial spur measuring less than 3mm –grade 2, anterior tibial spur measuring more than 3mm –grade 3, anterior tibial spur with secondary talar spur (kissing lesion) –grade 4, panarthritis

13. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL McDermott grade

14. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Anterior blocking spur

15. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Statistical analysis Comparison between preoperative and postoperative McDermott grade –Wilcoxon signed ranks test Comparison of preoperative radiographic measurements between the patients with and without anterior ankle pain, and between the patients with and without anterior blocking spur –Independent t-test

16. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Results

17. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Patients demographics and radiographic measurements Gender (M / F)13 / 14 Age at operation (year)43.8±9.4 (range 21.7 to 63.3) Right/ Left17 / 10 Follow-up duration (year)2.9±2.2 (range 0.6 to 8.4) Foot deformity E/ EC/ EV/ ECV/ EPV7/ 2/ 2/ 14/ 2 Preoperative talocalcaneal angle (˚)78.5±14.2 Preoperative plantigrade angle (˚)99.5±14.3 McDermott grade * Preoperative0 (range, 0 to 4) Latest follow-up3 (range, 0 to 4) p-value<0.001

18. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Comparison of preoperative radiographic measurements between the patients with anterior ankle pain and without anterior ankle pain after tendo-Achilles lengthening Parameters Patients without anterior blocking spur Patients with anterior blocking spur Mean difference p-value No. of patients1314 Talocalcaneal angle (˚)70.9±12.685.5±12.314.5±4.80.006 Plantigrade angle (˚)92.5±13.9106.0±11.713.5±4.90.011

19. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Comparison of preoperative radiographic measurements between the patients with anterior ankle blocking and without anterior ankle blocking after tendo-Achilles lengthening Parameters Patients without anterior blocking spur Patients with anterior blocking spur Mean difference p-value No. of patients189 Talocalcaneal angle (˚)73.0±12.289.5±11.716.5±4.90.003 Plantigrade angle (˚)93.6±12.0111.3±11.517.6±4.80.001

20. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Conclusion Most of patients with RP showed the anterior ankle impingement after TAL for long-standing equinus deformity The presence of symptomatic anterior ankle impingement was significantly associated with the severity of the equinus deformity.

21. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL Conclusion Therefore, for the RP patients with severe long-standing equinus deformity, surgeons should consider the possibility of subsequent anterior procedure for anterior impingement after TAL.

22. SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL ◦ SEOUL NATIONAL UNIVERSITY BUNDANG HOSPITAL