Original Article Management of Rocker-Bottom Deformity During Ponseti Treatment of Congenital Idiopathic Clubfoot
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Int J Clin Exp Med 2019;12(12):13805-13811 www.ijcem.com /ISSN:1940-5901/IJCEM0100125 Original Article Management of rocker-bottom deformity during Ponseti treatment of congenital idiopathic clubfoot Wanglin Zhang, Haoqi Cai Department of Orthopedics, Shanghai Children’s Medical Center, School of Medicine, Shanghai Jiaotong Univer- sity, Shanghai 200127, China Received July 25, 2019; Accepted November 6, 2019; Epub December 15, 2019; Published December 30, 2019 Abstract: Objective: To investigate the clinical and radiographic presentations and management of rocker-bottom deformity during Ponseti treatment of congenital idiopathic clubfoot. Methods: In this retrospective study, 6 pa- tients (9 feet) with idiopathic clubfoot compared to 185 outpatients (276 feet) admitted to Shanghai Children’s Medical Center between August 2015 and July 2016 were recruited. Ponseti casting plus percutaneous Achilles tenotomy with/without Kirschner wire internal fixation of the talo-navicular joint were performed, followed by brace use. Dimeglio score, lateral radiograph of the foot in maximal dorsiflexion (the tibiocalcaneus angle, the mean calcaneus-fifth metatarsal angle and the mean talo-first metatarsal angle) and previous treatment data were re- corded. Results: Among the 6 clubfoot patients (9 feet), 3 were male and 3 female. Three patients had bilateral clubfeet, 5 cases of right clubfoot and 4 cases of left clubfoot. All patients were aged 5-19 months. Lateral radio- graph showed that the mean tibio-calcaneus angle during postoperative follow-up was (71.23±13.62)°, significantly lower compared with preoperative angle of (82.41±15.10)°. The postoperative mean calcaneus-fifth metatarsal angle was (24.98±8.81)°, significantly lower than (43.77±13.41)° before operation. The postoperative mean talo- first metatarsal angle was (22.82±11.62)°, considerably lower compared with (34.77±6.20)° before surgery. At the final follow-up, eight clubfeet were successfully corrected and merely one clubfoot was not effectively treated. Conclusions: Rocker-bottom deformity should be identified during Ponseti management of congenital idiopathic clubfoot. Lateral radiographs of the foot in the maximal dorsiflexion can assist the diagnosis. Achilles tenotomy prob- ably lowers the risk of rocker-bottom deformity. Keywords: Clubfoot, rocker-bottom deformity, Ponseti method, pediatrics Introduction tendon releasing to avoid the rocker-bottom deformity [3, 4]. The rocker-bottom deformity Congenital clubfoot is one of the most common has not been reported by Professor Ponseti as birth defects in the musculoskeletal system, one of the complications in his clubfoot studies. whereas the underlying pathogenesis remains That is why it is regarded as an iatrogenic elusive. Conservative treatment is primarily disease. adopted during the early stage [1, 2], of which the Ponseti method is currently recognized as However, favorable clinical results not only the first therapeutic option [3]. Although early depend upon the strict adherence to the correction yields a high success rate and good Ponseti protocol, but also rely on detailed qual- repeatability, it still faces the issues of residual ity controls throughout all three stages of inter- deformity and high recurrence in certain vention including cast, tenotomy and brace patients [4-7]. management [8, 9]. Nevertheless, one study of radiographic images during Ponseti treatment Through thorough investigation of subtalar of clubfoot has identified 7 patients presenting joint biomechanics, Professor Ponseti has with rocker-bottom deformity among 87 cases attempted to utilize a specialized manual and of Ponseti treatment for clubfoot. Among the 7 well-modeling cast to achieve the successful cases, 6 feet were significantly improved after correction, and adopt percutaneous Achilles Achilles tendon release and only one foot was Rocker-bottom deformity during Ponseti treatment not effectively corrected [10]. Because the feet ments were performed to confirm the diagno- of infants mostly consist of cartilage, plain X-ray sis of rocker-bottom deformity in the pediatric can only provide extremely limited information. patients. 1) For continuous fixation, arch sup- In addition, X-ray evaluation of infantile feet port clubfoot plaster casts were changed once should be performed with caution due to the per week for 4 consecutive weeks to restore damage caused by radiation exposure [11, 12]. the midfoot alignment. 2) Under general anes- Plain X-ray of the feet in the maximum dor- thesia, fluoroscopy of the lateral talo-navicular siflexion position has been proven to provide joint was performed with the feet in the maxi- significant guidance for the treatment of infan- mal dorsiflexion position. If the talo-navicular tile clubfoot [13-15]. The incidence of mild rock- joint was dorsally dislocated, it was manually er-bottom deformity during Ponseti treatment reduced and fixed with a 1.6-mm diameter has been identified by X-ray evaluation of the Kirschner wire. Then, percutaneous Achilles feet [10], suggesting that plain X-ray of the feet tenotomy was performed, as described by can identify potential abnormalities that are Dobbs et al. [16]. If the talo-navicular joint was difficult to detect by clinical observation, such properly aligned, the percutaneous Achilles as mild rocker-bottom deformity. tenotomy alone was sufficient. 3) The ankle joint was held in a neutral position with a long- We hypothesize that the risk of rocker-bottom leg cast with dorsiflexion at 15° and arch sup- deformity occurring during Ponseti treatment port cast for 4 consecutive weeks. The hard- still exists. Nevertheless, the underlying mech- ware was removed under local anesthesia, and anisms are still unknown, and relevant clinical another cast was placed for 2 consecutive manifestations and risk factors have been rare- weeks. Those without internal-fixation were ly studied. Therefore, the present study aimed fixed with the final cast for 6 consecutive to investigate the clinical and radiographic weeks. 4) The original Ponseti external brace manifestations of rocker-bottom deformity dur- was refitted. Brace management was adopted ing Ponseti management of idiopathic clubfoot initially for 23 h/day for 3 months, followed by and the preliminary treatment results were pre- wearing only while sleeping for at least 2 years. sented as follows. Follow-up Materials and methods After corresponding treatment, all patients Study design were subject to follow-up once a year for 2 years. During the follow-up, the appearance In this retrospective study, clinical data of chil- and function of bilateral feet were evaluated. dren diagnosed with clubfoot admitted to the The compliance of wearing the brace was also clubfoot specialty outpatient clinic at Shanghai observed and recorded. Lateral radiographs Children’s Medical Center between August 1, were taken starting at 6 months after corre- 2015, and July 31, 2016 were retrospectively sponding treatment for 2 years, and then once analyzed. The inclusion criteria were: 1) diagno- a year for 3 years afterwards. sis with congenital clubfoot; and 2) a brace is being fitted during Ponseti treatment. The Evaluation methods exclusion criteria were: 1) complications with other musculoskeletal system disorders; 2) The Dimeglio score system has become the those with clear nervous system disorders; 3) most universally adopted classification system those receiving other interventional therapies; of the severity of deformity [17]. The indepen- and 4) those failing to complete follow-up treat- dent sagittal and total scores were recorded. ment or with incomplete records from at least Medical history of each patient was extracted 1-year follow-up. The study was approved by the from the medical charts. ethics committee of the Shanghai Children’s Medical Center. Written informed consent was During the physical examinations of the ankle obtained from the parents of patients. dorsi-flexion, forefoot position was carefully checked in the neutral and supination posi- Treatment procedures tions. If the dorsiflexion angle in the forefoot supination position was smaller compared with After notifying the family members and obtain- that in the forefoot neutral position, the patient ing their informed consent, the following treat- is suspected to have rocker-bottom deformity. 13806 Int J Clin Exp Med 2019;12(12):13805-13811 Rocker-bottom deformity during Ponseti treatment Figure 1. Radiograph of rocker-bottom deformity. A. Lateral radiograph of the feet in the maximal dorsiflexion posi- tion. B. Radiograph of rocker-bottom deformity. C. The measurement of the tibio-calcaneal (Ti-C), calcaneo-fifth metatarsal (C-M5), and talo-first metatarsal (Ta-M1) angles. Hence, radiographic examinations of this pati- (SD). Paired t-test was utilized to statistically ent should be considered. compare the differences between the angles measured before and after treatment. A P value For radiographic examinations, lateral radio- of less than 0.05 was considered as statisti- graphs of bilateral feet were taken with the cally significant. feet in the maximal dorsiflexion position Figure( 1A). Projection methods were conducted by Results using the lateral foot radiography technique as previously described [18]. Each of the two feet Baseline characteristics was supported and maintained with the maxi- mal flexion of the ankle joint by the parents or During the study, 276 feet from 185 clubfoot guardians of the patient. After radiography, the children were examined at the