Original Investigation

The Effect of Tibialis Anterior Tendon Transfer on Metatarsus Adductus Deformity in Children with Clubfoot

10.4274/imj.galenos.2018.15807

  • Osman Nuri Özyalvaç
  • Akay Kırat
  • Evren Akpınar
  • Yaşar Mahsut Dinçel
  • Barış Özkul
  • Avni İlhan Bayhan

Received Date: 26.12.2017 Accepted Date: 24.07.2018 IMJ 2019;20(1):35-38

Introduction:

Tibialis anterior tendon transfer (TATT) is a common treatment method used in the dynamic supination of the foot due to sequelae or relapse of pes equinovarus (PEV). In this method, the TAT is transferred from its insertion on the medial cuneiform to the lateral cuneiform. Therefore, TATT surgery may have a corrective effect on metatarsus adducus deformity by creating a force vector that pushes the middle of the foot from medial to lateral. However, there is limited literature on the effect of TATT on metatarsus adductus deformity, which is one of the components of clubfoot. The aim of our study was to investigate the effect of TATT on metatarsus adductus deformity.

Methods:

Sixteen feet of 11 patients who underwent TATT with the diagnosis of PEV between 2007-2015 were included in the study. Pre- and postoperative talus-1.metatarsal angle, talocalcaneal angle and 4. metatars-metaphyseal angle were measured on standing antero-posterior radiographs. The correction rate of metatarsus adductus deformity was statistically analyzed.

Results:

After a mean follow-up of 26±15 months, the mean talus – 1st metatarsal angle decreased from 18.8±1 degrees to 10.9±6 degrees, the mean talocalcaneal angle from 22.5 degrees ±8.6 to 24.4±9.3 degrees and the mean 4th metatarsalmetaphyseal angle from 38±14 degrees to 27±11 degrees after TATT. While there were statistically significant radiological corrections in talus – 1st metatarsal angle and 4th metatarsalmetaphyseal angle (p<0.05), there was no statistically significant change in the talocalcaneal angle (p=0.51).

Conclusion:

TATT provides radiological improvement in the metatarsus adductus deformity in children with PEV. The reason for this is that the Tibialis in PEV works as an invertor rather than dorsiflexor/evertor of the ankle. In conclusion, the need for additional surgery for metatarsus adductus deformities in patients undergoing TATT should be reviewed.

Keywords: Clubfoot, metatarsus adductus, pes equinovarus, tibialis anterior tendon transfer

Introduction

Idiopathic clubfoot deformity remains a common pediatric orthopedic problem with an incidence of 1/1000 live birth (1). Successful outcomes can be achieved by serial manipulations and casting following the principles of the Ponseti method. However, relapses can be seen up to 50% in clubfoot treatment, regardless of initial treatment outcomes and correction achieved (2). Relapse is the result of the same pathology that causes the primary deformity and is usually associated with non-compliance with the Ponseti brace protocol (3). Manipulation and re-casting are usually the initial treatments for relapses, but operative treatment may be needed for residual deformities after serial casting (4).

In our study, we hypothesized that by transferring tibialis anterior tendon (TAT) into lateral cuneiform in TAT transfer (TATT) procedure, transforms the supination vector of the TAT to a dorsiflexion vector that may gradually reduce metatarsus adductus deformity in relapsed clubfoot. The purpose of this study was to evaluate the radiologic outcomes and the reducing effects of TATT procedure on metatarsus adductus deformity in relapsed clubfoot.


Methods

After approval (approval number 08/02/2017-67) from the Institutional Review Board of Metin Sabancı Baltalimanı Osteopathic Hospital, a retrospective review of the operative logs from 2006 to 2015 was undertaken to identify all idiopathic clubfoot patients who underwent TATT procedure with at least one year follow-up. Patients who had additional congenital anomalies, neuromuscular disease, and a history of previous surgery other than percutaneous achillotomy were excluded from the study. Also patients who did not have appropriate radiographs and patients with less than one-year follow-up after surgery were excluded from study. Concomitant procedures as achilles tendon lengthening and plantar fasciotomy were noted. Because of the retrospective study design, no approval form was obtained from the patients.

Sixteen feet of 11 patients (2 girls) were identified from the medical records. All patients were initially treated for idiopathic clubfoot deformity with Ponseti method. The decision to perform TATT procedure was based on the clinical findings of dynamic supination gait, which was observed during swing and heel strike phases of gait and accompanying the dynamic heel varus deformity.

All surgeries were performed under general anesthesia and pneumatic tourniquet in supine position by one of the three authors. According to Ponseti and Smoley technique, two incisions were made on dorsal aspect of the foot (2).  First incision was made longitudinally along the path of the TAT near its insertion. After dissecting TAT, the tendon was totally detached from its insertion and a Krackow stitch was placed into the distal portion of the tendon. The second incision was made over lateral cuneiform under fluoroscopic guidance. Then the tendon was pulled out and moved to the lateral side of the foot subcutaneously. Thus, the tendon remains under the retinaculum. Under fluoroscopic guidance, a drill hole, which was  large enough to accommodate the tendon, was made in the middle of the lateral cuneiform. Krackow stitch was threaded into a straight needle and the needle was passed to the plantar aspect of the foot through the drill hole on lateral cuneiform. After that, needle was passed through a felt pad and then through different holes in a button to secure the tendon on the plantar aspect of the foot. Achilles tendon lengthening was performed if the passive dorsiflexion was less than 10 degrees and plantar fasciotomy was performed if needed. A long leg cast was applied keeping the foot in abduction and dorsiflexion for six weeks. Cast and button was removed after six weeks and no additional therapy or bracing was performed thereafter.

Medical records were reviewed to document the age at surgery, gender and follow-up period. Anteroposterior (AP) weight-bearing radiographs of foot and ankle were evaluated on INFINITT Healthcare Picture Archiving Communication System (INFINITT Healthcare Co., Ltd., Seoul, South Korea) by a board certified orthopedic surgeon (Figure 1). Preoperative AP radiographs of the foot and final follow-up radiographs were evaluated and measurements of talus – 1st metatarsal angle (TM1), talocalcaneal angle (TC) and (III) 4th metatarsal – metaphyseal angle (M4M) were made on AP radiographs of foot (Figure 1).


Statistical Analysis

Statistical analysis was performed using Statistical Package for Social Sciences Software version 17 (SPSS, Inc., Armonk, NY, USA). Normality of the variable distribution was tested with Kolmogorov-Smirnov test. Continuous variables were displayed as means ± standard deviation. Continuous variables were compared using the paired sample t-test. p values <0.05 were considered to be statistically significant.


Results

Sixteen feet of 11 relapsed clubfoot patients were evaluated. The mean age at the time of surgery was 4.4±1.1 years. The mean follow-up time was 26±15 months. Measurements of preoperative and final follow up AP radiographs of foot are listed in Table 1.

The mean TM1 angle was decreased from 18.8±1 degrees to 10.9±6 degrees with statistically significant difference (p<0.05). Also the mean M4M angle was decreased from 38±14 degrees to 27±11 degrees with statistically significant difference (p<0.05). Changes in TC angle were not statistically significant (p>0.05).


Discussion

The results of the TATT procedure in the treatment of relapsed clubfoot have been investigated in various studies (2,5,6). The TATT procedure primarily improves dynamic supination gait by providing muscle balance (7). As a consequence of transferring TAT into lateral cuneiform, the cuneiforms and the cuboid are shifted more laterally than normal and that corrects and stabilizes relapsing clubfoot (2). In 1940, Garceau first described the TATT procedure in the treatment of relapsed clubfoot and reported good and excellent results in forefoot adduction correction (6). In our study, we also observed the metatarsus adductus reducing effect of TATT procedure on relapsing clubfoot.

The metatarsus adductus is evaluated by the angle between the longitudinal axis of the metatarsus and the navicular, cuboid and cuneiform bones (8). Farsetti et al. (2) presented the results of TATT procedure in relapsing clubfoot by evaluating the changes of the angles formed by the longitudinal of the navicular - the first cuneiform, the calcaneus - the fifth metatarsal, and the calcaneus - the cuboid by plain radiographs and computed tomography scans (2). After analyzing the outcomes, they observed that the foot abduction occurs after TATT procedure. They stated that the changes in angles might be due to the abducting/everting force caused by the transfer that was able to shift the cuneiforms, cuboid, and the whole forefoot more laterally. It is difficult to evaluate metatarsus adductus in the pediatric age due to insufficient ossification centers of the navicular, cuboid and cuneiform bones (8). Therefore, it is recommended to use TM1 angle and M4M angle on radiographs to evaluate metatarsus deformity in children (5,8). For this reason, unlike the study of Farsetti et al. (2), we evaluated different radiological measurements assessing the metatarsus adductus deformity in our study. Nevertheless, we observed that metatarsus adductus decreased after the TATT procedure.

In a long-term study that evaluates results of the TATT procedure in the treatment of relapsed clubfoot, Holt et al. (1) observed no differences in TM1 angle with the reference group. Similarly, we observed decrease in TM1 in our study. The changes in TC angle were not remarkable in our study.  In the same study, authors observed a smaller TC angle, but they stated that TC angle noted in patients who had been treated with the TATT procedure resulted in no clinically detectable differences between the groups as demonstrated by similar outcomes measured with questionnaires (1). Therefore, we believe that the absence of significant changes in TC angle will not lead any clinical problems in future.

Kuo et al. (6) reported their outcomes of TATT procedure performed in relapsed clubfoot with an average follow-up time of 10.3 (±3.5) years (6). They evaluated the forefoot adduction with measurements of TC and TM1 angles performed on the AP radiographs. They observed that the TM1 angle was corrected a mean of 24.2 degrees (6). In our study, we observed that the TM1 was corrected a mean of 7.9 degrees with statistical significance, which was relatively lower than the study of Kuo et al. (6). We think that this difference is due to our relatively short follow-up period, which was about 2 years. We believe that gradual correction of metatarsus adductus deformity will be observed and long-term results of our study will show similar correction rates with previous studies (6).

Metatarsus adductus deformity in relapsed clubfoot are also treated by osteotomies of metatarsal, cuneiform and cuboid bones (5,9,10). But these procedures may have serious complications as delayed wound healing, malunion, nonunion and shortening of the metatarsal (11). Knörr et al. (5) described a percutaneous method of correcting of severe metatarsus deformity in children. They observed 5.83 degrees correction in M4M, which was stated to be successful. In our study, we observed 11 degrees of correction, which was higher than referral study. Therefore, we think that results of TATT procedure on M4M changes was sufficient to reduce metatarsus adductus deformity. We think that complications related to the osteotomy procedures can be avoided by choosing TATT procedure in the treatment of metatarsus adductus in relapsed clubfoot.


Study Limitations

Our study has some limitations. Due to retrospective nature of this study, the outcome evaluation was only conducted with radiological measurements. As a limitation of this study, we were not able to provide functional assessment of the TATT. Because of our short-term results, we are unable to report the results of the TATT procedure in skeletal maturity.


Conclusion

We think that the TATT procedure provides similar results with simpler intervention compared to osteotomy procedures. Considering the complications of osteotomies in the treatment of metatarsus adductus deformity for  relapsed clubfoot, we believe that surgeons should reconsider the necessity of osteotomy for metatarsus adductus deformities in patients undergoing TATT surgery.


Ethics Committee Approval: For this study, approval is taken from the Institutional Review Board of Metin Sabancı Baltalimanı Osteopathic Hospital (approval number: 08/02/2017-67).

Informed Consent: Retrospective study.

Peer-review: Externally and internally peer-reviewed.

Author Contributions: Concept – A.İ.B., O.N.Ö.; Design – A.İ.B., E.A.; Supervision - A.İ.B., O.N.Ö.; Data Collection and/or Processing- A.K., E.A.; Literature Search – B.Ö., Y.M.D.; Writing Manuscript A.İ.B., O.N.Ö.; Critical Review – B.Ö., Y.M.D.

Conflict of Interest: No conflict of interest was declared by the authors.

Financial Disclosure: The authors declared that this study received no financial support.

Images

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