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Anatomical Reconstruction of the Spring Ligament Complex “Internal Brace” Augmentation

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Anatomical Reconstruction of the Spring Ligament Complex “Internal Brace” Augmentation FASXXX10.1177/1938640013499404Foot & Ankle SpecialistFoot & Ankle Specialist 499404research-articleXXXX vol. 6 / no. 6 Foot & Ankle Specialist 441 〈 Evolving Techniques 〉 Anatomical Reconstruction of Jorge Acevedo, MD, and the Spring Ligament Complex Anand Vora, MD “Internal Brace” Augmentation Abstract: The calcaneonavicular the foot.1-5 Its anatomy has been well conjunction with other more commonly (spring) ligament complex is a critical defined, serving as a “hammock” to the applied procedures for extra-articular static support of the medial arch of talar head to maintain the reduced reconstructions. Furthermore, the use of the foot. Compromise of this structure position of the talus in its normal this procedure may decrease dependency has been implicated as a primary anatomical relationships with the on other nonanatomic reconstructive causative factor of talar derotation calcaneus and transverse tarsal procedures. leading to the clinical deformity of articulations.2 peritalar subluxation. Few procedures Many commonly performed extra- Preoperative Planning have been described to address articular reconstructive procedures this deficiency. The technique we attempt to correct adult flatfoot deformity Standard clinical and radiographic describe here is a simple yet effective using methods to realign bony or soft criteria are used to establish the method to reconstruct the spring tissue elements of the ligament complex that can easily foot to achieve talar be used in conjunction with other realignment.5-13 The calcaneonavicular (spring) ligament more commonly used procedures However, few for extra-articular reconstructions methods are able to complex has been well recognized as one of this deformity. We believe this directly address the “of the most critical static supporters of the procedure allows for a more powerful primary causative deformity correction and may decrease factor of talar medial arch of the foot.” dependency on other nonanatomic derotation. reconstructive procedures. We describe a simple yet effective method of diagnosis of adult acquired flatfoot. Keywords: flatfoot; posterior tibial addressing spring ligament pathology Anatomical reconstruction of the spring tendon; spring ligament; deltoid with a primary anatomic repair of the ligament complex with the internal ligament; calcaneonavicular ligament spring ligament and secondary internal brace augmentation is performed in fixation augmentation technique conjuction with other commonly Introduction replicating both the superomedial and performed extra-articular reconstructive The calcaneonavicular (spring) inferomedial bands of the spring procedures (ie, calcaneal osteotomy, ligament complex has been well ligament. This technique may allow cotton osteotomy, lapidus arthrodesis, recognized as one of the most critical correction of the primary talar derotation etc) as indicated for patients amenable static supporters of the medial arch of deformity and can be easily used in to such correction. DOI: 10.1177/1938640013499404. From The Center for Bone and Joint Surgery of the Palm Beaches, Royal Palm Beach, Florida (JA) and Illinois Bone and Joint Institute, Chicago, Illinois (AV). Address correspondence to: Anand Vora MD, Illinois Bone and Joint Institute, Chicago, IL; e-mail: [email protected]. For reprints and permissions queries, please visit SAGE’s Web site at http://www.sagepub.com/journalsPermissions.nav. Copyright © 2013 The Author(s) Downloaded from fas.sagepub.com at GRAMPIAN UNIVERSITY HOSPITALS on June 1, 2015 442 Foot & Ankle Specialist December 2013 Surgical Technique Figure 1. After standard debridement and resection of the diseased portion of the (A) Diagramtic representation (left foot) for placement of proximal swivel lock anchor posterior tibial tendon, the flexor in sustentaculum tali. (B) Medial exposure (left foot) with resected diseased segment digitorum longus is harvested for the of posterior tibial tendon. Swivel lock anchor is being placed in sustentaculum tali planned transfer. The floor of the medial with fibertape (oval). Notice attenuated spring ligament just proximal to posterior flexors and the entire medial static tibial tendon remnant stump (arrow). ligament complex is exposed. On completion of all planned bony extra- articular procedures and prior to transfer of the flexor digitorum longus to the medial pole of the navicular, the native spring ligament is anatomically repaired and the internal augmentation technique is performed. An Arthrex (Naples, FL) fibertape construct with swivel lock anchors is used to recreate the inferomedial and superomedial bands of the spring ligament. On appropriate tensioning of the fibertape construct, this technique restores the hammock-like sling of the medial Figure 2. Figure 3. ligament complex and reduces the talus Passage of superomedial fibertape Passage of inferomedial fibertape to its anatomic resting position relative band from dorsal to plantar direction band and flexor digitorum longus from to the foot while allowing the native (oval) in medial pole of navicular plantar to dorsal direction (oval) in anatomic spring ligament repair to heal (arrow). medial pole of navicular (arrow). under tension. The spring ligament is either anatomically repaired when torn or transected and advanced if patulous/ stretched. If the ligament is ruptured, the tear is completed and a maximally tensioned advancement is performed. When the ligament is stretched, the superior and inferior bands are incised longitudinally and advanced using #2 fiberwire sutures through the midsubstance in a pants-over-vest sustentacular drill hole, which is second limb of the fibertape construct fashion similar to a classic Brostrum directed approximately 15° plantarly. is then used to replicate the lateral ligament repair procedure. This is Care should be taken to avoid inferomedial band of the spring definitively tensioned and repaired after penetration of the subtalar joint the internal fibertape augmentation has superiorly and avoid injury to the ligament by advancing the fibertape been secured to minimize strain on the adjacent soft tissues and neurovascular from plantar to dorsal in the medial anatomic tissue repair. structures inferiorly. This is easily pole of the navicular. This second limb The fibertape internal ligament performed by identifying the flexor is passed simultaneously with the flexor augmentation is then performed with hallucis longus tendon and retracting it digitorum longus tendon (Figure 3) and the proximal limb secured in the inferiorly to protect the adjacent secured under tension using exposed sustentaculum tali with a neurovascular bundle. interference screw fixation (Figure 4). 3.5-mm swivel lock anchor (Figure 1). At this point, a single limb of the The method allows fixation of the This is placed by direct visualization fibertape construct is used to replicate transferred tendon and both fibertape and knowledge of the bony anatomic the superomedial band of the spring limbs through a single tunnel in the prominence of the sustentaculum. ligament by advancing the fibertape navicular (Figure 5). Fluoroscopic guidance is used to from dorsal to plantar in the medial Once the internal augmentation confirm appropriate trajectory of the pole of the navicular (Figure 2). The fibertape construct has been secured, Downloaded from fas.sagepub.com at GRAMPIAN UNIVERSITY HOSPITALS on June 1, 2015 vol. 6 / no. 6 Foot & Ankle Specialist 443 technique, which only restored the Figure 4. inferomedial band. Despite the partial (A) Diagrammatic representation (left foot) of interference screw fixation technique recurrence of deformity the patient is for tensioning of flexor digitorum longus and both inferomedial and superomedial painless in a functional orthosis and bands of fibertape with interference screw fixation in medial pole of navicular. (B) does not desire further surgery. In the Medial exposure (left foot) demonstrating interference screw placement (oval) in remaining cases, radiographic medial pole of navicular (arrow). correction of talonavicular uncoverage and medial column sag as well as clinical alignment has been dramatically improved and maintained in the short-term follow-up. Summary The procedure described allows for primary anatomic repair along with a powerful “internal brace” augmentation of the ligament repair using a rigid fibertape construct with a simple reproducible technique. As with any the anatomic repair of the spring additional adjunctive bony procedures new surgical strategy addressing adult ligament is maximally tensioned. The given the powerful correction afforded acquired flatfoot deformity, it is difficult combination of the fibertape ligament with the internal ligament augmentation to determine what role any single reconstruction augmentation and using the fibertape construct to protect procedure has in achieving correction anatomic spring ligament advancement the medial ligament complex repair. We given most reconstructions involve a under maximal tension restores the have equated this construct to an combination of procedures. In our sling function of the medial “internal brace” that serves to protect experience, we have recognized that a ligamentous complex while allowing the soft tissues during the healing dramatic improvement in talonavicular derotation and reduction of the talus process. It is our belief that this repair is uncoverage and medial column sag is (Figure 6). more anatomic then using a similar achieved using this technique. concept of internal brace
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