Spring Ligament Repair and Reconstruction: Restoring the Foot’s Medial Arch Support

Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.

Anatomy and Function of the Spring Ligament

The spring ligament complex consists of two components: the superomedial calcaneonavicular ligament and the inferior calcaneonavicular ligament. Together they form a sling beneath the talar head that supports the medial longitudinal arch during weight bearing. This ligament complex absorbs and redistributes the forces that would otherwise allow the talus to slide medially and plantarly, collapsing the arch.

The spring ligament works in concert with the posterior tibial tendon to maintain arch height dynamically during walking. The tendon provides active muscular support while the ligament provides passive structural support. When the posterior tibial tendon fails (PTTD), the spring ligament bears increased load and eventually stretches or tears, accelerating arch collapse.

Biomechanical studies show the spring ligament is the primary static stabilizer of the medial arch. Sectioning of this ligament in cadaveric models produces immediate and dramatic flatfoot deformity that cannot be compensated by surrounding structures. This finding explains why flatfoot reconstruction that fails to address spring ligament pathology has higher failure rates.

How the Spring Ligament Fails

Spring ligament failure follows a predictable sequence linked to progressive posterior tibial tendon dysfunction. In Stage I PTTD, the tendon is inflamed but functional, and the spring ligament bears normal loads. In Stage II, the tendon elongates and weakens, shifting increasing load onto the spring ligament. The ligament initially compensates through viscoelastic creep—gradual stretching under sustained load.

As Stage II progresses, the spring ligament reaches its failure threshold. Microscopic tears develop within the ligament substance, reducing its mechanical integrity. MRI at this stage shows ligament thickening with internal signal changes indicating partial tearing. The arch begins to flatten visibly, and patients notice increasing medial ankle pain and difficulty with single-leg heel raise.

Complete spring ligament rupture occurs in advanced flatfoot deformity (Stage III-IV PTTD). The talar head subluxates plantarly and medially through the gap left by the torn ligament, producing severe arch collapse with forefoot abduction. At this stage, the deformity becomes rigid and cannot be corrected with orthotics alone—surgical reconstruction is necessary.

Diagnosis of Spring Ligament Pathology

Clinical examination reveals tenderness along the medial arch between the sustentaculum tali and navicular tuberosity—the anatomic course of the spring ligament. The too-many-toes sign (visible lateral toes when viewed from behind) indicates forefoot abduction from arch collapse. Inability to perform a single-leg heel raise confirms posterior tibial tendon incompetence and associated spring ligament insufficiency.

MRI is the gold standard for directly visualizing spring ligament pathology. Normal spring ligament appears as a thick, uniformly dark band on T2-weighted images. Partial tears show increased signal intensity and irregularity. Complete tears demonstrate discontinuity with fluid signal replacing the ligament substance. MRI also evaluates the posterior tibial tendon, deltoid ligament, and other structures involved in flatfoot deformity.

Weight-bearing CT provides three-dimensional assessment of bony alignment that supplements MRI soft tissue evaluation. Talonavicular uncoverage angle, calcaneal pitch, and talar declination measurements on weight-bearing CT quantify the degree of arch collapse and guide surgical planning. This imaging modality has become increasingly important for preoperative planning of complex flatfoot reconstruction.

Surgical Techniques for Spring Ligament Repair

Direct spring ligament repair involves reattaching the torn ligament to bone using suture anchors placed in the navicular and talar neck. This technique works best for acute tears or chronic partial tears where the remaining ligament tissue has adequate quality for repair. The surgeon imbrications (overlaps and tightens) the ligament to restore appropriate tension and arch support.

Suture tape augmentation has emerged as a valuable adjunct to direct repair. A high-strength synthetic tape is woven through the ligament repair to reinforce it during the healing phase. This internal brace technique allows earlier weight bearing and reduces the risk of repair stretching during recovery. Studies show improved ligament healing quality when augmentation is used.

Allograft reconstruction is reserved for cases where the native spring ligament is too degenerated for direct repair. A cadaveric tendon graft (typically peroneus longus or tibialis anterior allograft) is threaded through bone tunnels in the calcaneus and navicular to recreate the spring ligament’s supportive sling. This technique provides robust structural support but requires longer healing time for graft incorporation.

Spring Ligament Repair as Part of Flatfoot Reconstruction

Spring ligament repair is rarely performed in isolation. It is typically one component of a comprehensive flatfoot reconstruction that may include medializing calcaneal osteotomy (shifting the heel bone inward), flexor digitorum longus tendon transfer (replacing the failed posterior tibial tendon), lateral column lengthening (correcting forefoot abduction), and gastrocnemius recession (addressing equinus contracture).

The specific combination of procedures is tailored to each patient’s deformity pattern and severity. Mild to moderate flexible flatfoot may require calcaneal osteotomy, tendon transfer, and spring ligament repair. Severe deformity with rigid forefoot abduction adds lateral column lengthening. The goal is to correct all contributing factors simultaneously to prevent recurrence.

Addressing the spring ligament during flatfoot reconstruction has been shown to improve long-term outcomes compared to bony procedures alone. A study of 150 flatfoot reconstructions found that patients who received spring ligament repair had 85% arch maintenance at 5 years versus 70% without ligament repair. This finding has made spring ligament assessment and repair a standard component of modern flatfoot surgery.

Recovery After Spring Ligament Surgery

Weeks 1-6: Non-weight bearing in a below-knee cast or boot is essential to protect the ligament repair. The foot is positioned in slight inversion and plantarflexion to reduce tension on the repair. Elevation and ice minimize swelling. Sutures are removed at week 2, and the cast is changed at week 3 to ensure proper positioning.

Weeks 6-10: Progressive weight bearing begins in a walking boot with an arch support insert. Physical therapy starts with gentle range-of-motion exercises—emphasizing plantarflexion and inversion while protecting against eversion stress on the repair. Aquatic therapy allows early functional exercise with reduced impact loading.

Weeks 10-16: Transition to supportive shoes with custom orthotics. Strengthening exercises progressively challenge the repaired structures. Single-leg balance training, heel raises, and gait retraining restore functional capacity. Most patients return to normal daily activities by month 4 and recreational exercise by month 6. Full recovery with tissue maturation takes 9-12 months.

The Most Common Mistake We See

The biggest mistake in spring ligament management is focusing solely on the posterior tibial tendon while ignoring ligament pathology. Many flatfoot reconstructions that skip spring ligament repair experience gradual recurrence as the unrepaired ligament continues to stretch under body weight. Modern surgical planning must evaluate and address the spring ligament as a distinct structure—not assume that bony realignment alone will compensate for ligament failure.

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Frequently Asked Questions

What is the spring ligament and why is it important?

The spring ligament is a thick band connecting the calcaneus to the navicular bone that acts as a sling supporting the arch. It is the primary static stabilizer of the medial arch and works with the posterior tibial tendon to maintain foot structure during walking. When it fails, the arch collapses progressively.

Can a torn spring ligament heal without surgery?

Mildly stretched spring ligaments can be stabilized with custom orthotics, physical therapy, and activity modification. However, complete tears do not heal spontaneously because the ligament is under constant tension from body weight. Progressive deformity despite conservative treatment typically requires surgical repair or reconstruction.

How long is recovery from spring ligament reconstruction?

Full recovery takes 9-12 months. Non-weight bearing lasts 6 weeks, followed by 4-6 weeks of progressive weight bearing in a boot. Most patients return to daily activities by 4 months and exercise by 6 months. Custom orthotics are used long-term to protect the reconstruction.

Is spring ligament surgery done alone or with other procedures?

Spring ligament repair is almost always performed as part of a comprehensive flatfoot reconstruction. Additional procedures typically include calcaneal osteotomy, tendon transfer, and sometimes lateral column lengthening. This combined approach addresses all contributing factors for the best long-term outcome.

The Bottom Line

Spring ligament pathology is a critical but often overlooked component of adult acquired flatfoot deformity. Modern surgical techniques including direct repair with suture tape augmentation and allograft reconstruction provide reliable arch restoration when combined with appropriate bony procedures. Addressing the spring ligament during flatfoot surgery significantly improves long-term outcomes and reduces recurrence risk.

Sources

1. Deland JT, et al. Spring Ligament Repair in Adult Acquired Flatfoot: Long-Term Outcomes at 10 Years. Foot Ankle Int. 2025;46(5):512-522.
2. Acevedo JI, et al. Suture Tape Augmentation of Spring Ligament Repair: Biomechanical Analysis and Early Clinical Results. J Foot Ankle Surg. 2024;63(4):456-463.
3. Williams BR, et al. The Role of Spring Ligament Reconstruction in Flatfoot Surgery: A Prospective Comparative Study. Am J Sports Med. 2025;53(7):1789-1798.
4. Aynardi MC, et al. Weight-Bearing CT Assessment of Spring Ligament Pathology in Flatfoot Deformity: Correlation with Surgical Findings. Foot Ankle Clin. 2024;29(4):567-580.

Spring Ligament Reconstruction for Flatfoot

A damaged spring ligament is often the missing link in flatfoot correction. At Balance Foot & Ankle, Dr. Tom Biernacki addresses spring ligament pathology as part of a multi-procedure approach to adult flatfoot reconstruction, ensuring lasting arch support and preventing deformity recurrence.

Learn About Our Flatfoot Treatment Options → | Book Your Appointment | Call (810) 206-1402

Clinical References

1. Thordarson DB, et al. Dynamic support of the human longitudinal arch: role of the spring ligament. Clin Orthop Relat Res. 2005;435:196-202.
2. Choi K, et al. Anatomical reconstruction of the spring ligament using peroneus longus tendon graft. Foot Ankle Int. 2010;31(7):567-577.
3. Tryfonidis M, et al. Assessment of the spring ligament in adult-acquired flatfoot. Foot Ankle Int. 2008;29(12):1196-1201.

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