Spring Ligament Repair: Reconstructing the Calcaneonavicular Ligament in Flatfoot Surgery

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

Medical Review

Quick Answer: Spring Ligament Repair

The spring ligament (plantar calcaneonavicular ligament) is the primary static stabilizer of the medial longitudinal arch. When this ligament fails—either from acute injury or progressive attenuation secondary to posterior tibial tendon dysfunction (PTTD)—the talus migrates plantarward and medially through the unsupported talonavicular joint, causing progressive flatfoot deformity. Spring ligament repair or reconstruction has become an essential component of surgical flatfoot correction, addressing the ligamentous insufficiency that bony procedures alone cannot restore. At Balance Foot & Ankle, we incorporate spring ligament assessment into every flatfoot evaluation and include ligament repair or augmentation when surgical reconstruction is indicated—recognizing that failure to address the spring ligament is a leading cause of recurrent deformity after flatfoot surgery.

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Table of Contents

• What Is the Spring Ligament?
• Anatomy & Biomechanical Function
• How the Spring Ligament Fails
• Diagnosis of Spring Ligament Insufficiency
• Most Common Mistake
• Surgical Repair Techniques
• Combined Flatfoot Reconstruction
• Recovery Timeline
• Post-Operative Biomechanical Support
• Pain Management After Surgery
• Compression & Healing
• Complete Recovery Kit
• Warning Signs After Surgery
• Video: Spring Ligament Repair
• Frequently Asked Questions
• Sources
• Schedule a Consultation

What Is the Spring Ligament?

The spring ligament—formally the plantar calcaneonavicular ligament—is a broad, thick ligamentous structure that spans from the sustentaculum tali of the calcaneus to the plantar and medial surfaces of the navicular bone. It forms the floor of the talonavicular joint and acts as a hammock supporting the head of the talus. Without this ligamentous support, the talus has no bony restraint preventing it from migrating plantarward and medially, and the medial longitudinal arch collapses under body weight.

The spring ligament complex actually consists of two distinct components: the superomedial calcaneonavicular ligament (the larger, more biomechanically important portion) and the inferior calcaneonavicular ligament (the smaller plantar band). The superomedial component contains fibrocartilage on its superior surface that articulates directly with the head of the talus—making it a unique structure that functions as both a ligament and an articular surface. This dual role explains why spring ligament failure has such profound consequences for foot architecture: when it attenuates, both the structural support and the articular congruity of the talonavicular joint are compromised simultaneously.

Spring Ligament Anatomy & Biomechanical Function

The spring ligament’s biomechanical importance cannot be overstated. Cadaveric studies demonstrate that sequential sectioning of the spring ligament produces more talonavicular joint instability than sectioning any other single ligament in the foot. When the spring ligament is intact, it resists approximately 70% of the force that would otherwise collapse the medial longitudinal arch during stance phase. The posterior tibial tendon (PTT) provides the primary dynamic support for the arch, but it relies on the spring ligament as a static checkrein—when the PTT fatigues or fails, the spring ligament absorbs the load and maintains arch height until it too becomes attenuated.

This synergistic relationship between the PTT and spring ligament explains the classic progression of adult acquired flatfoot deformity (AAFD). Stage I begins with PTT tenosynovitis while the spring ligament remains intact and the arch is preserved. Stage II develops when the PTT becomes insufficient and the spring ligament begins to stretch under increased load—the arch starts to collapse and the forefoot abducts. By Stage III, both the PTT and spring ligament have failed, producing a rigid flatfoot with fixed talonavicular subluxation. Understanding this progression is critical because surgical intervention at Stage II—when the spring ligament can still be repaired—produces better outcomes than waiting until Stage III when reconstruction requires more extensive bony procedures.

How the Spring Ligament Fails

Spring ligament failure occurs through two primary mechanisms. The more common is chronic attenuation secondary to posterior tibial tendon dysfunction. As the PTT loses its dynamic arch-supporting function, the spring ligament absorbs progressively increasing loads with each step. Over months to years, the collagen fibers of the ligament undergo creep deformation—they elongate under sustained load, losing their ability to maintain talonavicular joint congruity. MRI studies show that spring ligament attenuation correlates directly with the severity of flatfoot deformity and is present in virtually all Stage II and III AAFD cases.

Acute spring ligament tears are less common but do occur, typically in high-energy injuries involving forced eversion and dorsiflexion of the foot. These acute injuries may present as an isolated ligament tear or as part of a more complex injury pattern involving the deltoid ligament, PTT, or Lisfranc complex. Acute tears produce immediate medial arch pain, swelling medial to the talonavicular joint, and an inability to perform a single-leg heel raise. Early recognition and treatment of acute spring ligament tears produces better outcomes than delayed reconstruction after the deformity has become established.

Diagnosis of Spring Ligament Insufficiency

Clinical diagnosis begins with the observation of flatfoot deformity on standing—loss of medial arch height, hindfoot valgus, and forefoot abduction (the “too many toes” sign when viewed from behind). The single-leg heel raise test is the key functional assessment: the patient stands on the affected foot and rises onto the ball of the foot. Normal function produces hindfoot inversion during the rise; spring ligament insufficiency with PTT dysfunction results in inability to invert the hindfoot or inability to complete the heel raise at all.

Palpation along the medial aspect of the talonavicular joint may reveal tenderness at the spring ligament attachment sites. The first metatarsal rise test assesses medial column instability—with the patient standing, the examiner attempts to passively dorsiflex the first ray. Excessive dorsiflexion indicates medial column instability that may require concurrent medial column stabilization during reconstruction. Weight-bearing radiographs demonstrate the bony consequences of spring ligament failure: talar head uncoverage on AP view, talar declination angle increase on lateral view, and calcaneal pitch decrease.

MRI is the gold standard for directly visualizing the spring ligament. The superomedial component is best seen on axial and coronal sequences, where normal ligament appears as a homogeneous low-signal band. Attenuation appears as thickening with heterogeneous signal, while complete tears show discontinuity with surrounding edema. MRI also evaluates the PTT status, deltoid ligament integrity, and talonavicular articular cartilage—all of which influence surgical planning.

Most Common Mistake with Spring Ligament Problems

🔑 Key Takeaway: The most common mistake in flatfoot surgery is performing bony procedures (calcaneal osteotomy, Cotton osteotomy) without addressing the spring ligament. Bony realignment restores skeletal architecture, but if the attenuated spring ligament is not repaired or augmented, the talonavicular joint remains unstable and the deformity gradually recurs as the ligament continues to stretch under load. Modern flatfoot reconstruction protocols include spring ligament repair or augmentation as a routine component alongside bony correction. The second common mistake is waiting too long for surgery—allowing progression from flexible Stage II (where joint-sparing procedures with ligament repair produce excellent outcomes) to rigid Stage III (where triple arthrodesis may be the only option).

Surgical Repair Techniques

Spring ligament repair techniques range from direct primary repair to augmented reconstruction, selected based on the quality of residual ligament tissue and the severity of deformity. Primary repair is appropriate when the ligament is attenuated but has sufficient tissue quality for suture plication. The superomedial component is exposed through a medial approach, and the attenuated ligament is imbricated (folded and sutured) to restore tension and talonavicular joint congruity. Suture anchors placed in the navicular tuberosity and sustentaculum tali provide secure fixation points.

Augmented repair is used when the ligament tissue is too degenerated for reliable primary repair. The most common augmentation technique uses the peroneus longus tendon as a graft, routed through bone tunnels in the navicular and calcaneus to recreate the spring ligament’s biomechanical function. Alternative graft sources include allograft (cadaveric tendon), the flexor digitorum longus tendon (which is often transferred to the navicular as part of the PTT reconstruction), and synthetic ligament augmentation devices. Some surgeons use internal brace augmentation with high-strength suture tape to protect the repair during early healing.

The advent of arthroscopic and minimally invasive techniques has expanded the options for spring ligament repair. Arthroscopic evaluation of the talonavicular joint allows direct visualization of the articular surface of the spring ligament and assessment of cartilage integrity. Percutaneous suture anchor techniques reduce surgical dissection and may accelerate rehabilitation. However, for significant deformity correction requiring concurrent bony procedures, open repair through the medial utility incision remains the standard approach.

Combined Flatfoot Reconstruction

Spring ligament repair is rarely performed in isolation—it is typically one component of a comprehensive flatfoot reconstruction that addresses all deforming forces simultaneously. The standard Stage II AAFD reconstruction combines medializing calcaneal osteotomy (MCO) to correct hindfoot valgus, flexor digitorum longus (FDL) transfer to augment the failed PTT, spring ligament repair to restore talonavicular stability, and gastrocnemius recession to address the equinus contracture that drives forefoot overload. For patients with medial column instability, a Cotton (dorsal opening-wedge cuneiform) osteotomy is added to stabilize the first ray.

The order of surgical steps follows a logical sequence: gastrocnemius recession first (to address equinus), calcaneal osteotomy next (to correct hindfoot alignment), then spring ligament repair (easier to assess after bony correction), and finally FDL transfer (to provide dynamic arch support over the repaired spring ligament). This systematic approach ensures that each component is addressed in the context of the corrected alignment, optimizing the biomechanical result.

Recovery Timeline After Spring Ligament Repair

Recovery from spring ligament repair within a comprehensive flatfoot reconstruction is a slow, protected process—the repaired ligament requires extended immobilization to heal under appropriate tension. Weeks 0–2: Non-weight-bearing in a posterior splint with strict elevation. Weeks 2–6: Non-weight-bearing in a short leg cast, continuing elevation and icing. Weeks 6–10: Transition to a CAM walking boot with progressive weight-bearing as tolerated. Physical therapy begins with gentle ankle range-of-motion exercises. Weeks 10–16: Full weight-bearing in the boot with progressive strengthening. Begin arch-support exercises and intrinsic foot muscle activation. Months 4–6: Transition from boot to supportive athletic shoes with PowerStep insoles. Gait retraining and progressive return to full activity.

Post-Operative Biomechanical Support

The transition from surgical boot to regular footwear is the highest-risk period for spring ligament repair because the reconstructed ligament is still maturing and remodeling. The repaired spring ligament achieves approximately 60–70% of ultimate strength by 3 months and full maturation by 6–12 months. During this period, external biomechanical support is essential to protect the repair while allowing progressive functional loading.

PowerStep Pinnacle Insoles are our standard post-reconstruction orthotic. The semi-rigid arch support directly offloads the spring ligament by supporting the medial longitudinal arch from below—reducing the force that the healing ligament must resist during weight-bearing. The heel cradle stabilizes the calcaneus in the corrected position achieved by the calcaneal osteotomy. The dual-layer cushioning absorbs ground reaction forces during the transition to regular activity. We prescribe PowerStep in all footwear for a minimum of 12 months post-surgery, and most patients choose to continue indefinitely.

For patients with more significant residual medial column laxity or those transitioning from a long period of immobilization, the PowerStep Pinnacle Maxx provides enhanced medial posting and a deeper heel cup for maximum rearfoot control. Custom orthotics with a medial flange can be fabricated once the foot has reached its final corrected position (typically 4–6 months post-operatively) for patients who need patient-specific support geometry.

Pain Management After Spring Ligament Surgery

Post-surgical pain management follows the multimodal approach standard for reconstructive foot surgery. The regional popliteal nerve block provides 18–36 hours of excellent analgesia covering the surgical sites. Transition to scheduled acetaminophen and short-course oral anti-inflammatories (once the surgeon clears NSAID use, typically after the initial 48-hour wound-healing window) reduces opioid requirements.

Doctor Hoy’s Natural Pain Relief Gel becomes a valuable tool once the incision has fully healed (3–4 weeks). Applied to the medial ankle, arch region, and posterior heel (calcaneal osteotomy site), Doctor Hoy’s provides localized analgesic effect that supports productive physical therapy participation. The topical approach is particularly beneficial during the boot-to-shoe transition when patients experience new weight-bearing discomfort as the reconstructed foot adapts to its corrected alignment.

The Doctor Hoy’s Arnica Boost Recovery Cream supports overnight tissue recovery during the rehabilitation period. Applied to the medial arch, ankle, and heel at bedtime, the arnica compounds support tissue repair in the surgical area while the emollient base maintains skin hydration that may be compromised by prolonged cast and boot wear. The morning-gel/evening-cream protocol provides 24-hour topical management during the most demanding phases of rehabilitation.

Compression & Healing Optimization

Post-surgical edema is particularly problematic after flatfoot reconstruction because the extensive soft tissue dissection required for spring ligament repair, calcaneal osteotomy, and tendon transfer produces significant inflammatory response. Persistent edema delays wound healing, impairs ligament maturation, and limits rehabilitation progress by creating mechanical stiffness in the ankle and subtalar joint.

DASS Performance Compression Socks are introduced once surgical wounds have healed and the patient transitions from bandaging to regular hosiery (typically 3–4 weeks post-operatively). The graduated compression profile promotes venous and lymphatic return from the operative extremity, counteracting the gravity-dependent swelling that accumulates during the hours of weight-bearing that progressively increase during rehabilitation. We recommend wearing DASS compression socks during all upright hours for the first 3 months after transitioning from the surgical boot.

The proprioceptive benefit of compression is especially important after flatfoot reconstruction. The surgically corrected foot has a fundamentally different alignment than the pre-operative deformity—the arch is elevated, the hindfoot is neutralized, and the forefoot is de-rotated. The patient’s neuromuscular system must recalibrate to this new position, and the circumferential compression from DASS socks enhances joint position awareness during this neural adaptation period.

Complete Spring Ligament Recovery Kit

✅ Our Complete Recovery Kit for Spring Ligament Repair:

1. PowerStep Pinnacle Insoles — Medial arch support to protect the healing spring ligament during boot-to-shoe transition
2. Doctor Hoy’s Natural Pain Relief Gel — Topical analgesia for the medial arch, ankle, and calcaneal osteotomy sites
3. DASS Performance Compression Socks — Post-surgical edema control and proprioceptive support during neural adaptation

This kit supports the complete recovery arc from surgery through full return to activity. PowerStep protects the spring ligament repair by supporting the arch externally, Doctor Hoy’s manages pain during rehabilitation, and DASS controls the edema that impairs healing. Begin using this kit as directed by your surgeon during the boot-to-shoe transition phase.

Warning Signs After Spring Ligament Surgery

🚨 Contact your surgeon immediately if you experience:

• Increasing pain, redness, or warmth at the medial incision after initial improvement
• Drainage from any incision that is cloudy or foul-smelling
• Fever above 101°F (38.3°C)
• Calf pain or swelling (possible deep vein thrombosis)
• Sudden return of arch flattening or foot “giving way” medially
• New numbness or tingling along the medial ankle (possible nerve irritation)
• Inability to progress weight-bearing as expected at follow-up
• Hardware prominence or pain directly over the calcaneal osteotomy screw

Early detection of complications optimizes outcomes. Do not wait for your next scheduled visit if any of these occur.

Video: Spring Ligament Repair Explained

Watch Dr. Biernacki discuss the spring ligament’s role in flatfoot deformity, surgical repair techniques, and the comprehensive reconstruction approach used at Balance Foot & Ankle.

Dr. Tom Biernacki, DPM

Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.