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

The Spring Ligament: The Keystone of the Arch

The spring ligament complex—formally known as the plantar calcaneonavicular ligament—is the primary static stabilizer of the medial longitudinal arch. It spans the gap between the sustentaculum tali of the calcaneus and the plantar surface of the navicular bone, forming a sling that supports the talar head from below and prevents the arch from collapsing under body weight. When the spring ligament fails—either acutely from trauma or chronically from progressive degeneration in the setting of adult-acquired flatfoot deformity (AAFD)—the arch collapses, the heel drifts into valgus, and the forefoot abducts (swings outward).

Why the Spring Ligament Fails in Flatfoot

Adult-acquired flatfoot deformity is a progressive condition most often driven by posterior tibial tendon dysfunction (PTTD). As the posterior tibial tendon (the primary dynamic arch-lifting structure) weakens and degenerates, the spring ligament is forced to bear increasing static load. Over months to years, the ligament attenuates, elongates, and ultimately becomes incompetent—allowing the talar head to plantar-medially migrate into the spring ligament “hammock.” MRI studies demonstrate spring ligament tears in the majority of patients with stage II–III PTTD undergoing surgical reconstruction, even when the ligament appears structurally intact on physical examination.

Diagnosing Spring Ligament Insufficiency

Weight-bearing foot X-rays reveal arch collapse through Meary’s angle (talar-first metatarsal angle) and calcaneal pitch. The degree of forefoot abduction is assessed by the talonavicular coverage angle on AP views. MRI provides the most detailed assessment of spring ligament integrity—demonstrating partial or complete tears, ligament attenuation, and surrounding synovitis. Ultrasound can also visualize the spring ligament and guide diagnostic injection when the diagnosis is uncertain.

Spring Ligament Reconstruction: Surgical Technique

Spring ligament reconstruction is performed as part of comprehensive flatfoot correction surgery rather than as an isolated procedure. The full reconstruction typically includes FDL tendon transfer (to replace the failed posterior tibial tendon’s dynamic function), calcaneal osteotomy (to realign the heel), and spring ligament repair or reconstruction (to restore static arch support).

When native ligament tissue quality permits, the attenuated spring ligament is imbricated (folded and tightened) using non-absorbable sutures and secured to the navicular and sustentaculum tali with suture anchors under appropriate tension. When tissue is severely degenerated or absent, reconstruction uses allograft or autograft tendon tissue passed through bone tunnels to recreate the ligament’s anatomic course. Suture tape augmentation devices are increasingly used to protect biologic repair while healing proceeds—providing immediate structural support and reducing the risk of early repair failure.

Recovery After Flatfoot Reconstruction Including Spring Ligament Repair

Comprehensive flatfoot reconstruction is a major procedure with a corresponding recovery timeline. Patients are non-weight-bearing for 6–8 weeks in a short leg cast to protect osseous healing (osteotomy) and soft tissue repair. Progressive weight-bearing in a boot follows at weeks 8–12, with transition to supportive footwear and custom orthotics at 12–14 weeks. Physical therapy—focused on calf and posterior tibial strengthening, proprioception training, and gait normalization—begins as weight-bearing is established. Most patients achieve functional recovery and return to recreational activities at 6–9 months, with continued improvement for up to 12–18 months postoperatively.

Outcomes

Including spring ligament repair in flatfoot reconstruction significantly improves maintenance of arch correction compared to tendon transfer and osteotomy alone. Long-term follow-up studies demonstrate maintained radiographic correction and high patient satisfaction rates when all components of the deformity are comprehensively addressed. This reinforces the principle that successful flatfoot surgery requires identifying and correcting every element of the deformity—including the often-overlooked spring ligament insufficiency.

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Clinical References

1. Thomas MJ, et al. “The population prevalence of foot and ankle pain.” Pain. 2011;152(12):2870-2880.
2. Hill CL, et al. “Prevalence and correlates of foot pain in a population-based study.” J Foot Ankle Res. 2008;1(1):2.
3. Riskowski JL, et al. “Measures of foot function, foot health, and foot pain.” Arthritis Care Res. 2011;63(S11):S229-S236.

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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.