The plantar fascia, also known as the plantar aponeurosis, is a thick, fibrous band of connective tissue that originates from the medial tubercle of the calcaneus (heel bone) and extends distally to the proximal phalanges of the toes (1). It is composed of three distinct segments: the medial, central, and lateral bands. The central band is the thickest and most significant portion, providing the majority of the structural support. It spans the length of the foot and divides into five slips that insert into the base of the proximal phalanges. Each slip is connected to the flexor tendons, sheaths, and the superficial transverse metatarsal ligament. The medial band is the thinnest and least distinct of the three. It extends from the medial aspect of the calcaneus and integrates with the fascia covering the abductor hallucis muscle. The lateral band extends from the lateral aspect of the calcaneus and integrates with the fascia overlying the abductor digiti minimi muscle. The medial and lateral bands, though thinner, also contribute to the overall function and integrity of the plantar fascia (2). The primary function of the plantar fascia is to provide structural support to the arch of the foot, contributing to both static and dynamic stability, and preventing flattening under the weight-bearing conditions. It plays a crucial role in the biomechanics of the foot, particularly during the gait cycle (3, 4). It acts as a shock absorber, distributing the impact forces during activities such as walking, running, and jumping (5). During the toe-off phase of the gait cycle, the plantar fascia tightens as the toes dorsiflex (6). This tension elevates the arch and provides a rigid lever for propulsion, known as the windlass mechanism (3). This mechanism enhances the efficiency of the foot during push-off.

Pathological conditions of the plantar fascia often arise from repetitive stress, overuse, or acute trauma. Plantar fasciitis is a common condition characterized by inflammation of the plantar fascia, typically at its origin on the calcaneus. It is often a result of overuse, improper footwear, or biomechanical abnormalities (7). Patients with plantar fasciitis typically present with heel pain, especially with the first steps in the morning or after prolonged periods of inactivity. The pain is often localized to the medial aspect of the heel and may decrease with activity. The underlying pathology involves microtears and degeneration of the collagen fibers within the plantar fascia, leading to inflammation and thickening of the fascia. Chronic cases may exhibit neovascularization and fibrosis (8). Plantar fascia rupture is a less common but more severe condition, which can generally occur as a complication of chronic plantar fasciitis. Sudden increases in physical activity, direct trauma, corticosteroid injections, and chronic degeneration from plantar fasciitis can predispose individuals to rupture (9). Patients with a plantar fascia rupture often report a sudden, sharp pain in the arch or heel of the foot, sometimes accompanied by a popping sound. Swelling, bruising, and an inability to bear weight are common findings. A rupture involves a complete or partial tear of the plantar fascia fibers, leading to a loss of structural integrity and functional support. The tear may occur at the origin, mid-portion, or insertion of the fascia (10). Spontaneous rupture of the plantar fascia is a rare and uncommon yet impactful injury characterized by the sudden tearing of the fibrous tissue along the bottom of the foot. It can occur without any predisposing factors, in healthy patients engaging in moderate low-impact activities. The management of plantar fascia ruptures can be challenging, since there is no unequivocal strategy, with treatment options ranging from conservative approaches to surgical intervention. Despite the potential benefits of surgery, conservative management is often preferred due to its non-invasive nature and favorable outcomes (11).

This case report details an integrated rehabilitative approach to a spontaneous plantar fascia rupture in a healthy 35-year-old male. By documenting the clinical presentation, diagnostic process, treatment plan, and outcomes, this report aims to provide insight into the effectiveness of non-surgical management strategies and contribute to the existing literature on this rare condition.

At the 12-week follow-up, the patient reported a significant reduction in pain (VAS score: 2) and marked improvement in functional mobility (FFI score: 14%). The patient had undergone physiotherapeutic sessions regularly (as confirmed by the therapist); NSAIDs have been taken only for 7 days after the diagnosis. Physical examination showed no tenderness, and the patient was able to bear full weight on the foot without discomfort. No adverse events have been reported during this time interval. A follow-up ultrasound demonstrated complete resolution of the plantar fascia rupture and no residual inflammation. He hadn't any limitations in practicing his routine sport activity. The patient was advised to continue strengthening exercises and use supportive footwear during high-impact activities to prevent future injuries.

This case highlights the effectiveness of a conservative management approach in treating a healthy 35-year-old male patient who experienced a spontaneous plantar fascia rupture. We aimed to increase awareness of an uncommon yet impactful clinical condition, focusing on its diagnosis and management. This case underscores the importance of considering spontaneous rupture in the differential diagnosis of acute heel pain, even in the absence of typical risk factors, and supports the efficacy of non-surgical treatment modalities in managing such injuries. No guidelines or other unequivocal recommendations are available for the treatment of this condition (11); after performing a thorough examination of the evidence available in the Literature concerning plantar fascia rupture and plantar fasciopathies, we elaborated and proposed a novel integrated rehabilitative approach. This integrated rehabilitation approach was able to get a satisfying functional recovery in this case, as demonstrated by a significant reduction in VAS and FFI scores. The patient's recovery without surgical intervention underscores the potential benefits of non-invasive treatment strategies.

Conservative management of plantar fascia ruptures focuses on alleviating pain, reducing inflammation, promoting tissue healing, and gradually restoring function. This approach generally includes rest, immobilization, cryotherapy, physical therapy, and gradual reintroduction of weight-bearing activities. In the rehabilitation protocol, an adequate stretching program of the triceps surae structures has a prominent role, considering the relationship of the plantar fascia with the paratenon of the Achilles tendon (12), as confirmed in a cadaveric study performed by Stecco et al. in 2013 (13). Spontaneous rupture of the plantar fascia, defined as a rupture occurring in healthy patients with no prior foot risk factors, is rare with a few case reports reported in the literature (14–20). The rupture of the plantar fascia typically occurs due to chronic overuse, leading to microtears and degeneration, and predominantly affects athletes and individuals engaged in high-impact or repetitive activities. Factors contributing to its rupture include chronic plantar fasciitis, corticosteroid injections, obesity, and sudden increases in physical activity. Lee et al. examined the clinical characteristics and risk factors for plantar fascia rupture by comparing age, gender, affected side, BMI, visual analogue scale, previous treatments, degree of ankle dorsiflexion, the extent of activity, calcaneal pitch angle, heel alignment and the presence of a calcaneal spur. In their series, of these risk factors, only corticosteroid injections had a prominent role in the occurrence of a plantar fascia rupture (9). To prevent the risk of plantar fascia rupture, a therapeutic alternative to corticosteroid injections for the management of plantar fasciitis might be ultrasound-guided collagen injections, as reported by Corrado et al. in 2020 (21) but further studies are necessary. As emerged in the systematic review performed by Debus et al. in 2020 (including 78 studies with 124 patients) there are few available studies concerning the rupture of plantar fascia with poor data quality. Anyway, the current literature supports conservative management as an effective treatment for plantar fascia ruptures. As confirmed by the authors there is no standardized therapeutic approach. The maximum duration of immobilization of 3 weeks in a rigid walker with pain-adapted weight-bearing seems to be the most applied therapeutic protocol (11). A review by Mosca et al. highlighted that ruptures of the plantar fascia are more common in patients treated with local injections of steroids but are very rare in asymptomatic patients. According to the authors, surgical intervention might be necessary in severe, refractory, or chronic cases, while most patients respond well to conservative measures (although not standardized in the literature). The review underscored the importance of early diagnosis and appropriate management to ensure optimal recovery (10).

Our study has some limitations that should be addressed. First, this report discusses only one instance of spontaneous rupture of the plantar fascia, limiting the ability to generalize findings or draw broad conclusions. A larger series of cases or a comparative study would provide more robust data. Second, the follow-up period in this case was relatively short; extended follow-up would provide a more comprehensive understanding of the prognosis and effectiveness of the treatment. Third, the patient in this case was a healthy adult male with a specific lifestyle (recreational cyclist). The findings may not be generalizable to different populations, such as older adults, females, or individuals with comorbidities. Fourth, the assessment of pain and functional improvement relies heavily on patient-reported outcomes, which can be subjective. Objective measures such as functional tests could provide more reliable data. Finally, the case report does not delve deeply into potential etiological factors that could contribute to spontaneous rupture in the absence of identifiable risk factors. A discussion on possible underlying mechanisms, such as genetic predisposition or microscopic degenerative changes, would be valuable. By acknowledging these limitations, the report highlights areas for future research and emphasizes the need for more extensive studies to better understand and manage spontaneous plantar fascia ruptures.

This case report aims to increase awareness of spontaneous plantar fascia rupture, a rare and uncommon yet impactful injury, to keep in mind in the differential diagnosis. This case demonstrates that an integrated rehabilitative program can be highly effective in treating this pathological condition and lead to full functional recovery without the need for surgical intervention. The structured approach, including rest, immobilization, physiotherapy, and gradual return to activity, proved successful in this patient, offering a practical framework for clinicians managing similar cases. Continued research and documentation of such cases are essential to further validate and refine conservative treatment protocols for plantar fascia ruptures.