Calcaneal Apophysitis (Sever Disease)

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Sever disease, first described in 1912, [1, 2] is a painful inflammation of the calcaneal apophysis (calcaneal apophysitis). [3] It is classified with the child and adolescent nonarticular osteochondroses. [4, 5, 6, 7] (The other disease in this group is Iselin disease, which is inflammation of the base of the fifth metatarsal.)

The etiology of pain in Sever disease is believed to be repetitive trauma to the weaker structure of the apophysis, induced by the pull of the tendo calcaneus (Achilles tendon) on its insertion. This results in a clinical picture of heel pain in a growing active child, which worsens with activity. [8, 9, 10, 11, 12, 13, 14, 15]

Sever disease is a self-limited condition; accordingly, no known complication exists from failure to make the correct diagnosis.

The calcaneal apophysis develops as an independent center of ossification (possibly multiple). It appears in boys aged 9-10 years and fuses by age 17 years; it appears in girls at slightly younger ages. During the rapid growth surrounding puberty, the apophyseal line appears to be weakened further because of increased fragile calcified cartilage.

Microfractures are believed to occur because of shear stress leading to the normal progression of fracture healing. This theory explains the clinical picture and the radiographic appearance of resorption, fragmentation, and increased sclerosis leading to eventual union. The radiographs showing fragmentation of the apophysis are not diagnostic, because multiple centers of ossification may exist in the normal apophysis, as noted. However, the degree of involvement in children displaying the clinical symptoms of Sever disease appears to be more pronounced.

In a study of 56 male students from a soccer academy, of whom 28 had Sever disease and 28 were healthy control subjects, findings suggested that higher heel plantar pressures under dynamic and static conditions were associated with Sever disease, though it was not established whether the elevated pressures predisposed to or resulted from the disease. [16] Gastrocnemius ankle equinus also appeared to be a predisposing factor.

Sever disease, like other similar conditions (eg, Osgood-Schlatter diseaselittle-leaguer’s elbow, and iliac apophysitis), is believed to be caused by decreased resistance to shear stress at the bone–growth plate interface. Studies have indicated that traction apophyses have a higher composition of fibrocartilage than epiphyses subjected more to axial load, which are composed predominantly of hyaline cartilage. [17]

The anatomy of the calcaneal apophysis lends to significant shear stress because of its vertical orientation and the direction of pull from the strong gastrocnemius-soleus muscle group (see the image below).

Sever disease is a relatively common problem in growing active children, though little in the way of exact incidence figures has been available. Wiegerinck et al, in a 2014 cross-sectional study described as the first report on the incidence of calcaneal apophysitis in the general population, examined the records of children aged 6-17 years who visited 34 general practices in the years 2008, 2009, and 2010. [18]  A total of 16,383 files were searched, and 61 children with this condition were diagnosed, for an incidence of 3.7 per 1000.

Sever disease occurs most frequently in active 10- to 12-year-old boys. In a report by Micheli and Ireland that included 85 patients, the average age of presentation was 11 years 10 months for boys and 8 years 8 months for girls. [19]  The incidence of Sever disease is higher in boys than in girls; in the report by Micheli and Ireland, 64% of the 85 patients were male. [19]

Although no well-recognized, long-term sequelae of untreated Sever disease exist, this condition causes pain that can limit performance and participation in sports and, if left untreated, can significantly limit even simple activities of daily life.

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Mark A Noffsinger, MD Clinical Instructor, Department of Orthopedic Surgery, Michigan State College of Human Medicine; Medical Director, Deptartment of Orthopedic Surgery, Bronson Methodist Hospital, Consulting Staff, Kalamazoo Orthopedic Clinic

Mark A Noffsinger, MD is a member of the following medical societies: American Academy of Orthopaedic Surgeons, American Association of Orthopaedic Medicine, American Association for Physician Leadership, American Fracture Association, American Medical Association, AMDA – The Society for Post-Acute and Long-Term Care Medicine, Christian Medical and Dental Associations, Indiana State Medical Association, International Society on Thrombosis and Haemostasis, Michigan State Medical Society, Mid-America Orthopaedic Association, Phi Beta Kappa

Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Received salary from Medscape for employment. for: Medscape.

Vinod K Panchbhavi, MD, FACS Professor of Orthopedic Surgery, Chief, Division of Foot and Ankle Surgery, Director, Foot and Ankle Fellowship Program, Department of Orthopedics, University of Texas Medical Branch School of Medicine

Vinod K Panchbhavi, MD, FACS is a member of the following medical societies: American Academy of Orthopaedic Surgeons, American College of Surgeons, American Orthopaedic Association, American Orthopaedic Foot and Ankle Society, Orthopaedic Trauma Association, Texas Orthopaedic Association

Disclosure: Serve(d) as a speaker or a member of a speakers bureau for: Styker.

James K DeOrio, MD Associate Professor of Orthopedic Surgery, Duke University School of Medicine

James K DeOrio, MD is a member of the following medical societies: American Academy of Orthopaedic Surgeons, American Orthopaedic Foot and Ankle Society

Disclosure: Nothing to disclose.

Calcaneal Apophysitis (Sever Disease)

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