Sever's Disease

History:

• •Posterior or plantar-posterior heel pain - aching, activity-related.
• •Exacerbated by running, jumping, landing, and sport - especially on hard surfaces. Typically worse towards the end of activity or after sport (NOT first-step morning pain, which would suggest plantar fasciitis - rare in children).
• •Relieved by rest.
• •Often bilateral - bilateral heel pain in a child of the right age is strongly suggestive.
• •Gradual onset over days to weeks; no acute trauma.
• •Age 8-14 (peak 10-12) during or just before the growth spurt.
• •Sporting involvement: football, basketball, athletics, netball, gymnastics, dance.
• •The child may walk on tiptoe to offload the heel; in more severe cases this becomes painful itself or progresses to an antalgic limp.
• •No systemic features (no fever, night sweats, or weight loss).
• •Footwear cues: often worse with flat-soled shoes (football boots, school plimsolls) or barefoot; better with cushioned trainers.

Examination:

• •Calcaneal SQUEEZE test (mediolateral compression of the calcaneus at the apophyseal region reproducing the patient''s pain) is the characteristic clinical finding.
• •Tenderness over the calcaneal apophyseal region - usually maximal over the posterior and/or plantar-posterior apophysis rather than the mid-portion Achilles or typical plantar fascia origin.
• •Typically NO swelling, warmth, or erythema; mild local change may occasionally occur in Sever''s itself but marked findings should redirect to red flags.
• •No visible bony prominence (unlike OSD).
• •Normal ankle joint (full ROM or mildly restricted dorsiflexion from calf tightness); no effusion or instability.
• •Tight gastrocnemius-soleus complex - reduced ankle dorsiflexion. The Silfverskiold test differentiates: if dorsiflexion improves with the knee flexed, the gastrocnemius is the tight structure (crosses knee + ankle); if unchanged, the soleus is tight (crosses ankle only).
• •Foot biomechanics: hindfoot pronation, midfoot collapse, arch height.
• •Gait: heel-avoidance (tiptoe) pattern, antalgic if more severe.

Differential diagnoses:

• •Calcaneal stress fracture (older adolescents/young runners - the most important alternative; squeeze test may be positive; MRI distinguishes).
• •Plantar fasciitis (rare in children; FIRST-STEP morning pain; plantar medial tenderness).
• •Achilles tendinopathy (rare in children; tenderness 2-6 cm above insertion).
• •Tarsal coalition (restricted subtalar inversion/eversion, peroneal spasm, rigid flatfoot).
• •Osteomyelitis (fever, raised markers, systemically unwell, refusal to weight-bear).
• •Os trigonum syndrome (posterior ankle pain with forced plantarflexion - ballet, football).
• •Enthesitis-related JIA (morning stiffness >30 min, multiple entheseal sites, joint swelling, possibly raised markers).

Sever's disease is a clinical diagnosis. Imaging is usually not required for typical presentations.

When imaging IS needed: atypical features (night pain, systemic features, unilateral with disproportionate severity, progressive rest pain), failure to improve with appropriate management, diagnostic uncertainty, or suspicion of fracture.

Plain radiographs (when indicated):

• •Lateral foot/ankle X-ray: the calcaneal apophysis may show fragmentation, sclerosis, or irregular ossification. These appearances are also seen in normal development and in symptomatic children, so radiographs do NOT reliably confirm or exclude Sever''s disease - the diagnosis remains clinical.
• •X-rays are primarily useful to exclude other pathology: calcaneal fracture, bone tumour, or osteomyelitis (destructive lesion, periosteal reaction).

MRI (rarely needed): used in atypical, persistent, or unilateral cases to exclude calcaneal stress fracture (the key alternative in older adolescent runners), osteomyelitis, or tumour.

Blood tests: not indicated in typical Sever''s. If systemic features or concern for infection or inflammatory disease are present, FBC, CRP, and ESR are typically normal in Sever''s; raised markers should redirect investigation.

Sever's disease is self-limiting. Management centres on symptom control, load management, supportive footwear, and addressing contributing biomechanical factors while maintaining activity where possible.

Education and reassurance:

• •Explain that Sever's is a growth-related condition that resolves when the calcaneal apophysis fuses (typically 14-16 years); no long-term damage or residual deformity is expected.
• •Symptoms may fluctuate over months to 1-2 years, often worsening during growth spurts and high-training periods.
• •Activity within symptom tolerance is generally safe.

Footwear and heel support:

• •Firm heel raises (e.g. 6-9 mm EVA foam): placed inside shoes to elevate the heel, reducing Achilles traction and offloading the apophysis. Firm material is preferred over soft gel cups, which compress under load and fail to provide sustained mechanical elevation.
• •Cushioned insoles reduce heel-strike impact.
• •Appropriate footwear: well-cushioned and supportive with adequate heel height. Avoid flat-soled shoes (football boots, plimsolls) and barefoot activity on hard surfaces during symptomatic periods. A heel raise can be added inside football boots.
• •Orthotics for significant hindfoot pronation - podiatry referral when biomechanical abnormality is significant.

Load management:

• •Reduce load on the calcaneal apophysis to allow symptoms to settle, while maintaining activity where possible.
• •Activity modification: reduce the volume and intensity of running and jumping during flares; cross-train (swimming, cycling, upper-body work); modify training surfaces where possible.
• •Complete cessation is NOT routinely required, but a child with marked pain, limp, or pain during normal walking may need a more substantial temporary reduction or short period away from impact sport.
• •Graduated return as symptoms allow, guided by symptoms rather than time alone.

Analgesia and adjuncts:

• •Ice after activity for 15-20 minutes.
• •Paracetamol or ibuprofen in line with usual paediatric dosing for flares - short courses, not long-term.
• •Topical NSAIDs (ibuprofen gel) can be considered as a localised alternative.
• •Corticosteroid injection is NOT part of routine management.

Surgery is NOT indicated. Sever's is self-limiting. If symptoms persist beyond the expected age of apophyseal fusion, reconsider the diagnosis (calcaneal stress fracture and other alternatives become more likely).

Rehabilitation addresses the modifiable biomechanical contributors - particularly calf tightness - and progresses calf and foot loading.

Calf stretching (a key rehabilitation component):

• •Gastrocnemius stretch: wall stretch with knee STRAIGHT and heel on the ground (gastrocnemius crosses knee + ankle).
• •Soleus stretch: wall stretch with knee BENT (soleus crosses ankle only). Both must be stretched.
• •The Silfverskiold test guides which is tighter.
• •Stretches are sustained (around 30 seconds), regular (at least twice daily and before and after sport), and consistent over weeks to months.

Progressive strengthening:

• •Calf strengthening: start with isometric calf raises (hold at the top - loads the muscle-tendon unit without repetitive impact). Progress to eccentric (slow lowering) and then full concentric-eccentric loading as tolerated. The principles mirror tendinopathy rehabilitation.
• •Intrinsic foot strengthening (toe curls, short-foot exercises).
• •Hip and core strengthening as adjuncts - poor proximal control may increase distal loading.

Graduated return to sport - a traffic-light approach:

• •Green (pain 3/10 or less, no limp): full participation.
• •Amber (pain 4-6/10 or mild gait alteration): modify volume and intensity.
• •Red (pain over 6/10 or limping/unable to run normally): reduce load significantly, rehabilitation focus, cross-train.
• •The child does not need to be completely pain-free to participate; mild discomfort that does not worsen and settles quickly is acceptable. Communicate with the school - PE may need temporary modification rather than exclusion during flares. Heel raises can be added in school shoes.

• •NICE CKS (common musculoskeletal presentations in children) - the UK primary care framework covering heel pain in children, including Sever's disease.
• •UK paediatric SEM and orthopaedic consensus - clinical diagnosis with imaging reserved for atypical or persistent presentations; conservative management focused on education, load management, footwear, and rehabilitation.
• •Tendinopathy-style progressive calf-loading principles (isometric, eccentric, full concentric-eccentric) - the broader evidence base supporting paediatric apophyseal loading rehabilitation.
• •The apophysitis family: Sever's (calcaneus, 8-14), Osgood-Schlatter (tibial tuberosity, 10-15), Sinding-Larsen-Johansson (inferior patella, 10-14) - all self-limiting clinical diagnoses with shared rehabilitation principles.

• •Sever's = calcaneal apophysitis; most common cause of heel pain in children aged 8-14; often bilateral.
• •Mechanism: Achilles traction + heel-strike compression on the maturing apophysis; OSD is traction only.
• •Calcaneal squeeze test (medial-lateral compression) reproduces pain - the characteristic clinical finding.
• •Clinical diagnosis - imaging usually not needed; X-ray fragmentation does not reliably confirm or exclude.
• •Management: firm heel raises, calf stretching (gastrocnemius and soleus), load management, progressive loading.
• •Self-limiting; resolves with apophyseal fusion at 14-16 years; no residual prominence (unlike OSD).