Foot and leg pain among otherwise healthy children is a common reason for referral to our pediatric orthopaedics outpatient clinic. The pain is often intermittent and transient, but for some the pain is more dominating and has an impact on the child and families. Children grown and have normal anatomical variations such as in-toeing, out-toeing, hypermobility, flatfeet, knock knees etc. Assessing such normal variants is a major part of pediatric orthopaedic practice, and a common finding is a positive Silvferskiöld test, indicating gastrocnemius tightness. This is when dorsiflexion of the ankle is limited with extended knee, compared to flexed knee. We do not know if this is a more frequent finding among children with foot and leg pain. There is however evidence that adults with painful foot conditions often have gastrocnemius tightness. This project will investigate for gastrocnemius tightness in otherwise healthy children referred to our pediatric orthopaedic outpatient clinic with foot and leg pain, and compare results with a similar control group of children without pain. The aim is to investigate if there is an association, and how pain and tightness develops over time. The knowledge from this project will enable us to develop new treatment strategies to this patient group, where current evidence based recommendations are few.