Subtalar Joint Neutral
Pronunciation: SUB-tay-lar
The position of the subtalar joint in which the calcaneus is neither inverted nor everted relative to the bisection of the lower leg, used as a reference point in orthotic casting and assessment.
Full Definition
Subtalar joint neutral (STJN) is the theoretically balanced position of the rearfoot used as a foundational reference in biomechanical assessment and orthotic prescription. It is determined by palpating the talar head medially and laterally while passively moving the foot until equal prominence is felt on both sides. Editors working on clinical biomechanics documents should be aware that the phrase is sometimes written as 'subtalar neutral' without 'joint,' and both forms are acceptable, though the full term is preferred in formal reports. STJN should not be confused with 'neutral position' as used in spinal documentation. The concept has been subject to clinical debate, and editors should reflect any qualifying language used by the clinician.
Usage
Usage note: The acronym STJN is acceptable after first use. Do not confuse with 'neutral ankle position,' which refers to the tibiotalar joint angle, not the subtalar complex.
In Context
- "The orthotist documented that the cast was taken with the foot held at subtalar joint neutral to ensure accurate orthotic fabrication." — Biomechanical assessment report
- "Check that 'subtalar joint neutral' is not abbreviated to 'STN' without prior definition in the clinical report." — Editorial checklist