Prediction scores
Validated shoulder and elbow prediction and risk scores, reproduced to support calculation in clinic. Each links to an interactive calculator. Use alongside, not instead of, the original published papers and your clinical judgement.
Instability Severity Index Score (ISIS)
Estimates recurrence risk after arthroscopic Bankart repair for recurrent anterior instability.
Balg F, Boileau P. J Bone Joint Surg Br. 2007;89-B:1470-1477.
Open calculator →Non-operative Instability Severity Index Score (NISIS)
Estimates the risk of failure (recurrence or progression to surgery) when anterior instability is managed non-operatively.
Tokish JM, et al. Sports Health. 2020;12(6):598-602.
Open calculator →Glenoid track (on-track / off-track)
Assesses whether a Hill-Sachs lesion is likely to engage, which informs adding a remplissage or bone block to a stabilisation. Best measured on 3D CT.
Di Giacomo G, et al. Arthroscopy. 2014 (method per Yamamoto and Itoi).
Open calculator →Rotator Cuff Healing Index (RoHI)
Estimates the risk of healing failure after rotator cuff repair from pre-operative factors.
Kwon J, Kim SH, Lee YH, Kim TI, Oh JH. Am J Sports Med. 2019;47(1):173-180.
Open calculator →NJR S-Predict (shoulder replacement)
Estimates the risk of a serious adverse outcome within 90 days of shoulder replacement, to support shared decision-making.
National Joint Registry; model built on NJR data by the Universities of Oxford, Bristol and Copenhagen.
Open calculator →Clavicle non-union risk
Prognostic index for non-union after non-operative treatment of a diaphyseal (midshaft) clavicle fracture.
Robinson CM, Court-Brown CM, McQueen MM, Wakefield AE. J Bone Joint Surg Am. 2004;86-A(7):1359-1365.
Open calculator →Humeral head ischaemia (Hertel criteria)
Flags the risk of head ischaemia and later avascular necrosis after an intracapsular proximal humerus fracture, which informs the fix-versus-replace decision.
Hertel R, et al. J Shoulder Elbow Surg. 2004;13(4):427-433.
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