1. mark location of anatomic neck
2. measure major diameter of humeral head
3. diameter gives humeral head height
4. check 56 mm height of humeral head to pectorlis
2. measure major diameter of humeral head
3. diameter gives humeral head height
4. check 56 mm height of humeral head to pectorlis
my equations
2D major humeral head diameter * 0.15 -5 = Perform stem size r=.87
3D Messieh line *0.18 -5.5 = Perform stem size r= .89
minor humeral head diameter = .78 Major diameter + 6.3
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An anthropometric analysis to derive formulae for calculating the dimensions of anatomically shaped humeral heads C. Scott Humphrey, MDa, *, Benjamin W. Sears, MDb , Michael J. Curtin, MDc a Humphrey Shoulder Clinic, Eagle, ID, USA b Western Orthopaedics, Denver, CO, USA c St. Luke’s Orthopaedics, Boise, ID, USA
HHH = .3*Major diameter + 3.2
minor diameter humeral head = 0.69 major diameter + 10.8
2D major humeral head diameter * 0.15 -5 = Perform stem size r=.87
3D Messieh line *0.18 -5.5 = Perform stem size r= .89
minor humeral head diameter = .78 Major diameter + 6.3
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An anthropometric analysis to derive formulae for calculating the dimensions of anatomically shaped humeral heads C. Scott Humphrey, MDa, *, Benjamin W. Sears, MDb , Michael J. Curtin, MDc a Humphrey Shoulder Clinic, Eagle, ID, USA b Western Orthopaedics, Denver, CO, USA c St. Luke’s Orthopaedics, Boise, ID, USA
HHH = .3*Major diameter + 3.2
minor diameter humeral head = 0.69 major diameter + 10.8
IM guide inside sizing circle = neutral stem in canal in this case
IM guide thru sizing circle = medialized stem in canal in this case resulting in lateralized humerus