Changes

[[File:Femoral offset in hemiarthroplasty.jpg|thumb|Femoral offset in hemiarthroplasty.]]The main measure after hemiarthroplasty is femoral (neck) offset, which is defined as the perpendicular distance between the intramedullary or longitudinal axis of the femur and the center of rotation of the native or prosthetic femoral head. An unnatural offset, as compared to the contralateral side, is associated with hip dislocation.<ref name="JonesBriffa2017">{{cite journal|last1=Jones|first1=Carl|last2=Briffa|first2=Nikolai|last3=Jacob|first3=Joshua|last4=Hargrove|first4=Richard|title=The Dislocated Hip Hemiarthroplasty: Current Concepts of Etiological factors and Management|journal=The Open Orthopaedics Journal|volume=11|issue=Suppl-7, M4|year=2017|pages=1200–1212|issn=1874-3250|doi=10.2174/1874325001711011200}}</ref>]]The main measure after hemiarthroplasty is femoral (neck) offset, which is defined as the perpendicular distance between the intramedullary or longitudinal axis of the femur and the center of rotation of the native or prosthetic femoral head. An unnatural offset, as compared to the contralateral side, is associated with hip dislocation.<ref name="JonesBriffa2017"/>

'''Cement''' coverage is regarded as acceptable when there are no translucent zones on an anteroposterior image in at least 6 of 7 Gruen-zones.<ref name=SOA/>  [[File:Hip prosthesis zones by DeLee and Charnley system, and Gruen system.jpg|thumb|250px|center|Hip prosthesis zones according to DeLee and Charnley,<ref>{{cite book|title=The Adult Hip, Volume 1|url=https://books.google.com/books?id=-fwULYB1gJIC&pg=PA958|author=John J. Callaghan, Aaron G. Rosenberg, Harry E. Rubash|publisher=Lippincott Williams & Wilkins|year=2007|isbn=978-0-7817-5092-9|page=958}}</ref> and Gruen.<ref>{{cite journal|last1=Neumann|first1=Daniel R.P.|last2=Thaler|first2=Christoph|last3=Hitzl|first3=Wolfgang|last4=Huber|first4=Monika|last5=Hofstädter|first5=Thomas|last6=Dorn|first6=Ulrich|title=Long-Term Results of a Contemporary Metal-on-Metal Total Hip Arthroplasty|journal=The Journal of Arthroplasty|volume=25|issue=5|year=2010|pages=700–708|issn=0883-5403|doi=10.1016/j.arth.2009.05.018}}</ref> These are used to describe the location of for example areas of loosening.]] Absence of cement in zone 7 (medially-proximally) needs to be noted. On a lateral image, the distal tip of the prosthesis should be centered, and not be in contact with the cortex.<ref name=SOA/> The cup should not have translucent zones in zone 1 and 2. It is acceptable to have translucent zones in parts of zone 3.<ref name=SOA/>