@inbook{1160307776, author={E Shamus}, editor={Shamus, Eric}, title={Avascular Necrosis, Femoral Head}, booktitle={Quick Answers: Physiotherapy}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2017}, url={accessphysiotherapy.mhmedical.com/content.aspx?aid=1160307776} }