Bone Rigidity: Assessing the Impact of Malignant Lesions

Jay D. Lenn

In mechanical engineering, beam theory is a calculation that factors in both the geometric and material properties of a beam to determine its rigidity. A change in either property affects the loadbearing abilities of the beam. In metastatic bone disease, malignant lesions affect both the geometric and material properties of bone.

EWI in Action: The Military Orthopaedic Trauma Registry

MAJ Jessica C. Rivera, MD; LtCol (Ret) Renee M. Greer; Joseph C. Wenke, PhD; COL (Ret) James R. Ficke, MD; LTC Anthony E. Johnson, MD

Through the ages, military medicine has contributed to medical advancements in trauma care by the sheer necessity and creativity required to care for large numbers of severely injured persons. Since the Vietnam War, conflicts involving American military personnel have brought to light certain deficiencies in optimal combat casualty care.

AJRR Gains Momentum

Caryn D. Etkin, PhD, MPH; Lori Boukas

The American Joint Replacement Registry (AJRR) continues to build a robust national database of primary and revision hip and knee replacement surgeries. As of October 2014, AJRR has enrolled close to 400 hospitals and includes more than 80,000 procedures. The number of hospitals joining and the AJRR’s continued commitment to build a national registry make this an exciting time in the organization’s history.