Neer, Charles

The number of shoulder arthroplasty procedures done yearly has grown from an estimated 5000 per year in the United States between 1990 and 1992 (Wirth and Rockwood, Jr. 1996) to around 15,000 per year between 2002 and 2003 (Jackson 2003). Of these, a substantial portion are hemiarthroplasties. The prevalence of hemiarthroplasties as a percentage of the total number of replacements ranges from 14% (Edwards et al. 2002) in a multicenter study of OA, to 65% in a study of fracture repair (Boileau et al. 2001), to 87% in the Swedish shoulder arthroplasty register started in 1999 (Rahme, Jacobsen, and Salomonsson 2(X)1). Dr. Charles Neer, II, the pioneer of tiie procedure, estimates that overall, aroimd 20% of shoulder replacements are hemiarthroplasties (2003). 

The modern era of shoulder replacement was ushered in by Dr. Charles Neer, II. In 1953, in response to the relatively poor results of humeral head resection for patients with proximal humeral fractures. Dr. Neer implanted a vital-hum humeral component of his own design in a hemiarthroplasty procedure (Figure 9.4). In 1955, he reported on his first series of 12 pahents treated in this way. 

Brown, John Fiske, Kenneth S. Obenski, and Thomas R. Osborn. Forensic En neering Reconstruction of Accidents. Springfield, HI. Charles C. Thomas, 2002. Important concepts written in an easily imderstood manner for professionals other than engineers. Franck, Harold, and Darren Franck. Mathematical Methods for Accident Reconstruction A Forensic En-gmeering Perspective. Boca Raton, Fla. GRG Press, 2010. The principles of mathematics and physics are applied to the models demonstrating accident reconstruction. 

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