{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T23:39:20Z","timestamp":1790638760039,"version":"4.1.0"},"reference-count":36,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2005,2,18]],"date-time":"2005-02-18T00:00:00Z","timestamp":1108684800000},"content-version":"vor","delay-in-days":7719,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal Orthopaedic Research"],"published-print":{"date-parts":[[1984,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The bipolar endoprosthesis was designed to alleviate problems encountered with conventional hip endoprostheses. Recent designs have advocated the use of offset centers of rotation between the inner and outer jointbearing surfaces to generate a valgus\u2010producing moment on loading (antivarus head dynamics). This study was undertaken to justify this biomechanical feature by performing (a) cyclic loading of the bipolar head in the varus position, (b) analysis of motion between the inner and outer bearing surfaces, and (c) evaluation of antivarus head dynamic function. Four endoprosthetic designs were studied: the Bateman UPF, Osteonics UHR, Giliberty II, and Bi\u2010Centric. Significant plastic deformation occurred in the UPF and UHR prostheses when loaded in an extreme varus position. Theoretically, motion is most likely to occur at the inner bearing if the frictional coefficients are equal at both surfaces. The UHR prosthesis with eccentric offset of bearing centers can provide the antivarus effect in laboratory conditions. Whether the antivarus effect and\/or the dominant inner bearing motion will occur <jats:italic>in vivo<\/jats:italic> awaits careful clinical study.<\/jats:p>","DOI":"10.1002\/jor.1100020408","type":"journal-article","created":{"date-parts":[[2005,2,24]],"date-time":"2005-02-24T13:18:53Z","timestamp":1109251133000},"page":"356-368","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":31,"title":["Biomechanics of bipolar hip endoprostheses"],"prefix":"10.1002","volume":"2","author":[{"given":"S. W.","family":"Krein","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"E. Y. S.","family":"Chao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2005,2,18]]},"reference":[{"key":"e_1_2_1_2_2","doi-asserted-by":"crossref","first-page":"1049","DOI":"10.2106\/00004623-196446050-00009","article-title":"Femoral\u2010head prostheses\u2014A review of three hundred and fifty\u2010six operations and their results","volume":"46","author":"Anderson LD","year":"1965","journal-title":"J Bone Joint Surg [Am]"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1001\/jama.240.19.2079"},{"key":"e_1_2_1_4_2","doi-asserted-by":"crossref","first-page":"777","DOI":"10.2106\/00004623-197961050-00024","article-title":"Postoperative separation of the femoral and acetabular components of a single\u2010assembly total hip (Bateman) replacement","volume":"61","author":"Barmada R","year":"1979","journal-title":"J Bone Joint Surg [Am]"},{"key":"e_1_2_1_5_2","first-page":"15","article-title":"Single\u2010assembly total hip prosthesis\u2014Preliminary report","volume":"2","author":"Bateman JE","year":"1974","journal-title":"Orthop Digest"},{"key":"e_1_2_1_6_2","first-page":"242","article-title":"Experience with a multi\u2010bearing implant in reconstruction for hip deformities","volume":"1","author":"Bateman JE","year":"1977","journal-title":"Orthop Trans"},{"key":"e_1_2_1_7_2","first-page":"349","article-title":"Results after hemiarthroplasty of the hip using a cemented femoral prosthesis","volume":"52","author":"Beckenbaugh RD","year":"1977","journal-title":"Mayo Clin Proc"},{"key":"e_1_2_1_8_2","doi-asserted-by":"crossref","first-page":"165","DOI":"10.1097\/00003086-198201000-00026","article-title":"Use of the Giliberty bipolar endoprosthesis in femoral neck fractures","volume":"162","author":"Bhuller GS","year":"1982","journal-title":"Clin Orthop"},{"key":"e_1_2_1_9_2","doi-asserted-by":"crossref","first-page":"437","DOI":"10.1302\/0301-620X.57B4.437","article-title":"Thompson prosthesis for fractured neck of femur","volume":"57","author":"Chan RN\u2010W","year":"1975","journal-title":"J Bone Joint Surg [Br]"},{"key":"e_1_2_1_10_2","doi-asserted-by":"crossref","first-page":"279","DOI":"10.1302\/0301-620X.58B3.182698","article-title":"Treatment of fractures of the femoral neck by replacement with the Thompson prosthesis","volume":"58","author":"D'Arcy J","year":"1976","journal-title":"J Bone Joint Surg [Br]"},{"key":"e_1_2_1_11_2","first-page":"128","article-title":"Aetiology of acetabular erosion after Thompson replacement for fractured necks of femur [Abstract]","volume":"59","author":"Devas M","year":"1977","journal-title":"J Bone Joint Surg [Br]"},{"key":"e_1_2_1_12_2","first-page":"242","article-title":"The universal proximal femoral endoprosthesis\u2010II","volume":"1","author":"Drinker H","year":"1977","journal-title":"Orthop Trans"},{"key":"e_1_2_1_13_2","doi-asserted-by":"crossref","first-page":"1167","DOI":"10.2106\/00004623-197961080-00005","article-title":"The universal proximal femoral endoprosthesis. A short\u2010term comparison with conventional hemiarthroplasty","volume":"61","author":"Drinker H","year":"1979","journal-title":"J Bone Joint Surg [Am]"},{"key":"e_1_2_1_14_2","first-page":"40","article-title":"A new concept of a bipolar endoprosthesis","volume":"3","author":"Giliberty RP","year":"1974","journal-title":"Orthop Rev"},{"key":"e_1_2_1_15_2","first-page":"38","article-title":"Low\u2010friction bipolar hip endoprosthesis","volume":"62","author":"Giliberty RP","year":"1977","journal-title":"Int Surg"},{"key":"e_1_2_1_16_2","first-page":"27","article-title":"A retrospective study of the bipolar hip endoprosthesis","volume":"7","author":"Giliberty RP","year":"1978","journal-title":"Orthop Rev"},{"key":"e_1_2_1_17_2","doi-asserted-by":"crossref","first-page":"223","DOI":"10.2106\/00004623-196446020-00001","article-title":"Primary prosthetic replacement in fresh femoral neck fractures","volume":"46","author":"Hinchey JJ","year":"1964","journal-title":"J Bone Joint Surg [Am]"},{"key":"e_1_2_1_18_2","doi-asserted-by":"publisher","DOI":"10.1002\/bjs.1800610514"},{"key":"e_1_2_1_19_2","first-page":"686","article-title":"Nailing versus prosthesis for femoral\u2010neck fractures","volume":"57","author":"Johnson JTH","year":"1975","journal-title":"J Bone Joint Surg [Am]"},{"key":"e_1_2_1_20_2","doi-asserted-by":"publisher","DOI":"10.2106\/00004623-197961050-00001"},{"key":"e_1_2_1_21_2","first-page":"169","article-title":"The Giliberty bipolar prosthesis. A clinical and radiographical review","volume":"141","author":"Langan P","year":"1979","journal-title":"Clin Orthop"},{"key":"e_1_2_1_22_2","doi-asserted-by":"crossref","first-page":"373","DOI":"10.3928\/0147-7447-19790701-08","article-title":"The Bateman UPF prosthesis. A 48\u2010month experience","volume":"2","author":"Lestrange NR","year":"1979","journal-title":"Orthopedics"},{"key":"e_1_2_1_23_2","first-page":"57","article-title":"New concepts in femoral head replacement: Clinical experiences","volume":"38","author":"Liebowitz S","year":"1977","journal-title":"Bull Hosp Joint Dis"},{"key":"e_1_2_1_24_2","first-page":"198","article-title":"Bateman UPF prosthesis in fractures of the femoral neck","volume":"152","author":"Long JW","year":"1980","journal-title":"Clin Orthop"},{"key":"e_1_2_1_25_2","doi-asserted-by":"publisher","DOI":"10.2106\/00004623-195739040-00005"},{"key":"e_1_2_1_26_2","doi-asserted-by":"publisher","DOI":"10.1016\/B978-1-4831-6701-5.50040-1"},{"key":"e_1_2_1_27_2","volume-title":"Der Schenkelhalsbruch, ein Mechanisches Problem","author":"Pauwels F","year":"1935"},{"key":"e_1_2_1_28_2","first-page":"516","volume-title":"Formulas for Stress and Strain","author":"Roark RJ","year":"1975"},{"key":"e_1_2_1_29_2","doi-asserted-by":"crossref","first-page":"516","DOI":"10.2106\/00004623-197355030-00007","article-title":"Long\u2010term results of femoral\u2010head replacement","volume":"55","author":"Salvati EA","year":"1973","journal-title":"J Bone Joint Surg [Am]"},{"key":"e_1_2_1_30_2","doi-asserted-by":"crossref","first-page":"974","DOI":"10.3928\/0147-7447-19801001-05","article-title":"The Bateman universal proximal femoral assembly: Experiences with 80 cases","volume":"3","author":"Schildhaus AIE","year":"1980","journal-title":"Orthopedics"},{"key":"e_1_2_1_31_2","first-page":"59","article-title":"New concepts in femoral head replacement: The place of the Bateman prosthesis in hip surgery","volume":"38","author":"Simon SR","year":"1977","journal-title":"Bull Hosp Joint Dis"},{"key":"e_1_2_1_32_2","doi-asserted-by":"publisher","DOI":"10.2106\/00004623-195436030-00003"},{"key":"e_1_2_1_33_2","first-page":"122","volume-title":"Theory of Elasticity","author":"Timoshenko S","year":"1951"},{"key":"e_1_2_1_34_2","first-page":"356","article-title":"The Bateman endoprosthesis: 104 arthroplasties","volume":"4","author":"VanDemark RE","year":"1980","journal-title":"Orthop Trans"},{"key":"e_1_2_1_35_2","doi-asserted-by":"crossref","first-page":"662","DOI":"10.2106\/00004623-197860050-00013","article-title":"Thermal deformation of polyethylene in a total knee prosthesis","volume":"60","author":"Volz RG","year":"1978","journal-title":"J Bone Joint Surg [Am]"},{"key":"e_1_2_1_36_2","first-page":"17","article-title":"Evaluation of the Bateman self\u2010articulating femoral prosthesis","volume":"3","author":"West WF","year":"1979","journal-title":"Orthop Trans"},{"key":"e_1_2_1_37_2","doi-asserted-by":"publisher","DOI":"10.1097\/00005373-197209000-00009"}],"container-title":["Journal of Orthopaedic Research"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1002%2Fjor.1100020408","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/jor.1100020408","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,10,20]],"date-time":"2023-10-20T02:33:06Z","timestamp":1697769186000},"score":1,"resource":{"primary":{"URL":"https:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/jor.1100020408"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1984,1]]},"references-count":36,"journal-issue":{"issue":"4","published-print":{"date-parts":[[1984,1]]}},"alternative-id":["10.1002\/jor.1100020408"],"URL":"https:\/\/doi.org\/10.1002\/jor.1100020408","archive":["Portico"],"relation":{},"ISSN":["0736-0266","1554-527X"],"issn-type":[{"value":"0736-0266","type":"print"},{"value":"1554-527X","type":"electronic"}],"subject":[],"published":{"date-parts":[[1984,1]]},"assertion":[{"value":"2005-02-18","order":2,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}