Component Motion in Bipolar Cemented Hemiarthroplasty

Eiskjær, Søren Peter; Boll, K L; Gelineck, John

doi:10.1097/00005131-198912000-00010

Cited by 27 publications

(16 citation statements)

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“…In the bipolar group the acetabular erosion was significantly less at 12 months, but the rate of acetabular erosion then increased and at the later follow-ups there were no differences between the groups. This supports the previously reported finding that the bipolar articulation ceases to work after some time and thereby turns the bipolar prosthesis into a unipolar system [24][25][26][27]. Even if the HRQoL was better in the bipolar group at the last follow-up we found no correlation between presence of acetabular erosion and impairment in EQ-5D index score or HHS pain score at any of the follow-ups.…”

Section: Health-related Quality Of Life and Hip Functionsupporting

confidence: 90%

Unipolar hemiarthroplasty versus bipolar hemiarthroplasty in patients with displaced femoral neck fractures. A four-year follow-up of a randomised controlled trial

Inngul

Hedbeck

Blomfeldt

et al. 2013

International Orthopaedics (SICOT)

111

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Section: Health-related Quality Of Life and Hip Functionsupporting

confidence: 90%

Unipolar hemiarthroplasty versus bipolar hemiarthroplasty in patients with displaced femoral neck fractures. A four-year follow-up of a randomised controlled trial

Inngul

Hedbeck

Blomfeldt

et al. 2013

International Orthopaedics (SICOT)

111

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“…However, statistical difference was only noted at 1 year follow-up and the acetabular erosion rate increased at the later follow-ups with no significance observed (Figure 3 ). This may be because the bipolar articulation loses mobility with time and functions as a UH [ 18 , 26 , 32 - 35 ]. In addition, it should be recognized that this result should be interpreted with caution until confirmed by future studies, because the number of the pooled studies is small and the studies are of small sample size.…”

Section: Discussionmentioning

confidence: 99%

Unipolar versus bipolar hemiarthroplasty for displaced femoral neck fractures: a systematic review and meta-analysis of randomized controlled trials

Jia

Ding

et al. 2015

J Orthop Surg Res

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BackgroundWhether bipolar hemiarthroplasty (BH) for displaced femoral neck fractures has benefit over unipolar hemiarthroplasty (UH) remains controversial. We conducted a systematic review and meta-analysis of randomized controlled trials (RCTs) to evaluate the relative effects between BH and UH.MethodsA systematic literature search (up to April, 2014) was conducted to include RCTs comparing BH with UH for displaced femoral neck fractures. Two authors independently assessed methodological quality of the included studies and extracted data. Surgical information and postoperative outcomes were analyzed.ResultsA total of 10 RCTs including 1,190 patients were indentified. Our results demonstrated that BH was associated with similar or better outcomes in hip function, hip pain, and quality of life while with a higher cost compared with UH. Moreover, there were no significant differences between BH and UH with regard to operation time, blood loss, blood transfusion, hospital stay, mortality, reoperation, dislocation, and complications. BH could significantly decrease the incidence of acetabular erosion at 1 year follow-up compared with UH (RR = 0.24, 95% confidence interval (CI) = 0.06 to 0.89, P = 0.03), but no significant difference was observed at 4 months, 2 years, and 4 years follow-ups.ConclusionsBased on the current evidence, BH is not superior to UH in terms of surgical information and postoperative results. Despite similar or better clinical outcomes compared with UH, BH with a higher cost could not decrease long-term acetabular erosion rate.

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“…The extent to which the motions in the two prosthetic joints are preserved after a certain period of time has not been clearly defined. In addition, studies on the motion distribution of bipolar hip prostheses in vivo have reported conflicting results (Drinker and Murray 1979, Verberne 1983, Cabanela and VanDemark 1984, Phillips 1987, Bednar et al 1988, Bochner et al 1988, Chen et al 1989, Eiskjaer et al 1989, Mess and Barmada 1990, Rowe et al 1994, Wada et al 1997.…”

Section: Discussionmentioning

confidence: 99%

Why does outer joint motion predominate in bipolar hip prosthesis?Experimental and clinical studies

Rowe

Chung

Moon

et al. 2004

Acta Orthopaedica Scandinavica

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Background Theoretically, the motion of a bipolar hip prosthesis is most likely to occur at the inner joint if the frictional coefficients are equal at both surfaces. However, many studies have suggested that most motion occurs at the outer joint.Material and methods We performed an analysis of motion in a cadaveric bone model and in 50 patients during fluoroscopic examination, to determine how the motion is distributed between the two joints and what factors contribute to this distribution. ResultsThe motion distributions varied widely between the patients. However, there was a relative preponderance (63-90%) of outer motion in all directions of leg movement in addition to a persistent coexistence of motion at both joints in 44 of 50 patients. This preponderance of outer motion was the result of an early impingement of the acetabular cup and structural differences between the two joints.Interpretation An adjustment of the positive eccentricity and a decrease in the frictional torque of the inner joint as a result of better lubrication and smoothness can be expected to improve the motion distribution, thus reducing the amount of acetabular erosion.

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Component Motion in Bipolar Cemented Hemiarthroplasty

Cited by 27 publications

References 0 publications

Unipolar hemiarthroplasty versus bipolar hemiarthroplasty in patients with displaced femoral neck fractures. A four-year follow-up of a randomised controlled trial

Unipolar hemiarthroplasty versus bipolar hemiarthroplasty in patients with displaced femoral neck fractures. A four-year follow-up of a randomised controlled trial

Unipolar versus bipolar hemiarthroplasty for displaced femoral neck fractures: a systematic review and meta-analysis of randomized controlled trials

Why does outer joint motion predominate in bipolar hip prosthesis?Experimental and clinical studies

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