Stepwise introduction of a bone-conserving osseointegrated hip arthroplasty using RSA and a randomized study: I. Preliminary investigations—52 patients followed for 3 years

Lars V Carlsson Department of Biomaterials Research, Institute of Surgical Sciences, University of Gothenburg, SE-413 90, Gothenburg; Department of Orthopaedics, Sahlgrenska University Hospital, University of Gothenburg, SE-413 45, GothenburgCorrespondence[email protected]

Björn E J Albrektsson Department of Orthopaedics, Östra Hospital, SE-416 85, Gothenburg

Björn G Albrektsson Department of Biomaterials Research, Institute of Surgical Sciences, University of Gothenburg, SE-413 90, Gothenburg

Tomas O Albrektsson Department of Biomaterials Research, Institute of Surgical Sciences, University of Gothenburg, SE-413 90, Gothenburg

C Magnus Jacobsson Department of Biomaterials Research, Institute of Surgical Sciences, University of Gothenburg, SE-413 90, Gothenburg

Warren Macdonald Department of Biomaterials Research, Institute of Surgical Sciences, University of Gothenburg, SE-413 90, Gothenburg

Lars Regnér Department of Orthopaedics, Sahlgrenska University Hospital, University of Gothenburg, SE-413 45, Gothenburg

Tord Röstlund Department of Biomaterials Research, Institute of Surgical Sciences, University of Gothenburg, SE-413 90, Gothenburg

Lars R Weidenhielm Department of Orthopaedic Surgery, Karolinska Hospital, SE-171 76, Stockholm, Sweden

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Stepwise introduction of a bone-conserving osseointegrated hip arthroplasty using RSA and a randomized study: I. Preliminary investigations—52 patients followed for 3 years

Table 1. RSA femoral accuracy at the 95% confidence interval from repeated examinations. Rotation around and translation along the cardinal axes for the GOT and Spectron stems

Table 2. Acetabular accuracy of RSA at the 95% confidence interval from repeated examinations. Rotation around and translation along the cardinal axes for the GOT and Harris Galante II cups

Table 3. Harris Hip Score and pain using Visual Analog Scale

Table 4. Femoral component translation measured by RSA; MTPM of the center of the head for the GOT and Spectron stems. MTPM (maximal total point motion) is the vector sum of migration measured in the 3 axial directions. In mm, mean (standard deviation)

Table 5. Component rotation as measured by RSA around the x-, y- and z-axes for the GOT and Spectron stems. In degrees, mean (standard deviation)

Table 6. RSA measures of cup rotation for the GOT and Harris-Galante II implants. In degrees, median (standard deviation)

Table 7. RSA measures of cup translation for the GOT and Harris-Galante II implants. In mm; median (standard deviation)

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Stepwise introduction of a bone-conserving osseointegrated hip arthroplasty using RSA and a randomized study: I. Preliminary investigations—52 patients followed for 3 years

Figures & data

Table 1. RSA femoral accuracy at the 95% confidence interval from repeated examinations. Rotation around and translation along the cardinal axes for the GOT and Spectron stems

Table 2. Acetabular accuracy of RSA at the 95% confidence interval from repeated examinations. Rotation around and translation along the cardinal axes for the GOT and Harris Galante II cups

Table 3. Harris Hip Score and pain using Visual Analog Scale

Table 4. Femoral component translation measured by RSA; MTPM of the center of the head for the GOT and Spectron stems. MTPM (maximal total point motion) is the vector sum of migration measured in the 3 axial directions. In mm, mean (standard deviation)

Table 5. Component rotation as measured by RSA around the x-, y- and z-axes for the GOT and Spectron stems. In degrees, mean (standard deviation)

Table 6. RSA measures of cup rotation for the GOT and Harris-Galante II implants. In degrees, median (standard deviation)

Table 7. RSA measures of cup translation for the GOT and Harris-Galante II implants. In mm; median (standard deviation)

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