The Influence of Hip Rotation on Femoral Offset Following Short Stem Total Hip Arthroplasty.
Short stem total hip arthroplasty (THA) is thought to be an advantageous surgical option for young patients. Femoral offset has been identified as an important factor for clinical outcome of THA. However, little is known on functional implications of femoral offset after short stem THA. Importantly, hip rotation influences the projected femoral offset and may lead to significant underestimation. Therefore, a novel method to identify and account for hip rotation was applied to a prospectively enrolled series of 37 patients (48 radiographs) undergoing short stem THA. Repeated measurements were performed and intraobserver and interobserver reliability was assessed and femoral offset was corrected for rotation. Based on this study, rotation-correction of femoral offset is of highest relevance for the correct interpretation in future studies.
Department of Orthopaedic and Trauma Surgery, University Hospital of Cologne, Cologne, Germany.
Christoph K
CK
Boese
Department of Orthopaedic and Trauma Surgery, University Hospital of Cologne, Cologne, Germany.
Jan
J
Bredow
Department of Orthopaedic Surgery, Hannover Medical School, Hannover, Germany.
Max
M
Ettinger
Department of Orthopaedic and Trauma Surgery, University Hospital of Cologne, Cologne, Germany.
Peer
P
Eysel
Center for Hip, Knee and Foot Surgery, Sports Traumatology, ATOS Hospital, Heidelberg, Germany.
Fritz
F
Thorey
Center of Orthopedic and Trauma Surgery, University of Giessen and Marburg, Marburg, Germany.
Philipp
P
Lechler
Department of Orthopaedic Surgery, Hannover Medical School, Hannover, Germany.
Stefan
S
Budde
D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D002138:Calibration; D005260:Female; D005269:Femur / Q000601:surgery*; D006621:Hip Joint / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D011446:Prospective Studies; D015203:Reproducibility of Results; D012399:Rotation; D055815:Young Adult
femoral offset; hip anatomy; hip biomechanics; neck-shaft angle; short stem; total hip arthroplasty