title: Periprosthetic bone density changes after MiniHipTMcementless femoral short stem: one-year results of dual-energy X-ray absorptiometry study.
abstract: BACKGROUND
  The purpose of the current study was to investigate the reaction of the femur to the implantation of the MiniHipTMin terms of: (1) bone density change during one year; (2) correlations between stem length, CCD (caput-collum-diaphyseal), femoral offset, T-value, and bone density; (3) other co-variables that influence the change of bone density.
  
  
  METHODS
  MiniHipTMimplant was performed for 62 patients. The age range of the patients who underwent treatment was 25-78 years. Periprothestic bone density was determined within two weeks postoperatively, after three, six, and twelve months utilizing the DEXA scan.
  
  
  RESULTS
  The highest change was observed in the first three months post-implantation, while significant decrease in density was recorded at proximal Gruen zones 1, 2, and 7, and at distal Gruen zone 4. The decrease in density reached a plateau between the third and sixth months after operation. Afterwards, bone density recovered up to the 12th postoperative month. The correlation analysis showed significant difference between Gruen zone 1 and stem size and CCD. The same significant trend was not reached for Gruen zone 7. Femoral offset showed no correlation. Covariance analysis was unable to establish connection of the results with diagnosis, pairings, or gender.
  
  
  CONCLUSIONS
  MiniHipTMdensitometric results are promising and comparable to good results of the other representatives of the femoral neck partially-sustaining short stem prostheses with a lower proximal bone density reduction. Periprosthetic bone resorption is a multifactorial process where stem size, CCD angle, and patient-specific variables such as T-value have an impact on the periprosthetic bone remodeling. In particular, this applies to Gruen zone 1.
authors.affiliation: Department of Orthopedics, Trauma Surgery and Sports Medicine, Johanna Etienne Hospital, AM Hasenberg 46, 41462 Neuss, Germany.
authors.forename: Ahmet
authors.initials: A
authors.lastname: Ercan
authors.affiliation: Orthopaedic Surgery and Traumatology Department, Suez Canal University, Circular Road, 41522 Ismailia, Egypt.
authors.forename: Sherif M
authors.initials: SM
authors.lastname: Sokkar
authors.affiliation: Department of Diagnostic Radiology, Johanna Etienne Hospital, AM Hasenberg 46, 41462 Neuss, Germany.
authors.forename: Gebhard
authors.initials: G
authors.lastname: Schmid
authors.affiliation: Department of Anatomy, Heinrich-Heine University of Duesseldorf, Universitaetsstrasse 1, 40225 Duesseldorf, Germany.
authors.forename: Timm J
authors.initials: TJ
authors.lastname: Filler
authors.affiliation: Orthopaedic Surgery and Traumatology Department, Suez Canal University, Circular Road, 41522 Ismailia, Egypt.
authors.forename: Ashraf
authors.initials: A
authors.lastname: Abdelkafy
authors.affiliation: Department of Orthopedics, Trauma Surgery and Sports Medicine, Johanna Etienne Hospital, AM Hasenberg 46, 41462 Neuss, Germany.
authors.forename: Joerg
authors.initials: J
authors.lastname: Jerosch