ABSTRACT
Incorporating detailed muscle architecture aspects into computational models can enable researchers to gain deeper insights into the complexity of muscle function, movement, and performance. In this study, we employed histological, multiphoton image processing, and finite element method techniques to characterise the mechanical dependency on the architectural behaviour of supraspinatus and infraspinatus mouse muscles. While mechanical tests revealed a stiffer passive behaviour in the supraspinatus muscle, the collagen content was found to be two times higher in the infraspinatus. This effect was unveiled by analysing the alignment of fibres during muscle stretch with the 3D models and the parameters obtained in the fitting. Therefore, a strong dependence of muscle behaviour, both active and passive, was found on fibre orientation rather than collagen content.
Subject(s)
Rotator Cuff , Animals , Mice , Rotator Cuff/physiology , Rotator Cuff/anatomy & histology , Finite Element Analysis , Biomechanical Phenomena/physiology , Models, Biological , Collagen/chemistry , Collagen/metabolism , Male , Mice, Inbred C57BLABSTRACT
With the development of hip prosthesis, younger patients may need more than one revision surgery, with less bone stock available in each subsequent surgery. We retrospectively reviewed the hip revision surgeries in which a Burch-Schneider device has been used. Patients were classified according to the Paprosky score. Functional and clinical evaluation was assessed by the Merlé-Daubigné score. Radiolucencies were assessed by Gill's criteria. Sixteen patients with a mean age of 66.1 years were reviewed at a mean follow-up of 60.7 months. According to Paprosky classification, 18.7% were grade IIb, 56.3% grade IIIa and 25% grade IIIb. The mean Merlé-Daubigné score improved from 10 to 15 points. Radiologically, 12 patients had no radiolucencies, two had grade I radiolucencies and two had grade III radiolucencies. In greater than 50% of acetabular defects, the Burch-Schneider seems to be useful providing clinical and functional improvement. Immediately, non-progressive radiolucencies are not associated with implant loosening at the end of follow-up. The ischial flap should be inserted inside the ischial portion of the acetabulum.
Subject(s)
Arthroplasty, Replacement, Hip/instrumentation , Internal Fixators , Aged , Female , Follow-Up Studies , Hip Prosthesis/adverse effects , Humans , Male , Middle Aged , Reoperation , Retrospective Studies , Risk Factors , Treatment OutcomeABSTRACT
We report a case of a 15-year-old girl who presented with pain and swelling in the right shoulder. Imaging studies showed an inflammatory process well limited at the rotator interval. Open biopsy showed an osteogenic process that was evident in the postoperative X-rays. Two-year follow-up showed a mature ossification at the rotator interval.