Nicholas Matis

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BACKGROUND Posttraumatic shoulder dislocations with glenoid rim fractures show high rates of dislocation recurrence. For glenoid rim defects exceeding a certain size, several investigators recommend bone grafting. Few reports on anatomical glenoid reconstruction addressing this problem are published. HYPOTHESIS Anatomical glenoid reconstruction by the(More)
BACKGROUND Minimally invasive surgical approaches for total hip replacement, such as the modified Smith-Petersen approach, have been reported to be advantageous over alternative techniques because of reduced soft tissue damage and improved immediate postoperative rehabilitation. This study compares the advantages of the Smith-Petersen approach against the(More)
The number of shoulder arthroplasties has increased over the last decade, which can partly be explained by the increasing use of the reverse total shoulder arthroplasty technique. However, the options for revision surgery after primary arthroplasty are limited in cases of irreparable rotator cuff deficiency, and tuberosity malunion, nonunion, or resorption.(More)
Posttraumatic avascular humeral head necrosis may require salvage shoulder arthroplasty in symptomatic cases. We tested the hypothesis that associated tuberosity malunion negatively influences the final clinical outcome after shoulder arthroplasty. Thirty-eight patients with posttraumatic avascular necrosis of the humeral head were followed clinically and(More)
The authors report about a case of traumatic separation of a horizontally bipartite patella in a young female soccer player. Unspecific anterior knee pain preceded the fracture, which had occurred after an inadequate trauma. Open reduction and osteosynthesis led to bony union with an excellent clinical outcome at follow-up.
BACKGROUND Several arthroscopic methods have been developed to treat posttraumatic recurrent anterior shoulder instability in an attempt to match the results that can be achieved with open repair. The aim of this study was to perform an independent long-term clinical and radiographic evaluation after extra-articular arthroscopic Bankart repair with use of(More)
HYPOTHESIS Irreparable ruptures of the subscapularis tendon lead to impaired function of the shoulder joint. In such cases, transfer of the pectoralis major tendon has led to encouraging results. The procedure fails periodically, typically associated with insufficient in-growth of the transferred tissue. We hypothesized that tendon harvest with chips of(More)
BACKGROUND The J-bone graft technique has previously been reported for anatomic restoration of the bony glenoid surface in cases of posttraumatic recurrent anterior shoulder instability with significant glenoid bone loss. PURPOSE To analyze the physiological remodeling process of the J-bone graft over time. STUDY DESIGN Case series; Level of evidence,(More)
Arthroscopic reinsertion of the supraspinatus and infraspinatus tendons by means of imitation of an open trans osseous reinsertion technique. Tears in the tendon cuffs of the supraspinatus and infraspinatus muscles. Patients < 75 years of age. Retracted tendons that cannot be sufficiently mobilized to provide a tension-free reinsertion. Tears of the tendon(More)
BACKGROUND Several arthroscopic methods have been developed to treat posttraumatic recurrent anterior shoulder instability in an attempt to match the results that can be achieved with open repair. The aim of this study was to perform an independent long-term clinical and radiographic evaluation after extra-articular arthroscopic Bankart repair with use of(More)