Robert H . Cofield

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In rheumatoid arthritis (RA), tissue-infiltrating lymphocytes can be arranged in sophisticated organizations that resemble microstructures usually formed in secondary lymphoid organs. Molecular pathways and host risk factors involved in this process of lymphoid neogenesis remain to be defined. In a series of 64 synovial tissue biopsies, lymphoid follicles(More)
Nine humeral fractures occurred subsequent to 499 shoulder arthroplasties that had been performed between December 1978 and November 1987 at the Mayo Clinic. The time from the arthroplasty to the fracture averaged thirty-nine months (range, eight to 101 months). Seven patients were women and two were men, and the average age was seventy years (range,(More)
Forty-eight shoulders that underwent glenoid component revision surgery were reviewed at a mean of 4.9 years (range, 2 to 12 years). The indications for surgery were glenoid component loosening in 29 shoulders, glenoid implant failure in 14 shoulders, and glenoid component malposition or wear leading to instability in 5 shoulders. Seventeen shoulders had(More)
We determined the outcome of 113 total shoulder replacement arthroplasties performed with a Neer prosthesis between 1975 and 1981. The operations were performed for the treatment of osteoarthritis, rheumatoid arthritis, and old fractures or dislocations with traumatic arthritis. The probability of implant survival was 93% after 10 years and 87% after 15(More)
During the period from 1970 through 1979, proximal humeral arthroplasty with prostheses of the Neer design was performed in 49 shoulders (48 patients) with complex acute or chronic fractures and fracture-dislocations of the proximal humerus. Follow-up evaluation included physical and roentgenographic examination at least two years after surgery for 43 of(More)
All patients treated for a first-time anterior glenohumeral dislocation in Olmsted County, Minnesota, from 1970 through 1979 were identified. Of these 124 patients, 116 were available for study at a mean followup of 4.63 years (range 2 to 11). Of the 116 patients, 38 (33%) had recurrence of dislocation: 21 of the 32 (66%) patients less than 20 years old, 17(More)
BACKGROUND Rotator cuff disease or injury is one of the most frequently seen orthopaedic conditions, and surgical repair of rotator cuff tears is a common procedure. A prospective analysis of the operation, with consistent assessment of patient characteristics, variables associated with the rotator cuff tear and repair techniques, and outcome factors, was(More)
Seventy-one shoulders of seventy patients were fused for treatment of various conditions, and the results were analyzed after an average follow up of nine years and six months. The operative technique always included the use of internal fixation. The average position of arthrodesis was 45 degrees of abduction and 25 degrees of flexion of the arm, with the(More)
Between 1972 and 1994, 2279 patients underwent primary shoulder arthroplasty (2512 shoulders) and 194 patients underwent revision shoulder arthroplasty (222 shoulders) at the authors' institution. Of these, 18 patients with primary shoulder arthroplasties (19 shoulders) and seven patients with revision shoulder arthroplasties (seven shoulders) were(More)
Between January 1, 1976 and December 31, 1991, 195 total shoulder arthroplasties and 108 hemiarthroplasties were performed in 247 patients in patients with rheumatoid arthritis. One hundred and eighty-seven total shoulder arthroplasties and 95 hemiarthroplasties with complete preoperative evaluation, operative records, and minimum 2-year follow-up (mean,(More)