We report the case of a 12-year-old boy with flexion loss in the left elbow caused by deficient of the concavity corresponding to the coronoid fossa in the distal humerus. The range of motion (ROM) was 15°/100°, and pain was induced by passive terminal flexion. Plain radiographs revealed complete epiphyseal closure, and computed tomography (CT) revealed a flat anterior surface of the distal humerus; the coronoid fossa was absent. Then, the bony morphometric contour was surgically recreated using a navigation system and a three-dimensional elbow joint model. A three-dimensional model of the elbow joint was made preoperatively and the model comprising the distal humerus was milled so that elbow flexion flexion of more than 140° could be achieved against the proximal ulna and radius. Navigation-assisted surgery (contouring arthroplasty) was performed using CT data from this milled three-dimensional model. Subsequently, an intraoperative passive elbow flexion of 135° was obtained. However, active elbow flexion was still inadequate one year after operation, and a triceps lengthening procedure was performed. At the final follow-up one year after triceps lengthening, a considerable improvement in flexion was observed with a ROM of −12°/125°. Plain radiographs revealed no signs of degenerative change, and CT revealed the formation of the radial and coronoid fossae on the anterior surface of the distal humerus. Navigation-assisted surgery for deformity of the distal humerus based on a contoured three-dimensional model is extremely effective as it facilitates evaluation of the bony morphometry of the distal humerus. It is particularly useful as an indicator for milling the actual bone when a model of the mirror image of the unaffected side cannot be applied to the affected side as observed in our case.

To clarify the short-term results of conservative treatment for symptomatic full-thickness tears of the rotator cuff.

Between September 1996 and August 1999, 107 shoulders of 105 patients were diagnosed as full-thickness tears of the rotator cuff by MRI or arthrography at our institute. All patients were treated conservatively and only 3 shoulders underwent surgery because of persistent pain after 6 months of conservative treatment. Among 104 shoulders treated conservatively for more than 12 months, 102 shoulders of 100 patients were followed up with an average follow-up period of 33 months. Two patients were excluded: one had died and the other had been lost at the time of follow up. Among 102 shoulders, 56 shoulders of 56 patients were assessed by direct examination, and 44 shoulders of 46 patients were interviewed by telephone. There were 54 males and 46 females with an average of 64 years (44–80). The Shoulder Functional Evaluation by the Japanese Orthopaedic Association (JOA score) was used for assessment (full score = 75 points)

The overall JOA score improved significantly from 41.3 points (initial) to 63.5 points (follow-up) (p< .01). Satisfactory results (> - 60 points) were obtained in 71%. The pain score (full score = 30 points) improved from 8.3 points (initial) to 24.7 points (follow-up) (p< .01). At follow-up, 49% had no pain and 88% did not need any medication. The range of motion, abduction strength, and activities of daily living improved significantly (p< .01). Angle of external rotation at initial examination was positively correlated with the JOA score at follow-up (r=0.373, p> .01).

Short-term outcome of conservative treatment for symptomatic full-thickness tears of the rotator cuff was satisfactory in 71% of the patients.