ABSTRACT
This article compares four widely utilized, yet fundamentally different, approaches for registering medical scans of the head. Comparisons are made on the basis of method, accuracy, robustness, computer requirements, and usability. This examination is intended to provide a means for determining an appropriate method for any given application. These approaches are: 1) an iterative method based on the repeated manual selection of 1-2 corresponding points, 2) an approach using the manual selection of 9-15 corresponding points, 3) an automatic surface matching method, and 4) an automatic approach based on voxel similarity. The methods are tested both on simulated data to provide a gold standard of accuracy, and on real data. All registrations are performed in the same visualization environment created for multipurpose image processing. Simulated data tests provided mean transformation errors and time requirements for the different methods, as well as the displacement errors for a set of anatomical landmarks. These results show all of the methods provide good accuracy when the data is not highly distorted and has a large amount of overlap. From the tests using real data both transformations and time requirements are tabulated for comparison. All of the techniques successfully aligned the real data with the exception of surface matching, which failed on the PET-MRI. Each method exhibits strengths and weaknesses that should be understood in order to utilize the most appropriate technique for a given problem. Based on the authors' examination, the voxel-similarity approach proved in general to be the method of choice.
ABSTRACT
A surgical treatment method consisting in sewing on of the fascia lata on the cartilageless, loaded and needing painless sliding parts of the joint has been presented. In order to transform the fascia into the painless fibrous cartilage, it is necessary to begin early postoperative rehabilitation as soon as at 4-7 days after operation and continue until maximal function and efficiency of the knee is achieved. The follow-up was up to 4 years and full function was found in 11 patients, improvement after partial patients, and no improvement in 6 patients. Better results were obtained after partial rather than total interposition. Poor results were found in the patients with great contracture and muscular atrophy before operation and with difficulties in rehabilitation caused by other joints. Thus, interpositions is contraindicated in late age, great deformations and difficulties in rehabilitation. This method may fill the empty place in the treatment methods between synovectomy and alloplasty of the knee.
Subject(s)
Arthritis, Rheumatoid/surgery , Fascia/transplantation , Knee Joint/surgery , Movement Disorders/surgery , Adult , Arthritis, Rheumatoid/complications , Exercise Therapy , Female , Humans , Knee Joint/physiopathology , Male , Middle Aged , Movement Disorders/etiology , Movement Disorders/rehabilitation , Postoperative Care , Suture Techniques , ThighABSTRACT
A surgical method of recovery of functional activity and painlessness of the hip deprived of the cartilage in the loaded part has been presented. The operation consisted of interposition with the fascia or a joint capsule flap. The results obtained in 12 patients after 1-12 years of follow-up have been given. Recovery of functional activity was obtained in 8 patients and improvement in 4 patients. In comparison with a group of 32 similar cases of interposition on the background of another etiology; interposition in rheumatoid arthritis gives more good and fair results.
