Klaue K Sherman M Perren SM Wallin A Looser C Ganz R 1993 The Chiari osteotomy and various shelf procedures are used to augment the weight-bearing area in dysplastic acetabula. The new articular surface derives by metaplasia from the acetabular rim and joint capsule, and is therefore of poorer quality than congruous hyaline cartilage. We reviewed 32 patients after augmentation procedures, using conventional radiographs and three-dimensional reconstruction from CT scans. We showed that Chiari osteotomy and shelf procedures generally achieve less than complete cover, especially over the posterolateral quadrant of the femoral head. Our results suggest that alternative methods which reorientate the whole of the acetabulum are the treatment of choice. Augmentation procedures remain as a salvage option when reorientation is inappropriate or the original hyaline cartilage surface is absent, as in subluxed joints with a secondary acetabulum. Computerised assessment is recommended before operation to assess existing cover and the possible extent of provision of new cover. application/pdf https://sonar.ch/global/documents/46874 eng info:eu-repo/semantics/altIdentifier/doi/10.1302/0301-620X.75B5.8376432 info:eu-repo/semantics/altIdentifier/pmid/8376432 info:eu-repo/semantics/openAccess The Journal of bone and joint surgery. British volume. - 1993 Adolescent Adult Child Female Hip Dislocation Humans Image Processing, Computer-Assisted Middle Aged Osteotomy Radiographic Image Enhancement Tomography, X-Ray Computed Extra-articular augmentation for residual hip dysplasia. Radiological assessment after Chiari osteotomies and shelf procedures. http://purl.org/coar/resource_type/c_6501