Junior surgeon learning curve for performing digital planning of a first-line uncemented total hip prothesis.

PURPOSE: Preoperative digital planning of total hip arthroplasty (THA) anticipates difficulties while increasing implant survival. The objective was to establish the learning curve to produce a reliable and reproducible preoperative planning for THA. We hypothesize that a learning curve exists for planning, and we want to determine the number of procedures required to accomplish it. METHODS: This prospective study included patients for THA from 02/11/2019 to 01/11/2022. Ten junior (Juniors) and senior surgeons (Seniors) had received dedicated training in the use of the software. Modeling was done blindly by Juniors and Senior before surgery on a standardized front pelvis X-ray (mediCAD 2D Classic Hospital software). Statistical analyses to establish the learning curve were done to compare the Juniors and Seniors. RESULTS: 60% of the Juniors achieved competence after 31.5 ± 12.9 [14-54] planning sessions for the acetabular implant, and 80% after 30.3 ± 8.3 [17-40] planning sessions for the femoral implant. Femoral neck size was achieved by all ten Juniors after 23.1 ± 6.8 [17-38] planning. The offset was correctly restored on the plan by 30% of the Juniors after 33.5 ± 11.6 [18-46] planning. CONCLUSION: There is a learning curve for 2D planning of uncemented THA. The different planning items seem to have different learning curves. Compared to Seniors, the completion of 75 planning sessions is not sufficient in totality. The competence of the Juniors for the acetabular implant, the length of the neck and the size of the femoral stem are mostly acquired before 75 sessions. LEVEL OF EVIDENCE: Prospective study-Level II.

[Syndrome of calcifications of basal ganglia, leukodystrophy and chronic lymphomonocytic pleocytosis of the cerebrospinal fluid: report of a case]. / Síndrome de calcificações dos gânglios da base, leucodistrofia e pleocitose linfomonocitária crônica do líquido cefalorraqueano: registro de um caso.

Norman & Tingey (1966) reported a new syndrome of micrencephaly, strio-cerebellar calcifications and leucodystrophy and in 1968, Lyon & col. reported the same syndrome plus dwarfism. These authors did not describe cerebrospinal fluid (CSF) alterations. In 1984, Aicardi & Goutièrres described 8 children from 5 different families with a syndrome like above referred to but with chronic CSF lymphocytosis; all patients had a progressive evolution, with familial character, with probable autosomic recessive heritage. It is the purpose of this report to relate a case similar to Aicardi & Goutièrres' cases in a male caucasian patient of jewish ashkenazim origin with 6 and a half month of age, but with a study of CSF lymphocytes T and B. Diminished T-subpopulations of active and avid-T were found suggesting local signalization of antibodies in the central nervous system. The differential diagnosis and that strange combination of a probable genetic etiology and an immunitary process revealing a local inflammatory process are discussed.