NCT02189408.

MRI evidence and clinical examination suggest that cam impingement is more common in elite athletes in comparison to non-athletes. At a professional level, the intense practice of track and field athletics is susceptible for FAI.

The purpose of this article was to evaluate the different techniques of operative treatment of primary synovial chondromatosis (PSC) of the hip. We performed a systematic review of literature of PSC and also present one case report about arthroscopic treatment of PSC. Our study compares both established operative procedures, open versus arthroscopic surgery, and shows each advantages and complications. One hundred and forty-seven publications were found in a PubMed literature review searching the terms: "synovial chondromatosis", "synovial osteochondromatosis", "synovial metaplasia" and "hip". All included studies were divided into open surgery or arthroscopic surgery concerning the therapeutic strategy and the corresponding results. We could find a total number of 3 reviews about PSC of the hip relating to operative procedures. One patient presented to our outpatient clinic with PSC. After other pathologies causing hip pain were excluded, the patient underwent hip arthroscopy with excision of the loose bodies and partial synovectomy. Diagnosis of PSC was confirmed by histopathology. The patient was examined before and one year after surgery with the Visual Analogue Scale (VAS) and the Hip Outcome Score (HOS ADL). Resecting PSC by hip arthroscopy is a minor surgical, but demanding procedure with minimal risks, even useful in the treatment of elderly patients with moderate osteoarthritis.

This study investigates the adhesion capacity of a polyglycolic acid- (PGA-) hyaluronan scaffold with a structural modification based on a planar polymer (PM) surface in a cadaver cartilage defect model. Two cadaver specimens were used to serially test multiple chondral matrices. In a cadaver hip model, cell free polymer-based cartilage implants with a planar bioinspired PM surface (PGA-PM-scaffolds) were implanted arthroscopically on 10 mm × 15 mm full-thickness femoral hip cartilage lesions. Unprocessed cartilage implants without a bioinspired PM surface were used as control group. The cartilage implants were fixed without and with the use of fibrin glue on femoral hip cartilage defects. After 50 movement cycles and removal of the distraction, a rearthroscopy was performed to assess the outline attachment and integrity of the scaffold. The fixation techniques without and with fibrin fixation showed marginal differences for outline attachment, area coverage, scaffold integrity, and endpoint fixation after 50 cycles. The PGA-PM-scaffolds with fibrin fixation achieved a higher score in terms of the attachment, integrity, and endpoint fixation than the PGA-scaffold on the cartilage defect. Relating to the outline attachment, area coverage, scaffold integrity, and endpoint fixation, the fixation with PGA-PM-scaffolds accomplished significantly better results compared to the PGA-scaffolds (P = 0.03752, P = 0.03078, P = 0.00512, P = 0.00512). PGA-PM-scaffolds demonstrate increased observed initial fixation strength in cadaver femoral head defects relative to PGA-scaffold, particularly when fibrin glue is used for fixation.

The simultaneous use of different techniques for cartilage repair may provide alternative operative solutions for single complex cases, although further studies are required for a general recommendation.