Arthroscopic partial repair with versus without biodegradable subacromial spacer for patients with massive rotator cuff tears: a case-control study.

BACKGROUND: To investigate whether arthroscopic partial repair with the additional use of a biodegradable subacromial spacer would be proven better treatment for irreparable massive rotator cuff tears (MRCT) compared to single arthroscopic partial repair. METHODS: A matched-pairs case-control study of 32 patients suffering from irreparable MRCT who underwent an arthroscopic partial repair with (Group B: 16 patients) or without (Group A: 16 patients) InSpace Balloon (ISB®; Orthospace, Caesarea, Israel) implantation was conducted. For the clinical and functional assessment of the patients, the visual analog scale, Constant score, American Shoulder and Elbow Surgeons Shoulder Score (ASES), Range of Motion (RoM), and patients' satisfaction were obtained. RESULTS: The two groups were matched in all baseline demographic and clinical characteristics (n.s.). All mean final quantitative postoperative clinical and functional scores of group A (partial repair and ISB) and group B (single partial repair), as well as active RoM, were significantly improved (t test) in comparison with the mean preoperative values (p < 0.05). No significant differences were observed between the two groups in relation to the two success rate criteria (ASES minimal clinically important difference or MCID > 17, Constant score MCID > 10.4), as well as pain relief and RoM 12 months after surgery. CONCLUSION: Arthroscopic partial repair, either with or without ISB implantation, resulted in significantly improved clinical and functional short-term outcomes for the treatment of MRCT. Patients who were treated with combined partial repair and ISB implantation had a potential propensity toward better functional outcomes and higher patient satisfaction compared to the single-partial-repair-treated group. However, given that these differences were not significant, we feel that further studies are required to clarify the potential therapeutic value of ISB implantation in the treatment of irreparable MRCT. LEVEL OF EVIDENCE: Level III. CLINICAL TRIALS' REGISTRY: German Clinical Trials Register (WHO International Clinical Trials Registry Platform). ID number: DRKS00014725. Date of registration: 07/05/2018.

Non-anatomic arthroscopic repair of massive rotator cuff tears versus anatomic complete arthroscopic repair: a case-control study.

PURPOSE: To investigate whether a non-anatomic arthroscopic repair of massive rotator cuff tear (RCT) produces satisfactory clinical outcomes comparable to those of an anatomic complete arthroscopic repair. METHODS: A retrospective case-control study (prospectively collected data, mean follow-up: 32.7 months ± 29.5; range 12-80 months) was conducted with patients with massive RCT who underwent either an anatomic complete arthroscopic repair (group A: 34 patients) or a non-anatomic arthroscopic repair (partial repair or medialized repair, group B: 30 patients). The rate of success was calculated primarily by the number of patients per group who achieved a minimal clinically important difference between the preoperative and postoperative values of (a) the American Shoulder and Elbow Surgeons Shoulder Score, (b) the constant score and (c) secondarily, the visual analogue scale (VAS-pain). Active range of motion (shoulder forward flexion, abduction, external rotation in 0° and 90° abduction), muscle strength and external rotation lag sign were also assessed. RESULTS: No significant statistical differences amongst groups were found concerning the baseline demographic and clinical characteristics. All postoperative clinical and functional scores were significantly improved in both groups (p < 0.001). According to our primary and secondary success rate criteria, both treatments were found to be successful, whereas there was no significant difference amongst them. CONCLUSIONS: Non-anatomic arthroscopic repair of massive RCT illustrated satisfactory outcomes, which are not significantly different from those reported after an anatomic complete arthroscopic repair.

Direct and selective flow-injection method for the simultaneous spectrophotometric determination of calcium and magnesium in red and white wines using online dilution based on "Zone Sampling".

The present work reports a selective and simple flow injection method for the direct and simultaneous determination of calcium and magnesium ions in red, rose, and white wines. Both ions react with methylthymol blue (MTB) at a strongly basic medium to form colored complexes that are monitored spectrophotometrically (lambda(max) = 610 nm). The simultaneous determination is achieved by online masking of magnesium by 8-hydroxyquinoline (8-HQ). Incorporating an online dilution mode based on the "zone sampling" technique in the FI system, the determination of both analytes was achieved without any pretreatment of the samples, in the range 0-350 mg L(-1) and 0-200 mg L(-1) for Ca(II) and Mg(II), respectively. The 3 sigma detection limits were quite satisfactory (2.1 and 1.8 mg L(-1) for Ca(II) and Mg(II) respectively), and the precision was 1.2% (at a mixture of 100.0 mg L(-1) Ca(II) + 100.0 mg L(-1) Mg(II), n = 12). A detailed study of interferences proved that the proposed method is highly selective. The application of the method to the direct analysis of red, rose, and white wines yielded excellent results compared with those obtained by using FAAS as a reference method (e(r) < 2.8%).