BackgroundThe onset of deep vein thrombosis (DVT) in patients after total hip arthroplasty (THA) may expand or enlarge and subsequently lead to significant mortality. The objective of this study was to investigate potential risk factors for DVT in patients after THA.MethodsEligible patients with hip joint diseases who were scheduled for unilateral primary THA at our hospital were prospectively included into this study. The demographic and clinical features, preoperative plasma biomarkers were detailed, recorded, and compared. The multiple logistic regression analysis was used to evaluate potential risk factors for DVT.ResultsA total of 214 subjects were enrolled into our study cohort for the final analysis, and 23 of them have suffered DVT with an incidence of 9.5%. The performance of logistic regression analysis showed that preoperative expression of plasminogen activator inhibitor-1 (PAI-1) was an independent risk factor for the onset of DVT in patients after THA (OR 1.18, 95% CI 1.04–1.29; p = 0.011).ConclusionsOur study indicated preoperative plasma PAI-1 expression as an independent risk factor for DVT in patients who underwent THA.

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Background To report the clinical outcomes of a longitudinal patellar tunnel technique in reconstruction of the medial patellofemoral ligament(MPFL) with anterior half of the peroneus longus tendon autograft treatment of recurrent patellar dislocation.Methods From May 2010 to January 2019, we performed MPFL reconstruction with anterior half of the peroneus longus tendon autograft by using a longitudinal patellar tunnel technique on 48 knees in 45 patients(26 female, 19 male) with the median age was 24 (17 ~ 44) years old with recurrent patellar dislocation. We made one 4. 5 mm channel from the medial upper edge of the patella to the surface (medial half) of the patella so that to introduce autograft into the medial femoral channel. The autograft was fixed with absorbable screws with the knee bent at 30°. CT and X-rays were used to assess the correction of the tibia tuberosity- trochlear groove (TT-TG) distance, patellar tilt angle, Caton-Deschamps index, femoral anteversion angle, tibial extorsion angle, and the presence or absence of knee valgus. Subjective scores, such as Kujala score and Lysholm score, were used to evaluate knee function preoperatively and postoperatively.Results No recurrence of patellar dislocation occurred in these patients during an average of 25 ± 7.6 months (range, 6 to 54 months) of follow-up. Preoperative TT-TG distance, patellar tilt angles, and Caton-Deschamps index was (18.9 ± 5.7)mm(10.2mm ~ 32.4 mm),31.5°±13.7° (20.3°~58.4°),1.1 ± 0.2 (1.0 ~ 1.5), respectively, which were corrected by (10.8 ± 4.3) mm (4.5 mm ~ 17.1 mm), 10.7°±2.6° (5.6°~15.3°), and 1.07 ± 0.06 (1.02 ~ 1.15) postoperatively(P < 0.05). 28 knees were treated with lateral release + MPFL reconstruction; 11 knees were treated with lateral release + tibial tubercle ingression + MPFL reconstruction; 9 knees were treated with lateral release + tibial tubercle ingression and depression + MPFL reconstruction. At the last follow-up, Lysholm score was (89.7 ± 2.3), which significantly improved (P < 0.05) compared with the pre-operational score of (54.4 ± 5.9); Kujala score was (91.5 ± 4.4) points, which significantly improved (P < 0.05) compared with the pre-operational score of (60.6 ± 5.8).Conclusion One patellar tunnels in reconstruction of the medial patellofemoral ligament (MPFL) with anterior half of the peroneus longus tendon autograft is a safe, effective, and economic method for recurrent patellar dislocation.