OHOla-Lars Hammer

Ola-Lars Hammer

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Previous Organizations / Institutes

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Ola-Lars Hammer has a total of 17 co-authors. Here are the top co-authors by number of shared publications:


Latest Publications

  • Open Access

    Corrigendum: Complex Regional Pain Syndrome Following Distal Radius Fracture: Does Surgical Method Matter?

    by Trine Ludvigsen, Ola-Lars Hammer, Jonas Meling Fevang, Kjell Matre, Eva Hansen Dybvig, Per-Henrik Randsborg

    In the above article published in the Journal of Wrist Surgery on September 4, 2024 (DOI: 10.1055/s-0044-1788323), the author's affiliations were incorrectly listed in the online version. The correct affiliations appear as above. Article published online: 10 December 2024 © 2024. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/) Thieme Medical Publishers, Inc. 333 Seventh Avenue, 18th Floor, New York, NY 10001, USA

  • Open Access

    Complex Regional Pain Syndrome Following Distal Radius Fracture: Does Surgical Method Matter?

    by Trine Ludvigsen, Ola-Lars Hammer, Jonas Meling Fevang, Kjell Matre, Eva Hansen Dybvig, Per-Henrik Randsborg

    The purpose of this study was to compare the risk of complex regional pain syndrome (CRPS) following surgical treatment of distal radius fractures (DRFs) with either a volar locking plate (VLP) or an external fixator (EF). Data from two randomized controlled trials (RCTs) were merged and analyzed. A logistic regression analysis was conducted to identify independent risk factors for the occurrence of CRPS. A total of 322 patients were included from the two RCTs; 159 patients were operated upon with VLP and 163 patients with EF. CRPS was diagnosed in 6 patients treated with VLP (4%) and in 16 patients receiving EF (11%), overall 22 cases of CRPS (7%). None of the other independent risk factors had a significant influence on the risk for CRPS (all p > 0.05). Patients treated with an EF had a higher risk of developing CRPS compared to those treated with a VLP. We found no other independent variable predicting CRPS. III.


  • Open Access

    Can Generic Outcome Questionnaires Replace QuickDASH in Monitoring Clinical Outcome Following Surgical Treatment of Distal Radius Fractures?

    by Ola-Lars Hammer, Rune Bruhn Jakobsen, Jurate Šaltytė Benth, Per-Henrik Randsborg


  • Cost-Effectiveness of Volar Locking Plate Compared with Augmented External Fixation for Displaced Intra-Articular Wrist Fractures

    by Ola-Lars Hammer, Rune Bruhn Jakobsen, Stale Clementsen, Hendrik Fuglesang, Gudrun Waaler Bjornelv, Per-Henrik Randsborg

    Background: The purpose of the present study was to estimate the cost-effectiveness of treating displaced, intra-articular distal radial fractures with volar locking plate fixation compared with augmented external fixation. Methods: A cost-utility analysis was conducted alongside a randomized, clinical trial comparing 2 surgical interventions for intra-articular distal radial fractures. One hundred and sixty-six patients were allocated to either volar locking plate fixation (84 patients) or external fixation (82 patients) and were followed for 2 years. Health-related quality of life was assessed with the EuroQol-5 Dimensions and was used to calculate patients’ quality-adjusted life-years (QALYs). Resource use was identified prospectively at the patient level at all follow-up intervals. Costs were estimated with use of both a health-care perspective and a societal perspective. Results were expressed in incremental cost-effectiveness ratios, and uncertainty was assessed with use of bootstrapping methods. Results: The average QALY value was equivalent between the groups (1.70463 for the volar locking plate group and 1.70726 for the external fixation group, yielding a nonsignificant difference of −0.00263 QALY). Health-care costs were equal between the groups, with a nonsignificant difference of €52 (p = 0.8) in favor of external fixation. However, the external fixation group had a higher loss of productivity due to absence from work (5.5 weeks in the volar locking plate group compared with 9.2 weeks for the external fixation group; p = 0.02). Consequently, the societal costs were higher for the external fixation group compared with the volar locking plate group (€18,037 compared with €12,567, representing a difference of €5,470; p = 0.04) in favor of the volar locking plate group. Uncertainty analyses showed that there is indifference regarding which method to recommend from a health-care perspective, with volar locking plate treatment and external fixation having a 47% and 53% likelihood of being cost-effective, respectively. From the societal perspective, volar locking plate treatment had a 90% likelihood of being cost-effective. Conclusions: External fixation was less cost-effective than volar locking plate treatment for distal radial fractures from a societal perspective, primarily because patients managed with external fixation had a longer absence from work. Level of Evidence: Economic and Decision Analysis Level I. See Instructions for Authors for a complete description of levels of evidence.


  • Volar Locking Plates Versus Augmented External Fixation of Intra-Articular Distal Radial Fractures

    by Ola-Lars Hammer, Ståle Clementsen, Joakim Hast, Jūratė Šaltytė Benth, Jan Erik Madsen, Per-Henrik Randsborg

    Background: The aim of the study was to compare the functional outcomes following fixation with a volar locking plate (VLP) with those outcomes after augmented external fixation (EF) of displaced, intra-articular distal radial fractures in patients 18 to 70 years of age. Methods: Following inclusion, randomization, and surgery, clinical examination and outcome assessments were conducted at 6 weeks, 12 weeks, 6 months, 1 year, and 2 years. The primary outcome was the Quick Disabilities of the Arm, Shoulder and Hand (QuickDASH) score, and secondary outcomes included wrist range of motion, grip strength, and pain assessed with a visual analog scale (VAS). Results: Over a span of 3 years, 166 patients were included in the study. The mean age was 55.0 years (standard deviation [SD] = 11.5 years), with the ages distributed evenly in each treatment group by block randomization (84 patients in the VLP group and 82 in the EF group). The patients in the VLP group had a significantly better mean QuickDASH score, range of motion, and grip strength at 6 weeks, 12 weeks, 6 months, and 1 year. There were no significant differences between the groups at 2 years. On the basis of the minimal clinically important difference, the difference in the QuickDASH score was clinically relevant only at 6 weeks and arguably at 3 months (9.2 and 8.5 points, respectively). Therefore, the statistically significant improvement in the functional outcome of VLP compared with that of EF cannot be safely said to have clinical relevance beyond 12 weeks. The overall complication rate was comparable between the 2 groups. The rate of follow-up at 2 years was 97.0%. Conclusions: VLP fixation resulted in faster recovery of function compared with EF, but no functional advantage was demonstrated at 2 years. Level of Evidence: Therapeutic Level I. See Instructions for Authors for a complete description of levels of evidence.


  • Open Access

    Early Mobilization and Physiotherapy Vs. Late Mobilization and Home Exercises After ORIF of Distal Radial Fractures

    by Ståle Ørstavik Clementsen, Ola-Lars Hammer, Jūratė Šaltytė Benth, Rune Bruhn Jakobsen, Per-Henrik Randsborg

    Background: Volar locking plates have permitted early mobilization, omitting the need for prolonged cast immobilization, after distal radial fractures (DRFs). However, the type of rehabilitation following plate fixation of DRFs remains an unresolved issue. The purpose of this study was to evaluate the effect of physiotherapy after volar plate fixation of DRFs. At a 2-year follow-up, we compared the results of immediate physiotherapy (early mobilization) with those of home exercises following 2 weeks in a dorsal plaster splint (late mobilization). Methods: Patients with an extra-articular DRF scheduled for open reduction and internal fixation (ORIF) with a volar locking plate were evaluated for eligibility for enrollment in the study. The patients were randomized into 2 groups: (1) early mobilization and physiotherapy and (1) late mobilization and home exercise. In the early mobilization group, the plaster splint was removed after 2 to 3 days. During the first 3 months, the patients met with the institution’s physiotherapist every other week. The late mobilization group wore the dorsal splint for 2 weeks and only met with our physiotherapist once, when the splint was removed. This group was provided with a home physiotherapy program and instructed to perform home exercises on their own. Results: One hundred and nineteen patients were included in the study. The 2 groups had similar demographics with respect to age, sex, and baseline values. Seven patients were lost to follow-up. No clinically relevant difference in scores on the shortened version of the Disabilities of the Arm, Shoulder and Hand (QuickDASH) questionnaire was found between the 2 groups at any of the follow-up evaluations. The largest difference in the QuickDASH score was found at 6 weeks, when the early mobilization group had a mean score of 30 compared with a mean of 37 in the late mobilization group (p = 0.05). Conclusions: Early mobilization and multiple physiotherapy visits did not improve wrist function compared with standard treatment of 2 weeks in a dorsal plaster splint, a single physiotherapy visit, and home exercises. Early mobilization following ORIF of an extra-articular DRF is safe. Level of Evidence: Therapeutic Level I. See Instructions for Authors for a complete description of levels of evidence.


  • Open Access

    Five-Year Follow-up Results of a Randomized Controlled Study Comparing Intramedullary Nailing with Plate Fixation of Completely Displaced Midshaft Fractures of the Clavicle in Adults

    by Hendrik F.S. Fuglesang, Gunnar B. Flugsrud, Per-Henrik Randsborg, Ola-Lars Hammer, Stein Erik Utvåg

    Background: Surgical management of completely displaced midshaft fractures of the clavicle is becoming more frequent, although long-term follow-up with Level-I evidence is scarce. Plate fixation (PF) of comminuted fractures provides faster functional recovery than elastic stable intramedullary nailing (ESIN). The 12-month follow-up of this randomized controlled trial, published previously, found no clinical differences at that time on the group level, but subtle differences on the subgroup level indicated that the results after closed ESIN were better than those after open ESIN. The primary aim of the study reported here was to compare the long-term clinical outcomes and sequelae after open reduction with those after closed reduction and to help surgeons develop a treatment strategy of either PF or ESIN for selected patients. Methods: At a median follow-up of 66 months (range, 49 to 89 months), the 123 patients in the original study were invited to an online secure survey. We used the survey results to compare the PF and ESIN treatment arms and to perform predetermined subgroup analyses of closed compared with open ESIN in relation to Disabilities of the Arm, Shoulder and Hand (DASH) score, pain assessment, and implant removal. Results: The questionnaire was completed by 114 (93%) of the 123 patients. There were no differences between the 2 treatment arms with regard to the DASH score (ESIN, 3.1 ± 7.0 and PF, 3.7 ± 7.5; p = 0.9). The 27 patients who had been treated with closed ESIN had a significantly superior DASH score compared with the 27 patients who had been treated with open ESIN (closed, 0.7 ± 1.4 and open, 5.2 ± 8.9; p = 0.015) and compared with the patients who had been treated with PF (closed ESIN, 0.7 ± 1.4 and PF, 3.9 ± 7.5; p = 0.002). Patients who had been treated with closed ESIN also reported fewer sequelae than patients who had been treated with open ESIN or PF. Conclusions: The results of this study, combined with those of our prior 1-year follow-up of the same patients, indicate that it seems to be advantageous to perform closed ESIN. The long-term results after PF were similar to those after open ESIN, but PF resulted in faster functional recovery and fewer patients needing to have the implant removed. Therefore, if open reduction is necessary for a comminuted fracture, it seems that the advantages of the minimally invasive ESIN procedure are lost, and the surgeon should consider conversion to PF. Level of Evidence: Therapeutic Level I. See Instructions for Authors for a complete description of levels of evidence.