Browsing by Author "Lamberts, R. P."

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    Circular frames of the humerus : salvage surgery case series
    (South African Orthopaedic Association, 2019-11) Pretorius, H. S.; Strauss, K.; Ferreira, N.; Lamberts, R. P.
    INTRODUCTION: High energy fractures like gunshot-related injuries or high velocity road traffic accidents are often complex to treat and have been associated with a higher non-union rate, especially when there is extensive bone loss. Fractures with severe comminution may not heal due to bone loss and an inability to achieve adequate fracture stability. Treatment of fractures that are not amenable to plating or nailing may lead to non-unions, septic or aseptic, that need repeat surgeries. Stabilisation with external fixation is a reliable option to maintain stability and provide a suitable environment for union. MATERIALS AND METHODS: This retrospective study used medical records of all patients with complex mid-shaft humerus fractures, as well as their complications, that were treated with hexapod circular external fixation between January 2009 and September 2015. All the patients in this case series presented with severe humerus fractures or complications thereof which were not amenable to conventional therapy. RESULTS: Union was achieved in ten out of the 12 cases (83.3%). Union was achieved without bone graft or any other interventions at the fracture site except implant removal where indicated. The median time in external fixation was 196 days (interquartile range: 112-228). The most common complication encountered in this series was pin-site infection. Fixation points were noted to be infected in 33% of cases at some time during the treatment period. CONCLUSION: This study suggests that humeral non-unions and complex humerus fractures that are not amenable to conventional fixation methods, such as intramedullary nails and plates, can successfully achieve union when treated with a hexapod circular external fixator. Level of evidence: Level 4
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    Relationship between perceived exertion during exercise and subsequent recovery measurements
    (Termedia Publishing, 2017) Mann, T. N.; Lamberts, R. P.; Nummela, A.; Lambert, M. I.
    The return towards resting homeostasis in the post-exercise period has the potential to represent the internal training load of the preceding exercise bout. However, the relative potential of metabolic and autonomic recovery measurements in this role has not previously been established. Therefore the aim of this study was to investigate which of 4 recovery measurements was most closely associated with Borg’s Rating of Perceived Exertion (RPE), a measurement widely acknowledged as an integrated measurement of the homeostatic stress of an exercise bout. A heterogeneous group of trained and untrained participants (n = 36) completed a bout of exercise on the treadmill (3 km at 70% of maximal oxygen uptake) followed by 1 hour of controlled recovery. Expired respiratory gases and heart rate (HR) were measured throughout the exercise and recovery phases of the trial with recovery measurements used to calculate the magnitude of excess post-exercise oxygen consumption (EPOCMAG), the time constant of the EPOC curve (EPOCτ), 1 min heart rate recovery (HRR60s) and the time constant of the HR recovery curve (HRRτ) for each participant. RPE taken in the last minute of exercise was significantly associated with HRR60s (r=-0.69), EPOCτ (r=0.52) and HRRτ (r=0.43) but not with EPOCMAG. This finding suggests that, of the 4 recovery measurements under investigation, HRR60s shows modest potential to represent inter-individual variation in the homeostatic stress of a standardized exercise bout, in a group with a range of fitness levels.
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    Submuscular bridge plating of length-unstable paediatric femoral shaft fractures in children between the ages of 6 and 13
    (Stellenbosch : Stellenbosch University, 2014-12) Salkinder, Rael; Du Toit, J.; Lamberts, R. P.; Stellenbosch University. Faculty of Medicine and Health Sciences. Dept. of Surgical Sciences. Orthopaedic Surgery
    No abstract available