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182 ATYPICAL CAUSES OF LEG ULCERATION
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CHAPTER
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4
Musculoskeletal Factors
inLeg Ulcers
Assessment andManagement
RONA FRANCES CAMPBELL
here is a growing recognition that sub- optimal movement,
T
reduced mobility and impaired biomechanical function have an impact on the development and longevity of lower limb complica­tions that relate to chronic venous disease (CVD), venous leg ulcers (VLUs) and lymphoedema (Araujo et al. 2016; Farrelly 2018; Meulendijks etal.2020a,2020b).
Enhancing patient movement and addressing musculoskeletal (MSK) and biomechanical concerns is key in optimising compression therapy during an episode of ulceration. Optimal movement and mobility also helps to mitigate complications like peripheral oedema and impaired joint mobility (Wounds2016).
Optimal physical function reects adequate motor control, phys­ical tness and the ability to mobilise freely on a regular basis (Lang­hammer et al.2018). Inactivity or immobility, whether because of pain, injury, systemic disease, neuropathy, non­disease or the ageing process, can lead to sub- optimal movement and changes in physical and biomechanical function that can increase venous hypertension (Langhammer etal.2018).
neurological MSK
Lower Limb and Leg Ulcer Assessment and Management, First Edition. Edited by Aby Mitchell, Georgina Ritchie, and Alison Hopkins. © 2024 John Wiley & Sons Ltd. Published 2024 by John Wiley & Sons Ltd.
188
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Musculoskeletal Factors in Leg Ulcers 189
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People with CVD and VLUs are known to present with biome­chanical issues, for example impairment in ankle joint movement or gait dysfunction (Figure 4.1) (Back et al. 1995; Clarke-
Moloney etal. 2007; Araujo et al.2016). These issues can result in adverse changes in important physiological processes that ensure lower limb health and venous return, namely the veno- muscular pumps (VMPs) (Uhl and Gillot2015; NICE2021). The VMPs are important anatomi­cal pumps in the lower limb, and they help mediate haemodynamic homeostasis within the circulatory system and aid venous return when activated through regular MSK movement (Uhl and Gil­lot2015). An important VMP in the lower limb is the calf muscle pump (CMP). Failure and dysfunction of this pump through a reduc­tion in ankle joint range of motion (ROM) and adverse changes in gait are major contributory factors in the development and chronicity of CVD and VLUs (Lattimer etal.2017).
This chapter will examine the factors that inuence mobility, lower limb biomechanical function and the inuence of sub- optimal gait, with a focus on the lower limb VMPs and ankle joint ROM.
Ambulatory
Venous Hypertension
Abnormal Muscle
Pump Function
Neuropathy
Decreased Mobility,
Range of Motion
FIGURE 4.1 Biomechanical factors that inuence venous leg ulceration.
Source: Shiman etal.2009/John Wiley & Sons. Reproduced with permission.
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Gait
Abnormalities
Pain
Venous Leg
Ulceration
190 MUSCULOSKELETAL FACTORS IN LEG ULCERS
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Understanding how these biomechanical factors aect the manage­ment of patients with CVD and VLUs is vital. These factors relating to mobility impairment are known to have a negative inuence on the onset and progress of CVD, VLUs and wound healing (Padberg etal.2004). Moreover, a loss in mobility is known to have an impact on quality of life (QoL) (Meulendijks etal.2020b).
RISK FACTORS
There are known non- modiable established risk factors in patients who have CVD and VLUs, such as age, sex and family history (NICE2021). However, there is a sub- section of modiable risk fac­tors that relate to mobility and the biomechanical function (refer to risk factors in Chapter5) for those who have CVD and VLUs which are poorly understood, and these relate to sub- optimal mobility and biomechanical and gait dysfunction.
During holistic lower limb assessment, screening for risk factors that relate to an individual’s mobility and biomechanical function in conjunction with those relating to VLUs is important for optimal clinical outcomes, as poor mobility can have an impact on many areas within wound care management (O’Brien et al.2014; Smith etal.2018). However, screening for mobility risk factors for patients who have VLUs may be perceived as challenging for a nurse when evidence suggests that delivering essential care can in some cases be dicult in a busy clinical setting (Guest etal. 2018). Moreover, biomechanical and mobility factors are not always recognised as important risk factors for the development and chronicity of VLUs within wound care management (Farrelly2018).
A poorly recognised mobility risk factor for the development and chronicity of VLUs is CMP dysfunction. The CMP is in the lower, posterior leg and is one of the important VMPs in the lower limb and foot. The VMPs are responsible for 90% of the venous return from the lower limb to the trunk (Williams et al. 2014). The CMP is responsible for approximately 65% of the net venous blood return within the lower limb, which is enabled through adequate move­ment at the ankle (Williams etal.2014).
CMP dysfunction is not only a risk factor for VLUs, but also for deep vein thrombosis (DVT), and is an independent predictor of
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all- cause mortality (Araki etal.1994; Back etal.1995; Milic etal.2009; Halkar et al. 2020). Therefore, recognition of CMP dysfunction is important not only within the context of VLU management, but in relation to the overall health of the patient.
A major biomechanical risk factor inuencing CMP dysfunction is the loss of ankle joint ROM (Back etal.1995; de Souza etal.2022). Research suggests that when ankle joint ROM is reduced there is an increased risk of developing an ulceration (Table 4.1) (Araki etal.1994). Once an ulcer has developed, the episode of wound heal­ing can be prolonged compared to people with adequate ROM when using compression bandaging (Barwell etal.2000). When movement at the ankle is impaired, there is a reduction in the functional
TABLE 4.1 
avenous leg ulcer.
Risk factor Explanation
Immobility Increased risk of venous hypertension
Limited ankle range of
motion (ROM)
Sedentary lifestyle Obesity
History of leg frac-
ture or trauma
Lower limb dysfunction/
structural deformities
Underlying
musculoskeletal disease
Biomechanical risk factors that may contribute todeveloping
and oedema Reduction in joint ROM Sarcopenia Obesity Calf muscle pump (CMP) dysfunction Impact on gait Fixed joint position
Gait impairment Impact on CMP function Impaired gait Damage to the venous and lymphatic anatomy Impaired joint ROM Leg length discrepancy Pelvic obliquity Genu valgum/recuvartum Highly pronated or supinated foot postures Diseases that cause issues with balance and
proprioception Diseases that result in structural deformities Diseases that result in gait dysfunction
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