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Adolfsson L. What keeps a shoulder stable - Is there an ideal method for anterior stabilisation? Shoulder Elbow 2024; 16:4-7. [PMID: 38435031 PMCID: PMC10902409 DOI: 10.1177/17585732231224699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Accepted: 12/17/2023] [Indexed: 03/05/2024]
Abstract
The gleno-humeral joint is by far the most mobile in the human body but also afflicted by dislocations, predominantly anterior. Surgical stabilisation is often successful but failures not uncommon. The following review describes potential causes of failure and highlights the need of adapting surgical methods to pathomorphology.
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Affiliation(s)
- Lars Adolfsson
- Department of Orthopedics, Linköping and Örebro Universities, Linkoping, Sweden
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2
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Maas H, Noort W. Knee movements cause changes in the firing behaviour of muscle spindles located within the mono-articular ankle extensor soleus in the rat. Exp Physiol 2024; 109:125-134. [PMID: 36827200 PMCID: PMC10988709 DOI: 10.1113/ep090764] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 02/06/2023] [Indexed: 02/25/2023]
Abstract
We recently showed that within an intact muscle compartment, changing the length of one muscle affects the firing behaviour of muscle spindles located within a neighbouring muscle. The conditions tested, however, involved muscle lengths and relative positions that were beyond physiological ranges. The aim of the present study was to investigate the effects of simulated knee movements on the firing behaviour of muscle spindles located within rat soleus (SO) muscle. Firing from single muscle spindle afferents in SO was measured intra-axonally for different lengths (static) and during lengthening (dynamic) of the lateral gastrocnemius and plantaris muscles. Also, the location of the spindle within the muscle was assessed. Changing the length of synergistic ankle plantar flexors (simulating different static knee positions, between 45 and 130°) affected the force threshold, but not the length threshold, of SO muscle spindles. The effects on type II afferents were substantially (four times) higher than those on type IA afferents. Triangular stretch-shortening of synergistic muscles (simulating dynamic knee joint rotations of 15°) caused sudden changes in the firing rate of SO type IA and II afferents. Lengthening decreased and shortening increased the firing rate, independent of spindle location. This supports our prediction that the major point of application of forces exerted by connections between adjacent muscles is at the distal end of SO. We conclude that muscle spindles provide the CNS with information about the condition of adjacent joints that the muscle does not span.
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Affiliation(s)
- Huub Maas
- Department of Human Movement Sciences, Faculty of Behavioural and Movement SciencesVrije Universiteit AmsterdamAmsterdamThe Netherlands
- Amsterdam Movement SciencesAmsterdamThe Netherlands
| | - Wendy Noort
- Department of Human Movement Sciences, Faculty of Behavioural and Movement SciencesVrije Universiteit AmsterdamAmsterdamThe Netherlands
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Wang AB, Housley SN, Ludvig D, Franz CK, Flores AM, Cope TC, Perreault EJ. Cancer survivors post-chemotherapy exhibit unimpaired short-latency stretch reflexes in the proximal upper extremity. J Neurophysiol 2023; 130:895-909. [PMID: 37671425 PMCID: PMC10649846 DOI: 10.1152/jn.00299.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 08/28/2023] [Accepted: 08/28/2023] [Indexed: 09/07/2023] Open
Abstract
Oxaliplatin (OX) chemotherapy can lead to long-term sensorimotor impairments in cancer survivors. The impairments are often thought to be caused by OX-induced progressive degeneration of sensory afferents known as length-dependent dying-back sensory neuropathy. However, recent preclinical work has identified functional defects in the encoding of muscle proprioceptors and in motoneuron firing. These functional defects in the proprioceptive sensorimotor circuitry could readily impair muscle stretch reflexes, a fundamental building block of motor coordination. Given that muscle proprioceptors are distributed throughout skeletal muscle, defects in stretch reflexes could be widespread, including in the proximal region where dying-back sensory neuropathy is less prominent. All previous investigations on chemotherapy-related reflex changes focused on distal joints, leading to results that could be influenced by dying-back sensory neuropathy rather than more specific changes to sensorimotor circuitry. Our study extends this earlier work by quantifying stretch reflexes in the shoulder muscles in 16 cancer survivors and 16 healthy controls. Conduction studies of the sensory nerves in hand were completed to detect distal sensory neuropathy. We found no significant differences in the short-latency stretch reflexes (amplitude and latency) of the shoulder muscles between cancer survivors and healthy controls, contrasting with the expected differences based on the preclinical work. Our results may be linked to differences between the human and preclinical testing paradigms including, among many possibilities, differences in the tested limb or species. Determining the source of these differences will be important for developing a complete picture of how OX chemotherapy contributes to long-term sensorimotor impairments.NEW & NOTEWORTHY Our results showed that cancer survivors after oxaliplatin (OX) treatment exhibited stretch reflexes that were comparable with age-matched healthy individuals in the proximal upper limb. The lack of OX effect might be linked to differences between the clinical and preclinical testing paradigms. These findings refine our expectations derived from the preclinical study and guide future assessments of OX effects that may have been insensitive to our measurement techniques.
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Affiliation(s)
- Allison B Wang
- Department of Biomedical Engineering, Northwestern University, Evanston, Illinois, United States
- Department of Physical Therapy and Human Movement Sciences, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States
- Shirley Ryan AbilityLab, Chicago, Illinois, United States
| | - Stephen N Housley
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, Georgia, United States
| | - Daniel Ludvig
- Department of Biomedical Engineering, Northwestern University, Evanston, Illinois, United States
- Shirley Ryan AbilityLab, Chicago, Illinois, United States
| | - Colin K Franz
- Shirley Ryan AbilityLab, Chicago, Illinois, United States
- Department of Physical Medicine and Rehabilitation, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States
- The Ken & Ruth Davee Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States
| | - Ann Marie Flores
- Department of Physical Therapy and Human Movement Sciences, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States
- Department of Medical Social Sciences, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States
- Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois, United States
| | - Timothy C Cope
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, Georgia, United States
- W.H. Coulter Department of Biomedical Engineering, Emory University and Georgia Institute of Technology, Georgia Institute of Technology, Atlanta, Georgia, United States
- Integrated Cancer Research Center, Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia, United States
| | - Eric J Perreault
- Department of Biomedical Engineering, Northwestern University, Evanston, Illinois, United States
- Shirley Ryan AbilityLab, Chicago, Illinois, United States
- Department of Physical Medicine and Rehabilitation, Northwestern University Feinberg School of Medicine, Chicago, Illinois, United States
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Lulic-Kuryllo T, Leonardis JM, Momoh AO, Lipps DB. Assessing shoulder muscle stretch reflexes following breast cancer treatment and postmastectomy breast reconstruction. J Neurophysiol 2023; 129:914-926. [PMID: 36947887 PMCID: PMC10110716 DOI: 10.1152/jn.00081.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 03/13/2023] [Accepted: 03/16/2023] [Indexed: 03/24/2023] Open
Abstract
Muscle stiffness is altered following postmastectomy breast reconstruction and breast cancer treatment. The exact mechanisms underlying these alterations are unknown; however, muscle stretch reflexes may play a role. This work examined short- (SLR) and long-latency (LLR) shoulder muscle stretch reflexes in breast cancer survivors. Forty-nine patients who had undergone postmastectomy breast reconstruction, 17 who had undergone chemoradiation, and 18 healthy, age-matched controls were enrolled. Muscle activity was recorded from the clavicular and sternocostal regions of the pectoralis major and anterior, middle, and posterior deltoids during vertical ab/adduction or horizontal flex/extension perturbations while participants maintained minimal torques. SLR and LLR were quantified for each muscle. Our major finding was that following postmastectomy breast reconstruction, SLR and LLR are impaired in the clavicular region of the pectoralis major. Individuals who had chemoradiation had impaired stretch reflexes in the clavicular and sternocostal region of the pectoralis major, anterior, middle, and posterior deltoid. These findings indicate that breast cancer treatments alter the regulation of shoulder muscle stretch reflexes and may be associated with surgical or nonsurgical damage to the pectoral fascia, muscle spindles, and/or sensory Ia afferents.NEW & NOTEWORTHY Shoulder muscle stretch reflexes may be impacted following postmastectomy breast reconstruction and chemoradiation. Here, we examined short- and long-latency shoulder muscle stretch reflexes in two experiments following common breast reconstruction procedures and chemoradiation. We show impairments in pectoralis major stretch reflexes following postmastectomy breast reconstruction and pectoralis major and deltoid muscle stretch reflexes following chemoradiation. These findings indicate that breast cancer treatments alter the regulation of shoulder muscle stretch reflexes.
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Affiliation(s)
- Tea Lulic-Kuryllo
- School of Kinesiology, University of Michigan, Ann Arbor, Michigan, United States
| | - Joshua M Leonardis
- College of Applied Health Sciences, University of Illinois, Urbana-Champaign, Illinois, United States
| | - Adeyiza O Momoh
- Section of Plastic Surgery, University of Michigan, Ann Arbor, Michigan, United States
| | - David B Lipps
- School of Kinesiology, University of Michigan, Ann Arbor, Michigan, United States
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, United States
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Torell F, Franklin S, Franklin DW, Dimitriou M. Assistive Loading Promotes Goal-Directed Tuning of Stretch Reflex Gains. eNeuro 2023; 10:ENEURO.0438-22.2023. [PMID: 36781230 PMCID: PMC9972504 DOI: 10.1523/eneuro.0438-22.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 01/24/2023] [Accepted: 01/30/2023] [Indexed: 02/15/2023] Open
Abstract
Voluntary movements are prepared before they are executed. Preparatory activity has been observed across the CNS and recently documented in first-order neurons of the human PNS (i.e., in muscle spindles). Changes seen in sensory organs suggest that independent modulation of stretch reflex gains may represent an important component of movement preparation. The aim of the current study was to further investigate the preparatory modulation of short-latency stretch reflex responses (SLRs) and long-latency stretch reflex responses (LLRs) of the dominant upper limb of human subjects. Specifically, we investigated how different target parameters (target distance and direction) affect the preparatory tuning of stretch reflex gains in the context of goal-directed reaching, and whether any such tuning depends on preparation duration and the direction of background loads. We found that target distance produced only small variations in reflex gains. In contrast, both SLR and LLR gains were strongly modulated as a function of target direction, in a manner that facilitated the upcoming voluntary movement. This goal-directed tuning of SLR and LLR gains was present or enhanced when the preparatory delay was sufficiently long (>250 ms) and the homonymous muscle was unloaded [i.e., when a background load was first applied in the direction of homonymous muscle action (assistive loading)]. The results extend further support for a relatively slow-evolving process in reach preparation that functions to modulate reflexive muscle stiffness, likely via the independent control of fusimotor neurons. Such control can augment voluntary goal-directed movement and is triggered or enhanced when the homonymous muscle is unloaded.
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Affiliation(s)
- Frida Torell
- Physiology Section, Department of Integrative Medical Biology, Umeå University, S-901 87 Umeå, Sweden
| | - Sae Franklin
- Neuromuscular Diagnostics, Department of Sport and Health Sciences, Technical University of Munich, D-80992 Munich, Germany
| | - David W Franklin
- Neuromuscular Diagnostics, Department of Sport and Health Sciences, Technical University of Munich, D-80992 Munich, Germany
- Munich Institute of Robotics and Machine Intelligence (MIRMI), Technical University of Munich, D-80992 Munich, Germany
- Munich Data Science Institute (MDSI), Technical University of Munich, 85748 Munich, Germany
| | - Michael Dimitriou
- Physiology Section, Department of Integrative Medical Biology, Umeå University, S-901 87 Umeå, Sweden
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