Impact of neck dissection on scapular muscle function: a case-controlled electromyographic study

Effects of Conscious Control of Scapular Orientation in Oral Cancer Survivors With Scapular Dyskinesis: A Randomized Controlled Trial

OBJECTIVES

Spinal accessory nerve dysfunction is one of the complications of neck dissection in patients with oral cancer. This study aimed to explore the effects of long-term scapular-focused exercises and conscious control of scapular orientation on scapular movement and quality of life (QoL).

METHODS

This study was a randomized controlled trial with concealed allocation, assessor blinding, and intention-to-treat analysis. Thirty-six patients with oral cancer were randomly allocated to the motor-control group (scapular-focused exercise + conscious control of scapular orientation) or the regular-exercise group (scapular-focused exercises only). Both groups received conventional physical therapy after neck dissection for 3 months. Shoulder pain intensity, active range of motion (AROM) of shoulder abduction, scapular muscle strength and activity under maximal voluntary isometric contraction (MVIC), scapular muscle activity when performing scapular movements, and QoL were measured at baseline, 1 month after the start of the intervention, and the end of the intervention.

RESULTS

Both groups showed significant improvement in all outcomes except shoulder pain intensity. After the 3-month intervention, the motor-control group had more significant improvement in AROM of shoulder abduction with a 19° difference (95% CI: 10-29, P < .001), muscle strength of upper trapezius with an 11 N difference (95% CI: 2-20; P = .021), and QoL than the regular-exercise group. When performing shoulder horizontal adduction and flexion, the relative value (%MVIC) of serratus anterior was smaller in the motor-control group with a 106%MVIC difference (95% CI: 7-205, P = .037).

CONCLUSIONS

Scapular-focused exercises have promising effects on spinal accessory nerve dysfunction. Combining scapular-focused exercises with conscious control of scapular orientation has more remarkable benefits on AROM of shoulder abduction, UT muscle strength, and muscle activation pattern than the scapular-focused exercises alone. Conscious control of scapular orientation should be considered to integrate into scapular-focused exercises in patients with oral cancer and scapular dyskinesis.Trial registry name and URL, and registration number: ClinicalTrials.gov (URL: https://clinicaltrials.gov; Approval No: NCT03545100).

Motor control integrated into muscle strengthening exercises has more effects on scapular muscle activities and joint range of motion before initiation of radiotherapy in oral cancer survivors with neck dissection: A randomized controlled trial

Background

Accessory nerve shoulder dysfunction is common after neck dissection in oral cancer survivors. This study aimed to investigate the short-term effects of scapular muscle strengthening exercises with motor-control techniques on neck dissection-related shoulder dysfunction in oral cancer survivors before the initiation of radiotherapy.

Methods

Thirty-eight participants were randomly allocated into the motor-control and regular-exercise groups. Each group received conventional physical therapy and specific scapular muscle strengthening exercises for 1 month immediately after neck dissection. Motor control techniques were integrated with scapular strengthening exercises for the motor-control group. Shoulder pain, active range of motion (AROM) of shoulder abduction, and scapular muscle activities including upper trapezius (UT), middle trapezius (MT), lower trapezius (LT), and serratus anterior (SA) when performing maximal voluntary isometric contraction (MVIC) and scapular muscle exercises were evaluated at baseline and after 1 month of training.

Results

Both groups reduced shoulder pain and increased muscle activity of maximum voluntary isometric contraction (MVIC) of each muscle after the intervention. Increased AROM of shoulder abduction was only observed in the motor-control group (95% CI 3.80 to 20.51, p = 0.004). Relative to baseline evaluation, muscle activities of UT decreased in the motor-control group when performing shoulder shrug with 1-kg weight (95% CI -33.06 to -1.29, p = 0.034). Moreover, the SA activity decreased in the motor-control group (95% CI -29.73 to -27.68, p<0.001) but increased in the regular-exercise group (95% CI 28.16 to 30.05, p<0.001) when performing shoulder horizontal adduction and flexion.

Conclusion

Early strengthening exercise with motor control techniques has greater benefits for improving AROM of shoulder abduction, muscle economy, and reducing compensatory scapular muscle activities in patients with neck dissection-related shoulder dysfunction before the initiation of radiotherapy.

Improving screening for physical impairments and access to early physiotherapy after neck dissection surgery: a translational controlled trial

PURPOSE

Lack of routine screening for a range of physical impairments that can result after neck dissection (ND) may hinder physiotherapy referral and treatment. The purpose of this study was to implement an intervention that targeted both physiotherapists and surgeons to increase their post-operative physical screening of ND patients and in turn improve physiotherapy referral rates.

METHODS

The authors undertook a translational controlled pilot study, conducted over a 12-month period that utilised three tertiary hospital sites. The target groups were physiotherapists at one intervention site and surgeons at the other intervention site, with the third hospital acting as a control site and receiving usual care. The intervention included a physiotherapy brochure and a clinical pathway for screening, to promote early identification and prompt referral of patients with a physical impairment. The primary outcome variables were screening and referral rates between sites at the study end-point.

RESULTS

Logistic regression analyses were conducted on n = 174 to assess differences in screening and referral rates between sites. Patients at the intervention site that targeted physiotherapists had four times the odds of being screened for shoulder dysfunction compared to the control site (p = 0.0002), and three times the odds of being referred to physiotherapy (0.0039). There were no statistically significant differences in the odds of patients being screened for shoulder dysfunction or referred to physiotherapy at the intervention site that targeted surgeons.

CONCLUSION

The translational intervention undertaken by physiotherapists resulted in significantly greater screening and referral rates of post-operative ND patients for physiotherapy.

Do patients benefit from physiotherapy for shoulder dysfunction following neck dissection? A systematic review

OBJECTIVE

Accessory nerve palsy affects a proportion of patients following neck dissection, and results in shoulder dysfunction and regional pain. This project aimed to establish the evidence supporting post-operative physiotherapy for the shoulder following neck dissection.

METHOD

A systematic review was conducted of prospective trials investigating the efficacy of rehabilitation for shoulder or upper limb dysfunction and pain following any type of neck dissection.

RESULTS

A total of 820 papers were identified; through a staged review process, 7 trials were found that fulfilled the inclusion criteria. These included three randomised, controlled trials and four non-randomised studies. Five out of the seven trials demonstrated a statistically significant benefit of physiotherapy.

CONCLUSION

Current evidence shows a benefit from physiotherapy in patients with shoulder dysfunction following neck dissection. Some evidence suggests progressive resistance is superior to other types of physiotherapy. Long-term benefit and cost efficacy have not been studied.

Positive association between the cross-sectional area of the rhomboid muscle, and the range of shoulder abduction after neck dissection surgery

OBJECTIVE

To evaluate the association between the cross-sectional area of selected shoulder and scapular muscles and the range of shoulder abduction, early after neck dissection surgery.

PATIENTS AND METHODS

Twenty-seven patients (contributing 34 upper limbs), who had undergone neck dissection surgery for head and neck malignancy, were enrolled into the study. Loss of strength of the trapezius muscle at 1-month post-surgery was quantified by the change in active range of shoulder abduction (%A-ROM), measured by hand-held goniometry in a standing position, from baseline, before surgery. The cross-sectional area of the following muscles were measured on unenhanced computed tomography images after surgery: trapezius, rhomboid, serratus anterior, pectoralis major, deltoid, and biceps brachii.

RESULTS

There was a significant positive correlation between the %A-ROM and the cross-sectional area of the rhomboid muscle.

CONCLUSION

Greater active shoulder abduction early after surgery is associated with a greater cross-sectional area of the rhomboid muscle. This muscle should be included in intensive programs for rehabilitation of upper limb movement after neck dissection surgery.

Functional outcomes and quality of life after a 6-month early intervention program for oral cancer survivors: a single-arm clinical trial

Background

Advanced treatment of oral cancer increases survival rates; however, it also increases the risk of developing shoulder dysfunction, dysphagia, oral dysfunction, donor site morbidity and psychological issues. This single-arm preliminary pilot study aims to explore the effects of a six-month early intervention program following reconstructive surgery in oral cancer survivors.

Methods

A total of 65 participants were analyzed following reconstructive surgery. Outcome measurements were taken during the first visit, and at one, three and six months after reconstructive surgery.

Results

Scapular muscle strength and shoulder range of motion progressively improved during the 6-month follow-up. The mean Disability of the Arms, Shoulder and Hand (DASH) score showed significant improvement at 1 month (p < .001). Health related QoL showed significant differences between baseline and 6-months post-surgery scores on global health and on most of the function and symptom scales. The predicted return-to-work rate was 80% at one year after the operation. Return-to-work rate differs in different vocational types, with a higher rate of return in the skilled or semi-skilled (87.5%) and self-employed (86.7%).

Conclusions

We suggest that early integrated intervention program with a follow-up of at least six months following reconstructive surgery may help develop and identify intervention guidelines and goals in the initial six months of treatment following neck dissection in oral cancer survivors.

Alterations in 18F-FDG accumulation into neck-related muscles after neck dissection for patients with oral cancers

BACKGROUND

18F-fluoro-2-deoxy-D-glucose (18F-FDG) accumulations are commonly seen in the neck-related muscles of the surgical and non-surgical sides after surgery with neck dissection (ND) for oral cancers, which leads to radiologists having difficulty in diagnosing the lesions. To examine the alterations in 18F-FDG accumulation in neck-related muscles of patients after ND for oral cancer.

MATERIAL AND METHODS

18F-FDG accumulations on positron emission tomography (PET)-computed tomography (CT) in neck-related muscles were retrospectively analyzed after surgical dissection of cervical lymph nodes in oral cancers.

RESULTS

According to the extent of ND of cervical lymph nodes, the rate of patients with 18F-FDG-PET-positive areas increased in the trapezius, sternocleidomastoid, and posterior neck muscles of the surgical and/or non-surgical sides. In addition, SUVmax of 18F-FDG-PET-positive areas in the trapezius and sternocleidomastoid muscles were increased according to the extent of the ND.

CONCLUSIONS

In evaluating 18F-FDG accumulations after ND for oral cancers, we should pay attention to the 18F-FDG distributions in neck-related muscles including the non-surgical side as false-positive findings.

Effect of scapular dyskinesis on supraspinatus repair healing in a rat model

BACKGROUND

Rotator cuff tears are common conditions that often require surgical repair to improve function and to relieve pain. Unfortunately, repair failure remains a common problem after rotator cuff repair surgery. Several factors may contribute to repair failure, including age, tear size, and time from injury. However, the mechanical mechanisms resulting in repair failure are not well understood, making clinical management difficult. Specifically, altered scapular motion (termed scapular dyskinesis) may be one important and modifiable factor contributing to the risk of repair failure. Therefore, the objective of this study was to determine the effect of scapular dyskinesis on supraspinatus tendon healing after repair.

METHODS

A rat model of scapular dyskinesis was used. Seventy adult male Sprague-Dawley rats (400-450 g) were randomized into 2 groups: nerve transection of the accessory and long thoracic nerves (SD) or sham nerve transection (Sham control). After this procedure, all rats underwent unilateral detachment and repair of the supraspinatus tendon. All rats were sacrificed at 2, 4, and 8 weeks after surgery. Shoulder function, passive joint mechanics, and tendon properties (mechanical, histologic, organizational, and compositional) were evaluated.

RESULTS

Scapular dyskinesis alters joint function and may lead to compromised supraspinatus tendon properties. Specifically, diminished mechanical properties, altered histology, and decreased tendon organization were observed for some parameters.

CONCLUSION

This study identifies scapular dyskinesis as one underlying mechanism leading to compromise of supraspinatus healing after repair. Identifying modifiable factors that lead to compromised tendon healing will help improve clinical outcomes after repair.

Intra-operative monitoring of the spinal accessory nerve: a systematic review

Objective:

To investigate evidence that intra-operative nerve monitoring of the spinal accessory nerve affects the prevalence of post-operative shoulder morbidity and predicts functional outcome.

Methods:

A search of the Medline, Scopus and Cochrane databases from 1995 to October 2012 was undertaken, using the search terms ‘monitoring, intra-operative’ and ‘accessory nerve’. Articles were included if they pertained to intra-operative accessory nerve monitoring undertaken during neck dissection surgery and included a functional shoulder outcome measure. Further relevant articles were obtained by screening the reference lists of retrieved articles.

Results:

Only three articles met the inclusion criteria of the review. Two of these included studies suggesting that intra-operative nerve monitoring shows greater specificity than sensitivity in predicting post-operative shoulder dysfunction. Only one study, with a small sample size, assessed intra-operative nerve monitoring in neck dissection patients.

Conclusion:

It is unclear whether intra-operative nerve monitoring is a useful tool for reducing the prevalence of accessory nerve injury and predicting post-operative functional shoulder outcome in patients undergoing neck dissection. Larger, randomised studies are required to determine whether such monitoring is a valuable surgical adjunct.