Three-dimensional kinematic analysis of upper limb movements between individuals with and without subacromial shoulder pain exploring the statistical parametric mapping

Individualized Versus General Exercise Therapy in People with Subacromial Pain Syndrome: A Randomized Controlled Trial

OBJECTIVE

To evaluate the effect of individualized exercises based on movement fault (MF) control on pain intensity and disability in subjects with chronic subacromial pain syndrome (SAPS).

DESIGN

Randomized Controlled Trial (IRCT20221126056621N1) SETTING: Rehabilitation clinics PARTICIPANTS: Thirty-eight participants with chronic SAPS (aged 52.23(8.47), 60 %woman).

INTERVENTIONS

The participants were randomly allocated to one of the intervention groups (individualized exercises based on MFs control test designed to target specific movement faults) or the control group (commonly prescribed general scapular stabilization exercises). Both groups received exercise sessions twice a week for four weeks.

MAIN OUTCOME MEASURES

The primary outcome measures were pain intensity at rest (PR) and during arm raising (PAR) using a visual analog scale. Disability was assessed as a key secondary outcome, including the disabilities of the arm, shoulder, and hand (DASH) questionnaire and the Shoulder Pain and Disability Index (SPADI).

RESULTS

Following completion of all exercise sessions, PAR was significantly lower in the intervention group compared to the control group (mean [CI]: 9.17 [0.31 to 18.03], p=0.04), with a large effect size [0.68]. The reduction of PAR remained significantly lower in the intervention group than in the control group after four months of follow-up (mean [CI]: 18.29 [9.09 to 27.48], p=0.00) with a large effect size [1.27]. Disability significantly decreased at two month (mean=14.58, p=0.002 on SPADI index; mean=10.26, p=0.006 on DASH index) and four month (mean=19.85, p=0.00 on SPADI index; mean=12.09, p=0.001 on DASH index) follow ups in the intervention group compared to the control group.

CONCLUSION

Individualized exercises based on MFs control of the shoulder region was accompanied by decreased PAR and disability in subjects with SAPS.

Less Pain, but no changes in maximal inclination angles during an overhead reach task following local anesthetic in patients with ongoing shoulder pain

This multicenter observational study aimed to assess how pain reduction, induced by local anesthesia, affects the relative angular contributions of the shoulder girdle and trunk to the maximal angular performance during a semi-constrained overhead reach task in patients with ongoing shoulder pain. Twenty-nine individuals (age 59.0 SD 12.8 years;16-male) with symptomatic shoulders were administered corticosteroid and lidocaine injections by their attending orthopedic surgeon. Immediately before and after the injections, participants reached for a target on the ceiling ten times as high as possible while their pain levels, shoulder, and trunk movements were recorded. The analysis revealed that there was a significant reduction in pain following the injections. However, there were no significant differences in maximum shoulder and trunk inclination angles between the pre- and post-injection conditions. Notably, there were slight but statistically significant alterations in humeroscapular kinematics during the initial phase of arm elevation following the injections. In conclusion, acute pain relief following local anesthetics is not associated with immediate alterations in maximum shoulder girdle and trunk inclination angles during a semi-constrained overhead reach task in patients with ongoing shoulder pain. However, there are signs of small alterations in humeroscapular kinematics during the initial phase of arm elevation.

Three-Dimensional Kinematics during Shoulder Scaption in Asymptomatic and Symptomatic Subjects by Inertial Sensors: A Cross-Sectional Study

Shoulder kinematics is a measure of interest in the clinical setting for diagnosis, evaluating treatment, and quantifying possible changes. The aim was to compare shoulder scaption kinematics between symptomatic and asymptomatic subjects by inertial sensors. Methods: Scaption kinematics of 27 subjects with shoulder symptomatology and 16 asymptomatic subjects were evaluated using four inertial sensors placed on the humerus, scapula, forearm, and sternum. Mobility, velocity, and acceleration were obtained from each sensor and the vector norm was calculated from the three spatial axis (x,y,Z). Shoulder function was measured by Upper Limb Functional Index and Disabilities of the Arm, Shoulder, and Hand questionnaires. One way ANOVA was calculated to test differences between the two groups. Effect size was calculated by Cohen’s d with 95% coefficient Intervals. Pearson’s correlation analysis was performed between the vector norms humerus and scapula kinematics against DASH and ULFI results in symptomatic subjects. Results: The asymptomatic group showed higher kinematic values, especially in the humerus and forearm. Symptomatic subjects showed significantly lower values of mobility for scapular protraction-retraction (Cohen’s d 2.654 (1.819–3.489) and anteriorisation-posteriorisation (Cohen’s d 1.195 (0.527–1.863). Values were also lower in symptomatic subjects for velocity in all scapular planes of motion. Negative correlation showed that subjects with higher scores in ULFI or DASH had lower kinematics values. Conclusion: Asymptomatic subjects tend to present greater kinematics in terms of mobility, velocity, and linear acceleration of the upper limb, and lower humerus and scapula kinematics in symptomatic subjects is associated with lower levels of function.