ANALYSIS OF RANGE OF MOTION IN FEMALE RECREATIONAL TENNIS PLAYERS WITH AND WITHOUT LATERAL ELBOW TENDINOPATHY

Background:Intrinsic factors including altered joint motion in the upper extremity may lead to altered biomechanics in tennis players and could result in symptoms of lateral elbow tendinopathy.Purpose:To compare upper extremity passive motion and elbow carrying angle between three groups of women: recreational tennis players with LET, non-symptomatic recreational tennis players, and a control group of non-tennis players.Study Design:Cross-sectional.Methods:A convenience sample of 63 women was recruited and placed into one of the three groups: non-symptomatic tennis players (NSTP), symptomatic tennis players (STP), and a control group. Elbow carrying angle, passive range of motion of the shoulder, elbow, forearm, and wrist were measured during a single session.Results:A significant difference was found between the groups for wrist flexion (p < 0.00), forearm pronation (p = 0.002), elbow flexion (p = 0.020) and extension (p = 0.460), as well as shoulder internal rotation (p < 0.00). No significant differences were found in other motions or carrying angle between the three groups (p =0.059). Post-hoc comparisons indicated that shoulder internal rotation and wrist flexion was less in both STP and NSTP groups compared with the control group. Elbow flexion and forearm pronation were greater in STP than the other two groups.Conclusion:Impairments including loss of shoulder internal rotation and wrist flexion and greater motion at the elbow and forearm were found in the UE of symptomatic tennis players. Evaluation of passive motion and muscle length should be performed prior to establishing a rehabilitation plan for symptomatic tennis players.Levels of Evidence:3     

Upper extremity strength and range of motion and their relationship to function in breast cancer survivors

The impact upper extremity impairments (UE) have on UE function in breast cancer survivors (BCS) is unclear. The purpose of this study was to evaluate the associations between upper extremity active range of motion (AROM), passive range of motion (PROM), and strength with self-reported function in BCS. BCS (n = 24) completed the Disabilities of Arm, Shoulder and Hand (DASH) and the Pennsylvania Shoulder Score (PSS). AROM and PROM of shoulder flexion, extension, external rotation (ER) at 0° and 90° of abduction, and internal rotation (IR) at 90° of abduction were measured using a digital inclinometer. Strength was measured using a hand-held dynamometer for scapular abduction and upward rotation, scapular depression and adduction, flexion, IR, ER, scaption, and horizontal adduction. All constructs of AROM, PROM, and strength were correlated with the DASH and PSS. DASH was moderately to highly correlated with 2 of 5 AROM, 2 of 5 PROM, and 6 of 7 shoulder strength measures. PSS was moderately to highly correlated with 2 of 5 AROM, 2 of 5 PROM, and 4 of 7 shoulder strength measures. Regression analysis showed that AROM explained 40% of the DASH scores and strength explained 20% of scores on the PSS. This study characterizes the impact that shoulder motion, flexibility, and strength losses have on shoulder function in BCS. Deficits in AROM and shoulder strength explained the greatest proportion of shoulder disability. Future clinical trials should consider incorporating AROM and strengthening techniques to improve shoulder use after breast cancer treatments.     

Normal functional range of motion of upper limb joints during performance of three feeding activities

This study was designed to quantify the range of upper limb joint motion required during the performance of a specific type of functional activity. Ten able-bodied men were studied as they performed three feeding tasks--eating with a spoon, eating with a fork, and drinking from a handled cup. Three shoulder joint rotations, one elbow joint rotation, one forearm joint rotation, and three wrist joint rotations were quantified simultaneously using a three-dimensional measurement system. It was found that the required ranges of motion for the feeding tasks were 5 degrees to 45 degrees shoulder flexion, 5 degrees to 35 degrees shoulder abduction, 5 degrees to 25 degrees shoulder internal rotation, 70 degrees to 130 degrees elbow flexion, from 40 degrees forearm pronation to 60 degrees forearm supination, from 10 degrees wrist flexion to 25 degrees wrist extension, and from 20 degrees wrist ulnar deviation to 5 degrees wrist radial deviation. Wrist rotation was also measured, but it was found to be negligible.     

Effects of a wrapping technique on passive range of motion in a spastic upper extremity

Limited range of motion (ROM) and subsequent soft tissue contractures resulting from spasticity are common developments in patients with acquired hemiplegia from cerebrovascular accidents. The purpose of this study was to examine the effects of a wrapping technique on ROM in patients with a spastic upper extremity. Four adult patients, postcerebrovascular accident of less than one year, received wrapping of the upper extremity for three hours, three times a week on alternating days for a total of two to four weeks. Baseline passive range-of-motion (PROM) measurements were established for shoulder flexion, shoulder abduction, shoulder external rotation, and wrist extension; these movements were commonly limited in all patients. The PROM was recorded after each wrapping session. The results showed a significant change in PROM for all motions in all patients (p = less than .01). In addition, all patients reported a decrease in pain in the upper extremity. Comparisons of videotapes of two patients at baseline and after 12 wrappings revealed an increase in ROM and a decrease in spasticity in the upper extremity during ambulation. These findings should encourage clinicians to experiment further with the wrapping technique and to report their findings.     

Range of Motion in Older Women

This study had three purposes: to compare the active neck and upper extremity range of motion (ROM) in healthy older women with expected estimates; to consider if right and left side measures were similar; and to determine the degree of ROM loss with advancing age. Sixty-one older women, living independently in the community, were measured at the neck, shoulder, elbow, forearm, and wrist on the right and left sides using a standard protocol. ROM was less than expected by 14_ to 30_ for neck lateral flexion (26.00_ ?8.72_ on right; 26.41_ ?7.67_ on left), shoulder abduction (154.62_D 21.37_ on right; 150.25_ ?21.65_ on left), shoulder flexion (158.23_ ?19.55_ on right; 159.20_ ?8.73_ on left), shoulder internal rotation (52.92_ ?8.99_ on right; 53.74_ ?9.94_ on left), and shoulder external rotation (76.05_ ?16.31_ on right; 72.44_ ?15.37 on left). Some differences were noted between right and left side ROM. Linear regression for age and range suggested that range decreased with age by an average of approximately 1_ per year in right shoulder abduction, right shoulder flexion, and right and left shoulder external rotation.     

Shoulder Kinematics of Axillary Web Syndrome in Women Treated for Breast Cancer

ObjectiveTo better understand how the shoulder moves in breast cancer survivors with axillary web syndrome (AWS), we compared 3-dimensional (3D) shoulder kinematics during shoulder elevation among breast cancer survivors with and without AWS 5 years postoperatively. Although research consistently shows decreased shoulder range of motion with AWS, we do not understand the underlying biomechanics.DesignNested case control study.SettingUniversity Academic Breast Center.ParticipantsTwenty-five women who had surgery 5 years previously for unilateral breast cancer with the removal of at least 1 lymph node participated in this study (N=25). Twelve participants had AWS; 13 women did not have AWS.InterventionsNot applicable.Main Outcome MeasuresThree-dimensional shoulder kinematic data during shoulder forward flexion, scapular plane abduction, and coronal plane abduction were collected using 3D electromagnetic motion tracking. Kinematic data were extracted at 30°, 60°, 90°, and 120° of arm elevation for scapular upward rotation, internal rotation, and posterior tilt as well as for glenohumeral external rotation.ResultsWomen with AWS demonstrated 15.2° less scapular upward rotation at 120° humerothoracic elevation (95% confidence interval [-25.2, -5.2], P=.005), regardless of plane. No significant between-group differences were found for any other angle of scapular upward rotation, nor for scapular internal rotation, scapular posterior tilt, or glenohumeral axial rotation at any angle.ConclusionsFive years after surgery for breast cancer, women diagnosed with AWS have altered scapulohumeral kinematics that may place them at an increased risk of shoulder pain based on existing kinematic literature in healthy cohorts. This information can help guide rehabilitation programs for breast cancer survivors to facilitate pain-free upper extremity function after treatment.     

Ranges of active joint motion for the shoulder,elbow, and wrist in healthy adults

Purpose: The aim of this study was to show highly reliable normal values and three-dimensional characteristics for final range of motion during active movements of the upper extremity joints, and to develop a database from healthy participants, with the advantage of this database lying in the methods of defining shoulder axial rotation angle and of compensating for soft tissue artifacts. Methods: We used an electromagnetic tracking system (FASTRAK) to measure three-dimensional motions of the shoulder (thoracohumeral), elbow/forearm, and wrist in 20 healthy adults (age range: 18–34 years) during active joint motion tasks of the upper extremity. Results: Joint angles of the upper extremity at the final position of joint motion tasks were determined. Highly reliable data for shoulder axial rotation angle were obtained, using a new definition of joint angle and regression analysis to compensate for estimation errors. Conclusions: These results should be useful in setting goals for the treatment of upper extremity joint functions in the fields of rehabilitation, orthopedics, and sports medicine.

Implications for Rehabilitation

• Complex joint motions that occur naturally (unconsciously) about some axes should be taken into account in interventions for range of joint motion (ROM).

• The data obtained through this study simultaneously indicating multiple interrelated angles can be used as reference values for maximum active ROM.

• ROM in the directions of motion involved in the various tasks (for example, elevation angle during shoulder flexion) may have a role to play in evaluating and setting goals for patients with impaired ROM of the arm joints.

     

Comparison of specific and non-specific treatment approaches for individuals with posterior capsule tightness and shoulder impingement symptoms: A randomized controlled trial

BackgroundPosterior capsule tightness (PCT) is associated with shoulder pain and altered shoulder kinematics, range of motion (ROM), external rotation (ER) strength, and pain sensitization.ObjectiveTo assess the effects of two interventions on shoulder kinematics, Shoulder Pain and Disability Index (SPADI) scores, ROM, strength, and pressure pain threshold (PPT) in individuals with PCT and shoulder impingement symptoms.MethodsIn this prospectively registered randomized controlled trial 59 individuals were randomized to either an Experimental Intervention Group (EIG, n=31) or a Control Intervention Group (CIG, n=28). The low flexion (LF) test was used to determine the presence of PCT. Shoulder kinematics, SPADI scores, internal rotation (IR) and ER ROM, ER strength, and PPT were measured pre- and post-treatment. Those in the EIG received an intervention specific to pain and PCT and those in the CIG received a non-specific intervention, both 4 weeks in duration.ResultsIndividuals in the EIG demonstrated more scapular upward rotation (P=.03; mean difference (MD)=3.3°; 95% Confidence Interval (CI)=1.3°, 4.9°) and improved value on the LF test (P=.02; MD=4.6°; 95%CI=0.7°, 8.6°) than those in the CIG after treatment. Both groups presented less anterior (P<.01; MD=-0.7mm; 95%CI=-1.3mm, -0.2mm) and superior (P<.01; MD=-0.5mm; 95%CI=-0.9mm, -0.2mm) humeral translations, decreased SPADI score (P<.01; MD=-23.6; 95%CI=-28.7, -18.4), increased IR ROM (P<.01; MD=4.6°; 95%CI=1.8°, 7.8°) and PPTs for upper trapezius (P<.01; MD=60.1kPa; 95%CI=29.3kPa, 90.9kPa), infraspinatus (P=.04; MD=47.3kPa; 95%CI=2.1kPa, 92.5kPa), supraspinatus (P<.01; MD=63.7kPa; 95%CI=29.6kPa, 97.9kPa), and deltoid (P<.01; MD=40.9kPa; 95%CI=12.3kPa, 69.4kPa) after treatment.ConclusionThe experimental intervention was more effective at improving PCT as measured through changes in the LF test. No benefit of the specific approach over the non-specific intervention was noted for the remaining variables.     

Restoration of shoulder movement in quadriplegic and hemiplegic patients by functional electrical stimulation using percutaneous multiple electrodes.

The purpose of this study is to restore the motion of the paralyzed shoulder caused by upper motor neuron disorders using functional electrical stimulation (FES). Percutaneous wire electrodes were implanted into twelve muscles of the shoulder in six patients with stroke or cervical spinal cord injury. The motion of the paralyzed shoulder was controlled by a portable FES computer system, with the three standard stimulation patterns for restoring motion of 90 degrees flexion to 90 degrees horizontal abduction, 90 degrees flexion to 20 degrees horizontal adduction, and 90 degrees abduction to 90 degrees horizontal adduction. Shoulder movements were repeatedly controlled according to the created stimulation patterns in five of the patients. The two dimensional motion analyzer also confirmed shoulder control over a satisfactorily broad range of excursion. One hemiplegic patient, who was a signboard painter, had his paretic left upper extremity improved by FES, and he drew a large picture on a board with his normal right hand and, with his affected left arm against the wall, to support his trunk. This may be a world first case of producing shoulder motion through FES.     

A Comparison of 3-D Shoulder Kinematics to Perform ADLs Between Older and Younger Adults

ABSTRACT

The primary purpose of this study was to compare the 3-D kinematics of older and younger adults during activities of daily living. Twenty-five older and 27 younger asymptomatic participants were evaluated. The MotionMonitor was used to collect humerus, scapula, and trunk kinematic data. Multivariate analyses of variance (MANOVA) were used to analyze kinematic differences. Significant differences between groups were found. In several comparisons, the older participants had significantly less shoulder joint complex motion than the younger participants. For feeding, the older participants had 16.3° less glenohumeral external rotation, 5.0° less scapular upward rotation, and 8.6° less scapular internal rotation. For reaching an overhead shelf, the older group had 8.1° less glenohumeral flexion, 11.8° less external rotation and 16.0° less scapular internal rotation. For hair combing, the older participants had 13.3° less glenohumeral external rotation, and 6.6° less scapular internal rotation. For washing the contralateral axilla, the older group had 7.7° less scapular internal rotation. In several other comparisons, the older group had significantly more shoulder complex motion than the younger participants. For hair combing, the older group had 14.6° more glenohumeral flexion. For washing the contralateral axilla, the older group demonstrated 7.8° more glenohumeral flexion and 13.0° more glenohumeral internal rotation. Overall, older and younger participants demonstrated significantly different shoulder joint complex kinematics. Age specific values should be considered when interacting with a patient presenting with shoulder dysfunction.     

Inclinometer Reliability for Shoulder Ranges of Motion in Individuals With Subacromial Impingement Syndrome

ObjectiveThis study aimed to determine the intra- and interrater reliability of active and passive range of motion in the shoulders of individuals with subacromial impingement syndrome using a digital inclinometer.MethodsThe raters evaluated active and passive range of motion in the shoulder of 50 individuals with unilateral subacromial impingement syndrome in movements including flexion, abduction, extension, external rotation in a neutral position, external rotation with the arm at 90° of abduction, and internal rotation with the arm at 90° of abduction. The tests were performed by 2 examiners on the same day, with a 10-minute interval, and were repeated by 1 examiner after a 2- to 4-day interval. Reliability was analyzed using the intraclass correlation coefficient (ICC_2,3).ResultsThere was moderate to excellent interrater (ICC_2,3 = 0.50-0.95) and intrarater (ICC_2,3 = 0.74-0.94) reliability. In the interrater analysis, the standard error of measurement (SEM) ranged from 4.1° to 10°, the percentage SEM (%SEM) ranged from 2% to 17%, and the minimum detectable change ranged from 9.5° to 23.4°. In the intrarater analysis, the SEM ranged from 4° to 9.2°, %SEM ranged from 3% to 14%, and the minimum detectable change ranged from 9.3° to 21.4°.ConclusionThe digital inclinometer showed moderate to excellent reliability for measuring active and passive range of motion in shoulders with unilateral subacromial impingement syndrome.     

Long-handled sponges: to bend or not to bend

The purpose of this study was to compare upper extremity range of motion when using a straight-handled long-handled sponge versus a bent-handled long-handled sponge. Thirty-eight participants ranging in age from 20 to 55 years were randomly assigned to one of two order groups: straight-bent or bent-straight. The task involved touching a buzzer placed over thoracic vertebrae 6 and 7 with the long-handled sponge. The dependent variable was right upper extremity range of motion. Significant range of motion differences were found in wrist flexion-extension, elbow flexion-extension, and shoulder abduction-adduction between the straight-handled and the bent-handled long-handled sponge (p < .05). No significant differences were found with ulnar and radial deviation of the wrist, wrist supination-pronation, or shoulder flexion (p > .05). These results suggest that within a normal population, the bent handle may be more beneficial to individuals who have decreased range of motion in shoulder abduction-adduction and wrist flexion-extension, whereas the straight handle may be more accommodating to those with decreased range of motion in the elbow. Implications for therapeutic evaluation include ensuring proper evaluation of range of motion of all upper extremity joints in order to provide assistive devices that serve individual needs. Future research should include special populations with upper extremity orthopedic conditions as well as different degrees of handle bending with the long-handled sponge.     

Long-Handled Sponges: To Bend or Not To Bend

The purpose of this study was to compare upper extremity range of motion when using a straight-handled long-handled sponge versus a bent-handled long-handled sponge. Thirty-eight participants ranging in age from 20 to 55 years were randomly assigned to one of two order groups: straight-bent or bent-straight. The task involved touching a buzzer placed over thoracic vertebrae 6 and 7 with the long-handled sponge. The dependent variable was right upper extremity range of motion. Significant range of motion differences were found in wrist flexion-extension, elbow flexion-extension, and shoulder abduction-adduction between the straight-handled and the bent-handled long-handled sponge (p < .05). No significant differences were found with ulnar and radial deviation of the wrist, wrist supination-pronation, or shoulder flexion (p > .05). These results suggest that within a normal population, the bent handle may be more beneficial to individuals who have decreased range of motion in shoulder abduction-adduction and wrist flexion-extension, whereas the straight handle may be more accommodating to those with decreased range of motion in the elbow. Implications for therapeutic evaluation include ensuring proper evaluation of range of motion of all upper extremity joints in order to provide assistive devices that serve individual needs. Future research should include special populations with upper extremity orthopedic conditions as well as different degrees of handle bending with the long-handled sponge.     

Kinematics of shoulder,trunk, pelvis,and hip while reaching forward to progressively distant targets

IntroductionInformation on the normal contribution of various body regions to forward reaching provides a basis for assessing the maneuver. The purpose of this study was to describe the kinematics of the shoulder, trunk, pelvis, and hip of healthy young males while they stood and reached toward a target at arm's length and 5%, 10%, 15%, and 20% of body height beyond.MethodTwelve healthy adult males were marked with 22 spherical reflective markers. Two trials of unilateral forward reaching were performed towards a target placed at five target distances. Motion was captured via reflective markers and an infrared camera system.ResultsSagittal and transverse plane motions demonstrated high reliability between trials at each target distance (ICC = 0.716 trunk flexion to 0.977 shoulder flexion). Shoulder flexion and horizontal abduction were major contributors to forward reaching with components of trunk flexion and left trunk rotation at all target distances. Hip flexion, pelvic tilt, left pelvis rotation, and hip external rotation made notable contributions at the furthest targets. All motions became more pronounced as target distance increased (P ≤ .001).ConclusionKinematic analysis demonstrated that right forward reaching requires composite movements at the shoulder, trunk, pelvis, and hip. The contribution of each body region to forward reaching became more pronounced as the target became more distant. These findings may be helpful when identifying localized movement impairments contributing to limited forward reach in a clinical population, although clinical validation is needed.     

关节镜下三点定位技术修补肩袖损伤的临床体会

目的 总结关节镜下三点定位技术修补肩袖损伤的临床体会.方法 收集2018年1月-2019年6月符合纳入标准的肩袖损伤患者52例,根据手术方法不同分为两组.A组采用传统两点定位技术(n=26),B组采用三点定位技术(n=26),比较两组患者手术时间、视觉模拟评分法(VAS)、美国加州大学(UCLA)肩关节评分、美国肩肘外...     

Throwing kinematics and elbow varus torque relative to ball size in junior baseball players

[Purpose] The purpose of this study was to investigate changes in the shoulder and elbow joint angles, upper limb angular velocities, and elbow varus torque when throwing balls of two different sizes. [Participants and Methods] The pitching motion of 26 junior baseball players was analyzed using an optical motion capture system. The balls used were a standard baseball and a small ball of equal weight. Shoulder external rotation/abduction and elbow flexion were measured. The maximum values of shoulder joint internal rotation, elbow joint extension, wrist flexion angular velocity, and elbow joint varus torque were also evaluated. The ball velocity was determined as an index of pitching performance. [Results] The shoulder external rotation and elbow flexion angles were higher when pitching with a small ball. The joint angular velocity was also significantly higher when pitching with a small ball for all items examined. The ball speed was significantly higher with the small ball. The maximum varus torque of the elbow joint divided by the ball velocity was significantly lower for the small ball. [Conclusion] For a junior baseball player with a small hand length, using a small ball enables pitching with low stress on the elbow joint.     

Arthrographic and clinical findings in patients with hemiplegic shoulder pain

OBJECTIVES: To identify the etiology of hemiplegic shoulder pain by arthrographic and clinical examinations and to determine the correlation between arthrographic measurements and clinical findings in patients with hemiplegic shoulder pain. DESIGN: Case series. SETTING: Medical center of a 1582-bed teaching institution in Taiwan. PARTICIPANTS: Thirty-two consecutive patients with hemiplegic shoulder pain within a 1-year period after first stroke were recruited. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Clinical examinations included Brunnstrom stage, muscle spasticity distribution, presence or absence of subluxation and shoulder-hand syndrome, and passive range of motion (PROM) of the shoulder joint. Arthrographic measurements included shoulder joint volume and capsular morphology. RESULTS: Most patients had onset of hemiplegic shoulder pain less than 2 months after stroke. Adhesive capsulitis was the main cause of shoulder pain, with 50% of patients having adhesive capsulitis, 44% having shoulder subluxation, 22% having rotator cuff tears, and 16% having shoulder-hand syndrome. Patients with adhesive capsulitis showed significant restriction of passive shoulder external rotation and abduction and a higher incidence of shoulder-hand syndrome (P=.017). Those with irregular capsular margins had significantly longer shoulder pain duration and more restricted passive shoulder flexion (P=.017) and abduction (P=.020). Patients with shoulder subluxation had significantly larger PROM (flexion, P=.007; external rotation, P<.001; abduction, P=.001; internal rotation, P=.027), lower muscle tone (P=.001), and lower Brunnstrom stages of the proximal upper extremity (P=.025) and of the distal upper extremity (P=.001). Muscle spasticity of the upper extremity was slightly negatively correlated with shoulder PROM. Shoulder joint volume was moderately positively correlated with shoulder PROM. CONCLUSIONS: After investigating the hemiplegic shoulder joint through clinical and arthrographic examinations, we found that the causes of hemiplegic shoulder pain are complicated. Adhesive capsulitis was the leading cause of shoulder pain, followed by shoulder subluxation. Greater PROM of the shoulder joint, associated with larger joint volume, decreased the occurrence of adhesive capsulitis. Proper physical therapy and cautious handling of stroke patients to preserve shoulder mobility and function during early rehabilitation are important for a good outcome.     

Intraexaminer Reliability of Hand-Held Dynamometry in the Upper Extremity: A Systematic Review

ObjectiveTo summarize and appraise the literature on the intraexaminer reliability of hand-held dynamometry (HHD) in the upper extremity.Data SourcesMEDLINE, CINAHL, and EMBASE were searched for relevant studies published up to December 2011. In addition, experts were contacted, and journals and reference lists were hand searched.Study SelectionTo be included in the review, articles needed to (1) use a repeated-measures, within-examiner(s) design; (2) include symptomatic or asymptomatic individuals, or both; (3) use HHD to measure muscle strength in any of the joints of the shoulder, elbow, or wrist with the “make” or the “break” technique; (4) report measurements in kilogram, pound, or torque; (5) use a device that is placed between the examiner's hand and the subject's body; and (6) present estimates of intraexaminer reliability.Data ExtractionQuality assessment and data extraction were performed by 2 reviewers independently.Data SynthesisFifty-four studies were included, of which 26 (48%) demonstrated acceptable intraexaminer reliability. Seven high-quality studies showed acceptable reliability for flexion and extension of the elbow in healthy subjects. Conflicting results were found for shoulder external rotation and abduction. Reliability for all other movements was unacceptable. Higher estimates were reached for within-sessions reliability and if means of trials were used.ConclusionsIntraexaminer reliability of HHD in upper extremity muscle strength was acceptable only for elbow measurements in healthy subjects. We provide specific recommendations for future research. Physical therapists should not rely on HHD measurements for evaluation of treatment effects in patients with upper extremity disorders.     

Visual estimation of shoulder posture: accuracy and reliability across five planes of motion

Background: Visual estimation is still widely used by physiotherapists in clinical practice. The accuracy and reliability of visual estimation are under question and vary with the joint being evaluated. The utility of using visual estimation to evaluate shoulder angular posture is inconclusive and has yet to be evaluated across a comprehensive range of planes and postures.

Objective: The purpose of this observational, cross-sectional study was to determine whether visual estimation is an accurate and reliable procedure for determining shoulder angular postures in a range of shoulder motions.

Methods: Sixty-three physical therapy students viewed digital photographs of an asymptomatic volunteer to visually estimate degrees of arm abduction, flexion, extension, internal rotation, and external rotation. Six photographs from each plane of movement were shown, at positions spanning the available range of motion, and participants were asked to estimate the angular posture. Estimates were averaged, and errors from computer measurements were calculated. Differences between estimates and measurements were determined with t-tests.

Results: The overall accuracy of the visual estimates is considered poor to fair. Root mean square errors were reasonable, from 5° to 17°, but the 95% spread of the data reached a maximum of 53°. Estimates were most accurate at the abduction and flexion postures closest to 90°. Most estimates for extension were underestimated, while more internal rotation estimates were overestimated. Reliability ranged from poor to fair (0.12–0.63).

Conclusions: Using visual estimation to evaluate shoulder planar postures results in a wide range of error. Physiotherapy students should be encouraged to use more objective measurement methods.     

Quantitative in vivo studies of median nerve sliding in response to wrist, elbow, shoulder and neck movements

Objective. To examine median nerve sliding in response to upper limb movements in vivo. To determine whether the median nerve can be unloaded.

Design. Exploratory study in healthy subjects.

Background. Impaired sliding may lead to neuropathic symptoms. In vivo results for neural dynamics in normal subjects are essential to understand changes in upper limb disorders.

Methods. Ultrasound imaging of the median nerve during 40° wrist extension, 80° shoulder abduction, 90° elbow extension, and 35° contralateral neck side flexion. Frame by frame cross-correlation of image sequences to measure nerve sliding and strain.

Results. Nerve excursion in the forearm and upper arm ranged from 0.3 mm for neck side flexion to 10.4 mm for elbow extension. Additional strain in the forearm for wrist extension was 1.1% (SEM, 0.2%), for shoulder abduction 1.0% (SEM, 0.2%), and for neck side flexion 0.1% (SEM, 0.1%). With the limb flexed, sliding was delayed and sometimes the nerve or the nerve fascicles had a wavy appearance.

Conclusion. The median nerve is unloaded when the shoulder is adducted or elbow flexed. When the arm is extended (90° shoulder abduction, 60° wrist extension, and elbow straight) the total additional strain in the forearm will be 2.5–3.0%. Even in this position the strain is likely to be below levels that impair blood flow or conduction. Therefore, the median nerve appears well designed to cope with changes in bed length caused by limb movements.Relevance

These results will provide baseline data that can be used to examine entrapment neuropathies.