Our group was trying to compare the range of motion (ROM) between bowstrokes from two different cello setups. A poor range of motion is a common factor leading to overuse injuries, such as tendinitis, tenosynovitis, and Carpal Tunnel Syndrome. We were interested in the hypothesis that stated there was a greater range of motion in a cello with a bent endpin. The analysis showed advantages in joint-specific areas regarding ROM in both cellos. Although the bent endpin cello facilitated a greater range of motion in the elbow, the straight endpin cello had a greater upper arm ROM. The bent endpin cello had better radial deviation, while the straight endpin cello had better ulnar deviation. Tighter coordination was found in the straight endpin cello. In contrast, the bent endpin cello displayed some decoupled coordination. The center of mass was identical in both setups. Based on the mixed results, we felt that the findings were inconclusive.
Although every individual has his or her own preferences, both setups obviously have something to offer. According to Zaza (1998), the excess tension experienced from playing-related musculoskeletal disorders (PRMDs) will lead to disabling overuse injuries that can jeopardize a musicians career. One way cellists might avoid these PRMDs would be to toy with the idea of a rotation system between the two endpins. Stress-concentrated areas affected by using one setup will get some time to rest while areas more affected by the other endpin setup would be utilized. Consequently, this lowers the overall level of cumulative trauma sustained by key muscles, tendons, and joints.
A major limitation to this study was the fact that only one subject was used. In order to obtain more accurate results, numerous subjects would have to be tested. Of these subjects, both genders and various heights need to be considered. The range of motion would surely be different in each individual. Also, more joints and body segments should be included to ensure a precise measurement. The opposite arm and legs should be taken into account when studying the range of motion. A performance measure (sound quality) should be evident, as it is a crucial tool in comparing the two setups. The most difficult barrier we encountered involved the lack of resources concerning the topic, and the lack of interest in the general community. As Performing Arts Medicine is still a fledgling field, the information present was somewhat limited in helping us with the analysis.
James, I.M. and Parry, W.C.B. (1994) Repetitive Strain Injury. British Medical Journal 308: 270.
Zaza, C. (1998) Playing-related musculoskeletal disorders in musicians: a systematic review of incidence and prevalence. Canadian Medical Association Journal 158: 1019-1025.