In one of the largest retrospective studies of 39 patients (43 elbows) in whom HO was treated with excision, overall mean flexion-extension
arc of motion was improved from 35[degrees] to 103[degrees] at an average of 13 months follow-up (8).
At a mean follow-up of 26 months, the final
arc of motion in the entire cohort was 88.9[degrees] (range, 30[degrees]-110[degrees]), and 11 patients (58%) had good-excellent results.
With regard to angle of the
arc of motion, there was statistically significant differences identified in both contact area and peak contact pressure throughout the
arc of motion and also between multiple positions with respect to full extension.
The adjustment was especially important because the nonsurgical group had better function at baseline, with significantly stronger grip and pinch strength, better Michigan Hand Questionnaire (MHQ) scores, and significantly better ulnar drift, extensor lag, and
arc of motion than did the surgical group (Arthritis Care Res.
(3) Neer's and Hawkin's tests are often positive, and there may be pain with the
arc of motion. (For more on these and the other tests mentioned here, see Athlete has shoulder problems?
Knee flexion was 90-100 degrees;
arc of motion was 80-90 degrees.
Initially, investigators attributed the change in
arc of motion to soft tissue adaptations, including stretching of the anterior capsular structures, with a corresponding tightening of the posterior capsule (Burkhart et al., 2003c; Burkhart et al., 2003a; Myers et al., 2006; Verna, 1991).
A new suspension system incorporates an Automatic Compensation System (ACS) that permits a full 210 degree
arc of motion. A flat screen or CRT monitor can be mounted from the system.
The original pusher arm system relied upon limit switches and cams to control the
arc of motion of each arm.
The
arc of motion for small joints is so intricate that I don't think it can be replaced.
To obtain a concentric joint reduction and a stable
arc of motion, restoration of the osseous stabilizers is a crucial part of the operation when the concomitant fractures were present.