المؤلفون: Shane J. Nho, Jeffrey S. Grzybowski, Thomas H. Wuerz, Michael J. Salata, Alejandro A. Espinoza Orías, Hal David Martin, Richard C. Mather, Sang H. Song

المصدر: Arthroscopy: The Journal of Arthroscopic & Related Surgery. 32:1571-1580

مصطلحات موضوعية: Adult, Joint Instability, Male, musculoskeletal diseases, medicine.medical_specialty, Rotation, medicine.medical_treatment, Joint stability, Joint Capsule Release, 03 medical and health sciences, Postoperative Complications, 0302 clinical medicine, Cadaver, medicine, Humans, Orthopedics and Sports Medicine, Range of Motion, Articular, Aged, Aged, 80 and over, 030222 orthopedics, business.industry, Neutral zone, Soft tissue, 030229 sport sciences, Middle Aged, Biomechanical Phenomena, Surgery, Capsulotomy, Female, Hip Joint, Cadaveric spasm, Range of motion, business, Nuclear medicine

الوصف: To evaluate the effect of capsulotomy size and subsequent repair on the biomechanical stability of hip joint kinematics through external rotation of a cadaveric hip in neutral flexion.Eight fresh-frozen cadaveric hip specimens were used in this study. Each hip was tested under torsional loads of 6 N·m applied by a servohydraulic frame and transmitted by a pulley system. The test conditions were (1) neutral flexion with the capsule intact, (2) neutral flexion with a 4-cm interportal capsulotomy, (3) neutral flexion with a 6-cm capsulotomy, and (4) neutral flexion with capsulotomy repair. Soft tissue was retained during all interventions. Measures indicating joint kinematics (range of motion [ROM], hysteresis area [HA], and neutral zone [NZ]) were obtained for each condition.For all hip specimens, the average ROM, HA, and NZ were calculated relative to the intact capsular state (100%) and expressed in terms of percentage (± SD). The findings for ROM were as follows: intact, 100%; 4 cm, 107.42% ± 5.69%; 6 cm, 113.40% ± 7.92%; and repair, 99.78% ± 3.77%. The findings for HA were as follows: intact, 100%; 4 cm, 108.30% ± 9.30%; 6 cm, 115.30% ± 13.92%; and repair, 99.47% ± 4.12%. The findings for NZ were as follows: intact, 100%; 4 cm, 139.61% ± 62.35%; 6 cm, 169.25% ± 78.19%; and repair, 132.03% ± 64.38%. Statistically significant differences in ROM existed between the intact and 4-cm conditions (P = .039), the intact and 6-cm conditions (P.0001), the 4-cm and repair conditions (P = .033), and the 6-cm and repair conditions (P.0001). There was no statistically significant difference between the intact and repair conditions (P.99) or between the 4- and 6-cm conditions (P = .126).Under laboratory-based conditions, larger-sized capsulotomies were accompanied by increases in all 3 measures of joint mobility: ROM, HA, and NZ at time zero. Complete capsular closure effectively restored these measures when compared with the intact condition.Cadaveric models consisting of the hip joint with surrounding soft tissue were used under laboratory testing conditions to investigate potential iatrogenic joint instability resulting from expansive capsulotomies, showing that complete capsular closure leads to reconstitution of original joint stability properties at time zero.

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1d51555716688ebbdc596747c3c6fc1a
https://doi.org/10.1016/j.arthro.2016.01.049