Changes in Knee Extension and Flexion Muscle Strength Measured by an Isokinetic Dynamometer after High Tibial Osteotomy: Comparison of Hybrid Closed Wedge HTO and Medial Open Wedge HTO

• Published in: Rigaku ryoho kagaku Vol. 40; no. 1; pp. 15 - 19
• Main Authors: OKAMOTO, Michio, OGAWA, Takuya, KONDO, Shusuke, YAMADA, Yuzo
• Format: Journal Article
• Language: English; Japanese
• Published: Tokyo The Society of Physical Therapy Science 2025; 理学療法科学学会; Japan Science and Technology Agency
• Subjects: Clinical outcomes; H/Q ratio; H/Q比; high tibial osteotomy; isokinetic muscle strength; Muscle strength; 等速性筋力; 高位脛骨骨切り術
• ISSN: 1341-1667; 2434-2807
• DOI: 10.1589/rika.40.15

[Purpose] We evaluated the isokinetic knee muscle strength, from before surgery to 6 months after surgery, for both hybrid closed wedge high tibial osteotomy (HCWHTO) and medial open wedge high tibial osteotomy (MOWHTO). [Participants and Methods] This study included 21 patients with HCWHTO and 26 patients with MOWHTO. The maximum torque-to-body weight ratio (%BW) and H/Q ratio were measured preoperatively, and at 3 and 6 months postoperatively. [Results] In HCWHTO, the knee flexion muscle strength significantly increased from pre- to 3 months post-operatively (p＜0.05). Knee extension muscle strength in MOWHTO significantly increased from pre- to 3 months post-operatively (p＜0.05). There were no significant differences in the H/Q ratio over time or between surgical procedures. [Conclusion] We consider that the difference in the timing of the start of post-operative loading between surgical procedures may have affected the course of muscle strength recovery. In order to improve clinical outcomes after HTO, strengthening the quadriceps muscle and reducing the H/Q ratio is considered important.