18 May 2026
: Case report 
Total Knee Arthroplasty for Secondary Osteoarthritis in Patients With Multiple Hereditary Exostoses: A Case Series
Unusual or unexpected effect of treatment, Rare disease
Mitsuyuki Kenai ABCDEF 1, Naoki Nakano ABCDEF 1*, Masanori Tsubosaka ABCDEF 1, Tomoyuki Kamenaga ABCDEF 1, Yuichi Kuroda
ABCDEF 1, Shinya Hayashi ABCDEF 1, Ryosuke Kuroda ABCDEF 1, Tomoyuki Matsumoto ABCDEF 1
DOI: 10.12659/AJCR.952617
Am J Case Rep 2026; 27:e952617
Table 1 Summary of 4 cases.
| Case | Preoperative ROM/ alignment (HKA) | Postoperative ROM/ alignment (HKA) | Insert | Comments |
|---|---|---|---|---|
| Case 1 | −10° to 100°/24° valgus | −5° to 120°/4° valgus | CPS | A CPS insert was used due to residual instability |
| Case 2 | −5° to 95°/11° valgus | 0° to 100°−3° valgus | CPS | Navigation used due to retained femoral hardware |
| Case 3 | −30° to 80°/12°varus | −15° to110°/0° | PS | |
| Case 4 | −5° to 95°/17° varus | 0° to 100°/2° varus | PS |